Document and Entity Information - USD ($) $ in Millions	12 Months Ended
Document and Entity Information - USD ($) $ in Millions	Dec. 31, 2019	Feb. 07, 2020	Jun. 29, 2019
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Entity Registrant Name	DUCOMMUN INC /DE/
Entity Central Index Key	0000030305
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Interactive Data Current	Yes
Entity Common Stock, Shares Outstanding		11,606,827
Entity Public Float			$ 519

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents	$ 39,584	$ 10,263
Accounts receivable (net of allowance for doubtful accounts of $1,321 and $1,135 at December 31, 2019 and 2018, respectively)	67,133	67,819
Contract assets	106,670	86,665
Inventories	112,482	101,125
Production cost of contracts	9,402	11,679
Other current assets	5,497	6,531
Total Current Assets	340,768	284,082
Property and Equipment, Net	115,216	107,045
Operating lease right-of-use assets	19,105	0
Goodwill	170,917	136,057
Intangibles, Net	138,362	112,092
Non-Current Deferred Income Taxes	55	308
Other Assets	6,006	5,155
Total Assets	790,429	644,739
Current Liabilities
Accounts payable	82,597	69,274
Contract liabilities	14,517	17,145
Accrued liabilities	37,620	37,786
Operating lease liabilities	2,956	0
Current portion of long-term debt	7,000	2,330
Total Current Liabilities	144,690	126,535
Long-Term Debt, Less Current Portion	300,887	228,868
Non-Current Operating Lease Liabilities	17,565	0
Non-Current Deferred Income Taxes	16,766	18,070
Other Long-Term Liabilities	17,721	14,441
Total Liabilities	497,629	387,914
Commitments and Contingencies (Notes 13, 15)
Shareholders’ Equity
Common stock - $0.01 par value; 35,000,000 shares authorized; 11,572,668 and 11,417,863 shares issued and outstanding at December 31, 2019 and 2018, respectively	116	114
Additional paid-in capital	88,399	83,712
Retained earnings	212,553	180,356
Accumulated other comprehensive loss	(8,268)	(7,357)
Total Shareholders’ Equity	292,800	256,825
Total Liabilities and Shareholders’ Equity	$ 790,429	$ 644,739

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 1,321	$ 1,135
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	35,000,000	35,000,000
Common stock, shares issued (in shares)	11,572,668	11,417,863
Common Stock, shares outstanding (in shares)	11,572,668	11,417,863

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Net Revenues	$ 721,088	$ 629,307	$ 558,183
Cost of Sales	568,891	506,711	455,050
Gross Profit	152,197	122,596	103,133
Selling, General and Administrative Expenses	95,964	84,007	79,139
Restructuring Charges	0	14,671	8,360
Operating Income	56,233	23,918	15,634
Interest Expense	(18,290)	(13,024)	(8,870)
Loss on Extinguishment of Debt	(180)	(926)	0
Other Income, Net	0	303	845
Income Before Taxes	37,763	10,271	7,609
Income Tax Expense (Benefit)	5,302	1,236	(12,468)
Net Income	$ 32,461	$ 9,035	$ 20,077
Earnings Per Share
Basic earnings (loss) per share (in dollars per share)	$ 2.82	$ 0.79	$ 1.78
Diluted earnings (loss) per share (in dollars per share)	$ 2.75	$ 0.77	$ 1.74
Weighted-Average Number of Shares Outstanding
Basic (in shares)	11,518	11,390	11,290
Diluted (in shares)	11,792	11,659	11,558

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net Income	$ 32,461	$ 9,035	$ 20,077
Pension Adjustments:
Amortization of actuarial losses and prior service costs, net of tax of $209, $173, and $302 for 2019, 2018, and 2017, respectively	676	570	508
Actuarial losses arising during the period, net of tax benefit of $502, $302, and $194 for 2019, 2018, and 2017, respectively	(1,682)	(899)	(304)
Change in net unrealized gains (losses) on cash flow hedges, net of tax expense (benefit) of $29, $121, and $(145) for 2019, 2018, and 2017, respectively	95
Change in net unrealized gains (losses) on cash flow hedges, net of tax expense (benefit) of $29, $121, and $(145) for 2019, 2018, and 2017, respectively		407	(242)
Other Comprehensive (Loss) Income, Net of Tax	(911)	78	(38)
Comprehensive Income, Net of Tax	$ 31,550	$ 9,113	$ 20,039

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Amortization of actuarial (loss) gain, tax	$ 209	$ 173	$ 302
Actuarial gain (loss) arising during the period, tax expense (benefit)	502	302	194
Unrealized gain (loss) on cash flow hedge, tax	$ 29
Unrealized gain (loss) on cash flow hedges, tax		$ 121	$ (145)

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance (in shares) at Dec. 31, 2016		11,193,813
Beginning Balance at Dec. 31, 2016	$ 212,103	$ 112	$ 0	$ 76,783	$ 141,287	$ (6,079)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	20,077				20,077
Other comprehensive income (loss), net of tax	(38)					(38)
Exercised (in shares)		212,775
Stock options exercised	4,336	$ 2		4,334
Stock repurchased related to the exercise of stock options (in shares)		(219,164)
Stock repurchased related to the exercise of stock options	(6,904)	$ (2)		(6,902)
Stock awards vested (in shares)		145,417
Stock awards vested	0	$ 1		(1)
Stock-based compensation	6,009			6,009
Ending Balance (in shares) at Dec. 31, 2017		11,332,841
Ending Balance at Dec. 31, 2017	235,583	$ 113	0	80,223	161,364	(6,117)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	9,035				9,035
Other comprehensive income (loss), net of tax	78					78
Adoption of ASU 2018-02 adjustment	(26)				1,292	(1,318)
Exercised (in shares)		84,800
Stock options exercised	1,822	$ 1		1,821
Stock repurchased related to the exercise of stock options (in shares)		(98,438)
Stock repurchased related to the exercise of stock options	(3,372)	$ (1)		(3,371)
Stock awards vested (in shares)		98,660
Stock awards vested	0	$ 1		(1)
Stock-based compensation	5,040			5,040
Ending Balance (in shares) at Dec. 31, 2018		11,417,863
Ending Balance at Dec. 31, 2018	256,825	$ 114	0	83,712	180,356	(7,357)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	32,461
Other comprehensive income (loss), net of tax	(911)					(911)
Employee stock purchase plan (in shares)		26,521
Employee stock purchase plan	$ 1,118			1,118
Exercised (in shares)	80,693	80,693
Stock options exercised	$ 2,015	$ 1		2,014
Stock repurchased related to the exercise of stock options (in shares)		(123,192)
Stock repurchased related to the exercise of stock options	(5,605)	$ (1)		(5,604)
Stock awards vested (in shares)		170,783
Stock awards vested	0	$ 2		(2)
Stock-based compensation	7,161			7,161
Ending Balance (in shares) at Dec. 31, 2019		11,572,668
Ending Balance at Dec. 31, 2019	$ 292,800	$ 116	$ 0	$ 88,399	$ 212,553	$ (8,268)

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows from Operating Activities
Net Income	$ 32,461	$ 9,035	$ 20,077
Adjustments to Reconcile Net Income (Loss) to Net Cash Provided by Operating Activities
Depreciation and amortization	28,305	25,296	22,845
Non-cash operating lease cost	2,669	0	0
Property and equipment impairment due to restructuring	0	6,207	3,607
Stock-based compensation expense	7,161	5,040	4,675
Deferred income taxes	(1,830)	2,042	(15,411)
Provision for doubtful accounts	186	267	373
Noncash loss on extinguishment of debt	180	926	0
Other	942	11,659	(1,182)
Changes in Assets and Liabilities:
Accounts receivable	2,380	7,495	2,720
Contract assets	(20,005)	(86,665)	0
Inventories	(8,491)	23,243	(533)
Production cost of contracts	(1,079)	(1,569)	(267)
Other assets	1,358	1,881	40
Accounts payable	11,620	18,496	(4,015)
Contract liabilities	(2,628)	17,145	0
Accrued and other liabilities	(2,198)	5,739	2,505
Net Cash Provided by Operating Activities	51,031	46,237	35,434
Cash Flows from Investing Activities
Purchases of property and equipment	(18,290)	(17,617)	(27,610)
Proceeds from sale of assets	3	396	913
Insurance recoveries related to property and equipment	0	0	288
Payments for acquisition of Lightning Diversion Systems, LLC, net of cash acquired	0	0	(59,798)
Payments for acquisition of Certified Thermoplastics Co., LLC, net of cash acquired	0	(30,712)	0
Payments for acquisition of Nobles Worldwide, Inc. net of cash acquired	(76,647)	0	0
Net Cash Used in Investing Activities	(94,934)	(47,933)	(86,207)
Cash Flows from Financing Activities
Borrowings from senior secured revolving credit facility	298,400	296,400	395,900
Repayment of senior secured revolving credit facility	(298,400)	(354,500)	(337,800)
Borrowings from term loans	140,000	240,000	0
Repayments of term loans	(63,000)	(167,000)	(10,000)
Repayments of other debt	(169)	0	(3)
Debt issuance costs	(1,135)	(3,541)	0
Net cash paid from issuance of common stock under stock plans	(2,472)	(1,550)	(2,606)
Net Cash Provided by Financing Activities	73,224	9,809	45,491
Net Increase (Decrease) in Cash and Cash Equivalents	29,321	8,113	(5,282)
Cash and Cash Equivalents at Beginning of Year	10,263	2,150	7,432
Cash and Cash Equivalents at End of Year	$ 39,584	$ 10,263	$ 2,150

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Description of Business

We are a leading global provider of engineering and manufacturing services for high-performance products and high-cost-of failure applications used primarily in the aerospace and defense (“A&D”), industrial, medical, and other industries (collectively, “Industrial”). Our operations are organized into two primary businesses: Electronic Systems segment and Structural Systems segment, each of which is a reportable operating segment. Electronic Systems designs, engineers and manufactures high-reliability electronic and electromechanical products used in worldwide technology-driven markets including A&D and Industrial end-use markets. Electronic Systems’ product offerings primarily range from prototype development to complex assemblies. Structural Systems designs, engineers and manufactures large, complex contoured aerostructure components and assemblies and supplies composite and metal bonded structures and assemblies. Structural Systems’ products are primarily used on commercial aircraft, military fixed-wing aircraft and military and commercial rotary-wing aircraft. All reportable operating segments follow the same accounting principles.

Basis of Presentation

The consolidated financial statements include the accounts of Ducommun Incorporated and its subsidiaries (“Ducommun,” the “Company,” “we,” “us” or “our”), after eliminating intercompany balances and transactions.

In the opinion of management, all adjustments, consisting of recurring accruals, have been made that are necessary to fairly present our consolidated financial position, statements of income, comprehensive income, and cash flows in accordance with accounting principles generally accepted in the United States of America (“GAAP”).

Our fiscal quarters typically end on the Saturday closest to the end of March, June and September for the first three fiscal quarters of each year, and ends on December 31 for our fourth fiscal quarter. As a result of using fiscal quarters for the first three quarters combined with leap years, our first and fourth fiscal quarters can range between 12 1/2 weeks to 13 1/2 weeks while the second and third fiscal quarters remain at a constant 13 weeks per fiscal quarter.

Changes in Accounting Policies

We adopted Accounting Standards Codification (“ASC”) 842, “Leases” (“ASC 842”), on January 1, 2019. As a result, we changed our accounting policy for lease accounting as discussed in Note 2.

We applied ASC 842 using the additional transition method and therefore, recognized the cumulative effect of initially applying ASC 842 as an adjustment to the opening consolidated balance sheet at January 1, 2019. Therefore, the comparative information has not been adjusted and continues to be reported under the previous lease accounting standard, ASC 840, “Leases” (“ASC 840”). The details of the significant changes and quantitative impact of the changes are described in Note 2.

We adopted ASC 606, “Revenue from Contracts with Customers” (“ASC 606”), on January 1, 2018. As a result, we changed our accounting policy for revenue recognition and the majority of our revenues began being recognized over time. The majority of our inventory began being charged to cost of sales as raw materials are placed into production and the related revenue is recognized. Revenues recognized before billing are classified as contract assets. Payments received from customers prior to our billing are classified as contract liabilities. The determination of our provision for estimated losses on contracts was also changed as the definition of a contract for us became the customer purchase order instead of the long-term arrangements and are classified as contract liabilities.

We applied ASC 606 using the modified retrospective method (also known as the cumulative effect method) and as such, recognized the cumulative effect of initially applying ASC 606 as an adjustment to the opening consolidated balance sheet at January 1, 2018. Therefore, the comparative information has not been adjusted and continues to be reported under the previous revenue recognition accounting standard, ASC 605, “Revenue Recognition” (“ASC 605”).

Use of Estimates

Certain amounts and disclosures included in the consolidated financial statements required management to make estimates and judgments that affect the amount of assets, liabilities (including forward loss reserves), revenues and expenses, and related disclosures of contingent assets and liabilities. These estimates are based on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Actual results could differ from these estimates.

Reclassifications

Certain prior period amounts have been reclassified to conform to current year’s presentation.

Supplemental Cash Flow Information



	(Dollars in thousands) Years Ended December 31,
	2019		2018		2017
Interest paid	$	16,474	$	11,573	$	7,307
Taxes paid	$	5,699	$	316	$	3,125
Non-cash activities:
Purchases of property and equipment not paid	$	1,380	$	824	$	2,104

Fair Value

Assets and liabilities that are measured, recorded or disclosed at fair value on a recurring basis are categorized using the fair value hierarchy. The fair value hierarchy has three levels based on the reliability of the inputs used to determine the fair value. Level 1, the highest level, refers to the values determined based on quoted prices in active markets for identical assets. Level 2 refers to fair values estimated using significant observable inputs. Level 3, the lowest level, includes fair values estimated using significant unobservable inputs.

We have money market funds and they are included as cash and cash equivalents. We also have interest rate cap hedge agreements and the fair value of the interest rate cap hedge agreements were determined using pricing models that use observable market inputs as of the balance sheet date, a Level 2 measurement. The interest rate cap hedge premium was zero as of December 31, 2019.

There were no transfers between Level 1, Level 2, or Level 3 financial instruments in either 2019 or 2018.

Cash Equivalents

Cash equivalents consist of highly liquid instruments purchased with original maturities of three months or less. These assets are valued at cost, which approximates fair value, which we classify as Level 1. See Fair Value above.

Derivative Instruments

We recognize derivative instruments on our consolidated balance sheets at their fair value. On the date that we enter into a derivative contract, we designate the derivative instrument as a fair value hedge, a cash flow hedge, a hedge of a net investment in a foreign operation, or a derivative instrument that will not be accounted for using hedge accounting methods. As of December 31, 2019 and December 31, 2018, all of our derivative instruments were designated as cash flow hedges.

We record changes in the fair value of a derivative instrument that is highly effective and that is designated and qualifies as a cash flow hedge in other comprehensive income (loss), net of tax until our earnings are affected by the variability of cash flows of the underlying hedge. We record any hedge ineffectiveness and amounts excluded from effectiveness testing in current period earnings within interest expense. We report changes in the fair values of derivative instruments that are not designated or do not qualify for hedge accounting in current period earnings. We classify cash flows from derivative instruments in the consolidated statements of cash flows in the same category as the item being hedged or on a basis consistent with the nature of the instrument. In 2019, the impact of cash flow hedges was insignificant.

When we determine that a derivative instrument is not highly effective as a hedge, we discontinue hedge accounting prospectively. In all situations in which we discontinue hedge accounting and the derivative instrument remains outstanding, we will carry the derivative instrument at its fair value on our consolidated balance sheets and recognize subsequent changes in its fair value in our current period earnings.

Allowance for Doubtful Accounts

We maintain an allowance for doubtful accounts for estimated losses from the inability of customers to make required payments. The allowance for doubtful accounts is evaluated periodically based on the aging of accounts receivable, the financial condition of customers and their payment history, historical write-off experience and other assumptions, such as current assessment of economic conditions.

Inventories

Inventories are stated at the lower of cost or net realizable value with cost being determined using a moving average cost basis for raw materials and actual cost for work-in-process and finished goods. The majority of our inventory is charged to cost of sales as raw materials are placed into production and the related revenue is recognized. Inventoried costs include raw materials, outside processing, direct labor and allocated overhead, adjusted for any abnormal amounts of idle performance center expense, freight, handling costs, and wasted materials (spoilage) incurred. We assess the inventory carrying value and reduce it, if necessary, to its net realizable value based on customer orders on hand, and internal demand forecasts using management’s best estimates given information currently available. The majority of our revenues are recognized over time, however, for revenue contracts where revenue is recognized using the point in time method, inventory is not reduced until it is shipped or transfer of control to the customer has occurred. Our ending inventory consists of raw materials, work-in-process, and finished goods.

Production Cost of Contracts

Production cost of contracts includes non-recurring production costs, such as design and engineering costs, and tooling and other special-purpose machinery necessary to build parts as specified in a contract. Production costs of contracts are recorded to cost of sales using the over time revenue recognition model. We review the value of the production cost of contracts on a quarterly basis to ensure when added to the estimated cost to complete, the value is not greater than the estimated realizable value of the related contracts. As of December 31, 2019 and 2018, production costs of contracts were $9.4 million and $11.7 million, respectively.

Property and Equipment and Depreciation

Property and equipment, including assets recorded under operating and finance leases, are recorded at cost. Depreciation and amortization are computed using the straight-line method over the estimated useful lives of the related assets, or the lease term if shorter for leasehold improvements. Repairs and maintenance are charged to expense as incurred. We evaluate long-lived assets for recoverability considering undiscounted cash flows, when significant changes in conditions occur, and recognize impairment losses if any, based upon the fair value of the assets.

Goodwill

Goodwill is evaluated for impairment on an annual basis on the first day of the fourth fiscal quarter. If certain factors occur, including significant under performance of our business relative to expected operating results, significant adverse economic and industry trends, significant decline in our market capitalization for an extended period of time relative to net book value, a decision to divest individual businesses within a reporting unit, or a decision to group individual businesses differently, we may perform an impairment test prior to the fourth quarter. In addition, we early adopted ASU 2017-04 on January 1, 2019 which simplified our goodwill impairment testing by eliminating Step Two of the goodwill impairment test. See Note 1.

We acquired Certified Thermoplastics Co., LLC (“CTP”) in April 2018 and recorded goodwill of $18.6 million in our Structural Systems segment, which is also our reporting unit. Since a goodwill impairment analysis is required to be performed within one year of the acquisition date or sooner upon a triggering event, we performed a Step One goodwill impairment analysis as of April 2019 for our Structural Systems segment. The fair value of our Structural Systems segment exceeded its carrying value by 85% and thus, was not deemed impaired.

In the fourth quarter of 2019, the carrying amount of goodwill at the date of the most recent annual impairment evaluation for Electronic Systems and Structural Systems was $117.4 million and $18.6 million, respectively. As of the date of our 2019 annual evaluation for goodwill impairment, for the Electronic Systems segment, which is also our reporting unit, we elected to perform a Step One goodwill impairment analysis and will continue to do so from time to time. The fair value of our Electronic Systems segment exceeded its carrying value by 44% and thus, was not deemed impaired.

As of the date of our 2019 annual evaluation for goodwill impairment, for the Structural Systems segment, we used a qualitative assessment including 1) margin of passing most recent step 1 analysis, 2) earnings before interest, taxes, depreciation, and amortization, 3) long-term growth rate, 4) analyzing material adverse factors/changes between valuation dates, 5) general macroeconomic factors, and 6) industry and market conditions, noting it was not more likely than not that the fair value of a reporting unit is less than its carrying amount and thus, goodwill was not deemed impaired.

Other Intangible Assets

We amortize acquired other intangible assets with finite lives over the estimated economic lives of the assets, ranging from 10 to 18 years generally using the straight-line method. The value of other intangibles acquired through business combinations has been estimated using present value techniques which involve estimates of future cash flows. We evaluate other intangible assets for recoverability considering undiscounted cash flows, when significant changes in conditions occur, and recognize impairment losses, if any, based upon the estimated fair value of the assets.

Accumulated Other Comprehensive Loss

Accumulated other comprehensive loss, as reflected on the consolidated balance sheets under the equity section, was comprised of cumulative pension and retirement liability adjustments, net of tax, and change in net unrealized gains and losses on cash flow hedges, net of tax.

Revenue Recognition

Our customers typically engage us to manufacture products based on designs and specifications provided by the end-use customer. This requires the building of tooling and manufacturing first article inspection products (prototypes) before volume manufacturing. Contracts with our customers generally include a termination for convenience clause.

We have a significant number of contracts that are started and completed within the same year, as well as contracts derived from long-term agreements and programs that can span several years. We recognize revenue under ASC 606, which utilizes a five-step model.

The definition of a contract for us is typically defined as a customer purchase order as this is when we achieve an enforceable right to payment. The majority of our contracts are firm fixed-price contracts. The deliverables within a customer purchase order are analyzed to determine the number of performance obligations. In addition, at times, in order to achieve economies of scale and based on our customer’s forecasted demand, we may build in advance of receiving a purchase order from our customer. When that occurs, we would not recognize revenue until we have received the customer purchase order.

A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account under ASC 606. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, control is transferred and the performance obligation is satisfied. The majority of our contracts have a single performance obligation as the promise to transfer the individual goods or services are highly interrelated or met the series guidance. For contracts with multiple performance obligations, we allocate the contract transaction price to each performance obligation using our best estimate of the standalone selling price of each distinct good or service in the contract. The primary method used to estimate the standalone selling price is the expected cost plus a margin approach, under which we forecast our expected costs of satisfying a performance obligation and then add an appropriate margin for that distinct good or service.

We manufacture most products to customer specifications and the product cannot be easily modified for another customer. As such, these products are deemed to have no alternative use once the manufacturing process begins. In the event the customer invokes a termination for convenience clause, we would be entitled to costs incurred to date plus a reasonable profit. Contract costs typically include labor, materials, overhead, and when applicable, subcontractor costs. For most of our products, we are building assets with no alternative use and have enforceable right to payment, and thus, we recognize revenue using the over time method.

The majority of our performance obligations are satisfied over time as work progresses. Typically, revenue is recognized over time using an input measure (i.e., costs incurred to date relative to total estimated costs at completion, also known as cost-to-cost plus reasonable profit) to measure progress. Our typical revenue contract is a firm fixed price contract, and the cost of raw materials could make up a significant amount of the total costs incurred. As such, we believe using the total costs incurred input method would be the most appropriate method. While the cost of raw materials could make up a significant amount of the total costs incurred, there is a direct relationship between our inputs and the transfer of control of goods or services to the customer.

Contract estimates are based on various assumptions to project the outcome of future events that can span multiple months or years. These assumptions include labor productivity and availability; the complexity of the work to be performed; the cost and availability of materials; and the performance of subcontractors.

As a significant change in one or more of these estimates could affect the profitability of our contracts, we review and update our contract-related estimates on a regular basis. We recognize adjustments in estimated profit on contracts under the cumulative catch-up method. Under this method, the impact of the adjustment on profit recorded to date is recognized in the period the adjustment is identified. Revenue and profit in future periods of contract performance is recognized using the adjusted estimate. If at any time the estimate of contract profitability indicates an anticipated loss on the contract, we recognize the total loss in the quarter it is identified.

The impact of adjustments in contract estimates on our operating earnings can be reflected in either operating costs and expenses or revenue.

Net cumulative catch-up adjustments on profit recorded were not material for the year ended December 31, 2019.

Payments under long-term contracts may be received before or after revenue is recognized. When revenue is recognized before we bill our customer, a contract asset is created for the work performed but not yet billed. Similarly, when we receive payment before we ship our products to our customer, a contract liability is created for the advance or progress payment.

Contract Assets and Contract Liabilities

Contract assets consist of our right to payment for work performed but not yet billed. Contract assets are transferred to accounts receivable when we bill our customers. We bill our customers when we ship the products and meet the shipping terms within the revenue contract. Contract liabilities consist of advance or progress payments received from our customers prior to the time transfer of control occurs plus the estimated losses on contracts.

Contract assets and contract liabilities from revenue contracts with customers are as follows:



	(Dollars in thousands)
	December 31, 2019		December 31, 2018
Contract assets	$	106,670	$	86,665
Contract liabilities	$	14,517	$	17,145

Remaining performance obligations is defined as customer placed purchase orders (“POs”) with firm fixed price and firm delivery dates. Our remaining performance obligations as of December 31, 2019 totaled $745.3 million. We anticipate recognizing an estimated 65% of our remaining performance obligations as revenue during the next 12 months with the remaining performance obligations being recognized in 2021 and beyond.

Revenue by Category

In addition to the revenue categories disclosed above, the following table reflects our revenue disaggregated by major end-use market:



				(Dollars in thousands) Years Ended December 31,				% of Net Revenues
	Change			2019		2018		2019		2018
Consolidated Ducommun
Military and space	$	46,208		$	323,800	$	277,592	44.9	%	44.1	%
Commercial aerospace	44,981			348,503		303,522		48.3	%	48.2	%
Industrial	592			48,785		48,193		6.8	%	7.7	%
Total	$	91,781		$	721,088	$	629,307	100.0	%	100.0	%

Electronic Systems
Military and space	$	28,526		$	244,245	$	215,719	67.8	%	63.8	%
Commercial aerospace	(6,613		)	67,343		73,956		18.7	%	21.9	%
Industrial	592			48,785		48,193		13.5	%	14.3	%
Total	$	22,505		$	360,373	$	337,868	100.0	%	100.0	%

Structural Systems
Military and space	$	17,682		$	79,555	$	61,873	22.1	%	21.2	%
Commercial aerospace	51,594			281,160		229,566		77.9	%	78.8	%
Total	$	69,276		$	360,715	$	291,439	100.0	%	100.0	%

Provision for Estimated Losses on Contracts

We record provisions for the total anticipated losses on contracts, considering total estimated costs to complete the contract compared to total anticipated revenues, in the period in which such losses are identified. The provisions for estimated losses on contracts require us to make certain estimates and assumptions, including those with respect to the future revenue under a contract and the future cost to complete the contract. Our estimate of the future cost to complete a contract may include assumptions as to changes in manufacturing efficiency, operating and material costs, and our ability to resolve claims and assertions with our customers. If any of these or other assumptions and estimates do not materialize in the future, we may be required to adjust the provisions for estimated losses on contracts. The provision for estimated losses on contracts is included as part of contract liabilities on the consolidated balance sheets. As of December 31, 2019 and 2018, provision for estimated losses on contracts were $4.2 million and $5.3 million, respectively.

Income Taxes

Income taxes are accounted for using an asset and liability approach that requires the recognition of deferred tax assets and liabilities. Deferred tax assets and liabilities are recognized, using enacted tax rates, for the expected future tax consequences of temporary differences between the book and tax bases of recorded assets and liabilities, operating losses, and tax credit carryforwards. Deferred tax assets are evaluated quarterly and are reduced by a valuation allowance if it is more likely than not that some portion or all of the deferred tax assets will not be realized.

Tax positions taken or expected to be taken in a tax return are recognized when it is more-likely-than-not, based on technical merits, to be sustained upon examination by taxing authorities. The amount recognized is measured as the largest amount of benefit that is greater than 50% likely of being realized upon ultimate settlement, including resolution of related appeals and/or litigation process, if any.

Litigation and Commitments

In the normal course of business, we are defendants in certain litigation, claims and inquiries, including matters relating to environmental laws. In addition, we make various commitments and incur contingent liabilities. Management’s estimates regarding contingent liabilities could differ from actual results.

Environmental Liabilities

Environmental liabilities are recorded when environmental assessments and/or remedial efforts are probable and costs can be reasonably estimated. Generally, the timing of these accruals coincides with the completion of a feasibility study or our commitment to a formal plan of action. Further, we review and update our environmental accruals as circumstances change and/or additional information is obtained that reasonably could be expected to have a meaningful effect on the outcome of a matter or the estimated cost thereof.

Accounting for Stock-Based Compensation

We measure and recognize compensation expense for share-based payment transactions to our employees and non-employees at their estimated fair value. The expense is measured at the grant date, based on the calculated fair value of the share-based award, and is recognized over the requisite service period (generally the vesting period of the equity award). The fair value of stock options are determined using the Black-Scholes-Merton (“Black-Scholes”) valuation model, which requires assumptions and judgments regarding stock price volatility, risk-free interest rates, and expected options terms. Management’s estimates could differ from actual results. The fair value of unvested stock awards is determined based on the closing price of the underlying common stock on the date of grant except for market condition awards for which the fair value was based on a Monte Carlo simulation model.

Earnings Per Share

Basic earnings per share are computed by dividing income available to common shareholders by the weighted-average number of common shares outstanding in each period. Diluted earnings per share is computed by dividing income available to common shareholders by the weighted-average number of common shares outstanding, plus potentially dilutive shares that could be issued if exercised or converted into common stock in each period.

The net income and weighted-average common shares outstanding used to compute earnings per share were as follows:



	(In thousands, except per share data) Years Ended December 31,
	2019		2018		2017
Net income	$	32,461	$	9,035	$	20,077
Weighted-average number of common shares outstanding
Basic weighted-average common shares outstanding	11,518		11,390		11,290
Dilutive potential common shares	274		269		268
Diluted weighted-average common shares outstanding	11,792		11,659		11,558
Earnings per share
Basic	$	2.82	$	0.79	$	1.78
Diluted	$	2.75	$	0.77	$	1.74

Potentially dilutive stock awards to purchase common stock, as shown below, were excluded from the computation of diluted earnings per share because their inclusion would have been anti-dilutive. However, these shares may be potentially dilutive common shares in the future.



	(In thousands) Years Ended December 31,
	2019	2018	2017
Stock options and stock units	127	208	126

Recent Accounting Pronouncements

New Accounting Guidance Adopted in 2019

In July 2019, the FASB issued ASU 2019-07, “Codification Updates to SEC Sections: Amendments to SEC Paragraphs Pursuant to SEC Final Rule Releases No. 33-10532, Disclosure Update and Simplification, and Nos. 33-10231 and 33-10442, Investment Company Reporting Modernization, and Miscellaneous Updates” (“ASU 2019-07”), which improve, update, and simplify its regulations on financial reporting and disclosure. The new guidance was effective when issued, which is our interim period ending September 28, 2019. The adoption of this standard did not have a material impact on our consolidated financial statements.

In August 2017, the FASB issued ASU 2017-12, “Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging” (“ASU 2017-12”), which intends to improve and simplify accounting rules around hedge accounting. ASU 2017-12 refines and expands hedge accounting for both financial (i.e., interest rate) and commodity risks. In addition, it creates more transparency around how economic results are presented, both on the face of the financial statements and in the footnotes. The new guidance is effective for annual periods beginning after December 15, 2018, including interim periods within those annual periods, which is our interim period beginning January 1, 2019. Early adoption is permitted, including adoption in any interim period after the issuance of ASU 2017-12. The adoption of this standard did not have a material impact on our consolidated financial statements.

In January 2017, the FASB issued ASU 2017-04, “Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment” (“ASU 2017-04”), which simplifies the subsequent measurement of goodwill, the amendments eliminate Step Two from the goodwill impairment test. The annual, or interim, goodwill impairment test is performed by comparing the fair value of a reporting unit with its carrying amount. An impairment charge should be recognized for the amount by which the carrying amount exceeds the reporting unit’s fair value; however, the loss recognized should not exceed the total amount of goodwill allocated to that reporting unit. In addition, income tax effects from any tax deductible goodwill on the carrying amount of the reporting unit should be considered when measuring the goodwill impairment loss, if applicable. The amendments also eliminate the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment and, if it fails that qualitative test, to perform Step Two of the goodwill impairment test. An entity still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. The new guidance is effective for annual or interim goodwill impairment tests in fiscal years beginning after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The adoption of this standard did not have a material impact on our consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842)” (“ASU 2016-02”), which requires lessees to present right-of-use assets and lease liabilities on the balance sheet. Lessees are required to apply a modified retrospective transition approach for leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements or the additional transition method. Under the additional transition method, the cumulative effect of applying the new guidance is recognized as an adjustment to certain captions on the balance sheet, including the opening balance of retained earnings in the first quarter of 2019, and the prior years’ financial information will be presented under the prior accounting standard, ASC 840, “Leases,” (“ASC 840”). Additional guidance was issued subsequently as follows:


•	July 2018, the FASB issued ASU 2018-11, “Leases (Topic 842): Targeted Improvements” (“ASU 2018-11”); and


•	July 2018, the FASB issued ASU 2018-10, “Codification Improvements to Topic 842, Leases” (“ASU 2018-10”)

All the new guidance was effective for us beginning January 1, 2019. The cumulative impact to our retained earnings at January 1, 2019 was a net decrease of $0.3 million. See Note 2.

Recently Issued Accounting Standards

In December 2019, the FASB issued ASU 2019-12, “Income Taxes (Topic 740), Simplifying the Accounting for Income Taxes” (“ASU 2019-12”), which removes certain exceptions and provides guidance on various areas of tax accounting. The new guidance is effective for fiscal years beginning after December 15, 2020, including interim periods within those fiscal years, which will be our interim period beginning January 1, 2021. Early adoption is permitted. We are evaluating the impact of this standard.

In April 2019, the FASB issued ASU 2019-04, “Codification Improvements to Topic 326, Financial Instruments - Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Statements” (“ASU 2019-04”), which clarify, correct, and improve various aspects of the guidance in ASU 2016-01, ASU 2016-13, and ASU 2017-12. The new guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, which will be our interim period beginning January 1, 2020. We are evaluating the impact of this standard.

In March 2019, the FASB issued ASU 2019-01, “Leases (Topic 842): Codification Improvements” (“ASU 2019-01”), which addresses various lessor implementation issues and clarifies that lessees and lessors are exempt from certain interim disclosure requirements associated with the adoption of ASC 842. The new guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, which will be our interim period beginning January 1, 2020. Early adoption is permitted. We are evaluating the impact of this standard.

In August 2018, the FASB issued ASU 2018-14, “Compensation - Retirement Benefits - Defined Benefit Plans - General (Topic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans” (“ASU 2018-14”), which will remove disclosures that no longer are considered cost-beneficial, clarify the specific requirements of disclosures, and add disclosure requirements identified as relevant. The new guidance is effective for fiscal years ending after December 15, 2020 and no amendments are made to the interim disclosure requirements. Early adoption is permitted. We are evaluating the impact of this standard.

In August 2018, the FASB issued ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement” (“ASU 2018-13”), which should improve the effectiveness of fair value measurement disclosures by removing certain requirements, modifying certain requirements, and adding certain new requirements. The new guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, which will be our interim period beginning January 1, 2020. Early adoption is permitted. We are evaluating the impact of this standard.

In June 2016, the FASB issued ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” (“ASU 2016-13”), which is intended to improve financial reporting by requiring timelier recording of credit losses on loans and other financial instruments held by financial institutions and other organizations. ASU 2016-13 requires the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Financial institutions and other organizations will now use forward-looking information to better inform their credit loss estimates. Many of the loss estimation techniques applied today will still be permitted, although the inputs to those techniques will change to reflect the full amount of expected credit losses. Organizations will continue to use judgment to determine which loss estimation method is appropriate for their circumstances. ASU 2016-13 requires enhanced disclosures to help investors and other financial statement users better understand significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards of an organization’s portfolio. These disclosures include qualitative and quantitative requirements that provide additional information about the amounts recorded in the financial statements. The new guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, which will be our interim period beginning January 1, 2020. We are evaluating the impact of this standard.

Adoption of Accounting Standards Codification 842

12 Months Ended

Dec. 31, 2019

Leases [Abstract]

Adoption of Accounting Standards Codification 842

We adopted ASC 842 with an initial application as of January 1, 2019. We utilized the additional transition method, under which the cumulative effect of initially applying the new guidance is recognized as an adjustment to certain captions on the consolidated balance sheet, including the opening balance of retained earnings in the year ended December 31, 2019. As part of the adoption of ASC 842, we have elected to utilize the following practical expedients that are permitted under ASC 842:


•	Need not reassess whether any expired or existing contracts are or contain leases;


•	Need not reassess the lease classification for any expired or existing leases;


•	Need not reassess initial direct costs for any existing leases;


•	As an accounting policy election by class of underlying asset, choose not to separate nonlease components from lease components and instead to account for each separate lease component and the nonlease components associated with that lease component as a single lease component; and


•	As an accounting policy election not to apply the recognition requirements in ASC 842 to short term leases (a lease at commencement date has a lease term of 12 months or less and does not contain a purchase option that the lessee is reasonably certain to exercise).

The net impact to the various captions on our January 1, 2019 opening consolidated balance sheets was as follows:



	(Dollars in thousands)
	December 31, 2018					January 1, 2019
Unaudited Consolidated Balance Sheets	Balances Without Adoption of ASC 842		Effect of Adoption			Balances With Adoption of ASC 842
Assets
Other current assets	$	6,531	$	(208	)	$	6,323
Operating lease right-of-use assets	$	—	$	18,985		$	18,985
Non-current deferred income taxes	$	308	$	5		$	313
Other assets	$	5,155	$	254		$	5,409
Liabilities
Operating lease liabilities	$	—	$	2,544		$	2,544
Accrued and other liabilities	$	37,786	$	(329	)	$	37,457
Non-current operating lease liabilities	$	—	$	18,117		$	18,117
Non-current deferred income taxes	$	18,070	$	(76	)	$	17,994
Other long-term liabilities	$	14,441	$	(956	)	$	13,485
Shareholders’ Equity
Retained earnings	$	180,356	$	(264	)	$	180,092

The net impact to retained earnings as a result of adopting ASC 842 on the January 1, 2019 opening balance sheet was shown as a change in “other” on the consolidated statements of cash flows.

We have operating and finance leases for manufacturing facilities, corporate offices, and various equipment. Our leases have remaining lease terms of 1 to 11 years, some of which include options to extend the leases for up to 5 years, and some of which include options to terminate the leases within 1 year.

The components of lease expense for the year ended December 31, 2019 were as follows:



	(In thousands)
Operating leases expense	$	3,963

Finance leases expense:
Amortization of right-of-use assets	$	216
Interest on lease liabilities	42
Total finance lease expense	$	258

Short term and variable lease expense for the year ended December 31, 2019 were not material.

Supplemental cash flow information related to leases for the year ended December 31, 2019 was as follows:



	(In thousands)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	4,030
Operating cash flows from finance leases	$	39
Financing cash flows from finance leases	$	169

Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$	2,574
Finance leases	$	483

The weighted average remaining lease terms as of December 31, 2019 were as follows:



	(In years)
Operating leases	7
Finance leases	4

When a lease is identified, we recognize a right-of-use asset and a corresponding lease liability based on the present value of the lease payments over the lease term discounted using our incremental borrowing rate, unless an implicit rate is readily determinable. As the discount rate in our leases is usually not readily available, we use our own incremental borrowing rate as the discount rate. Our incremental borrowing rate is based on the interest rate on our term loan, which is a secured rate. The interest rate on our term loan is based on London Interbank Offered Rate (“LIBOR”) plus an applicable margin. The difference between a three year, five year, or seven year LIBOR rate was not deemed significant and thus, we have chosen to use the five year incremental borrowing rate for all our leases.

The weighted average discount rates as of December 31, 2019 were as follows:



Operating leases	6.5	%
Finance leases	6.5	%

Maturity of operating and finance lease liabilities are as follows:



	(In thousands)
	Operating Leases		Finance Leases
2020	$	4,178	$	242
2021	4,147		229
2022	3,756		92
2023	3,425		53
2024	3,003		26
Thereafter	7,022		46
Total lease payments	25,531		688
Less imputed interest	5,010		74
Total	$	20,521	$	614

Operating lease payments include $11.4 million related to options to extend lease terms that are reasonably certain of being exercised. As of December 31, 2019, there are no legally binding minimum lease payments for leases signed but not yet commenced.

Finance lease payments related to options to extend lease terms that are reasonably certain of being exercised are not significant. As of December 31, 2019, it excludes $1.3 million of legally binding minimum lease payments for leases signed but not yet commenced. These finance leases will commence during 2020 with lease terms of 7 years to 10 years.

As previously disclosed in our 2018 Annual Report on Form 10-K and under the previous accounting maturities of lease liabilities were as follows as of December 31, 2018:



	(In thousands)
2019	$	3,680
2020	3,405
2021	2,789
2022	1,404
2023	980
Thereafter	580
Total	$	12,838

Adoption of Accounting Standards Codification 842


•	Need not reassess whether any expired or existing contracts are or contain leases;


•	Need not reassess the lease classification for any expired or existing leases;


•	Need not reassess initial direct costs for any existing leases;


•	As an accounting policy election by class of underlying asset, choose not to separate nonlease components from lease components and instead to account for each separate lease component and the nonlease components associated with that lease component as a single lease component; and


•	As an accounting policy election not to apply the recognition requirements in ASC 842 to short term leases (a lease at commencement date has a lease term of 12 months or less and does not contain a purchase option that the lessee is reasonably certain to exercise).

The net impact to the various captions on our January 1, 2019 opening consolidated balance sheets was as follows:



	(Dollars in thousands)
	December 31, 2018					January 1, 2019
Unaudited Consolidated Balance Sheets	Balances Without Adoption of ASC 842		Effect of Adoption			Balances With Adoption of ASC 842
Assets
Other current assets	$	6,531	$	(208	)	$	6,323
Operating lease right-of-use assets	$	—	$	18,985		$	18,985
Non-current deferred income taxes	$	308	$	5		$	313
Other assets	$	5,155	$	254		$	5,409
Liabilities
Operating lease liabilities	$	—	$	2,544		$	2,544
Accrued and other liabilities	$	37,786	$	(329	)	$	37,457
Non-current operating lease liabilities	$	—	$	18,117		$	18,117
Non-current deferred income taxes	$	18,070	$	(76	)	$	17,994
Other long-term liabilities	$	14,441	$	(956	)	$	13,485
Shareholders’ Equity
Retained earnings	$	180,356	$	(264	)	$	180,092

The net impact to retained earnings as a result of adopting ASC 842 on the January 1, 2019 opening balance sheet was shown as a change in “other” on the consolidated statements of cash flows.

The components of lease expense for the year ended December 31, 2019 were as follows:



	(In thousands)
Operating leases expense	$	3,963

Finance leases expense:
Amortization of right-of-use assets	$	216
Interest on lease liabilities	42
Total finance lease expense	$	258

Short term and variable lease expense for the year ended December 31, 2019 were not material.

Supplemental cash flow information related to leases for the year ended December 31, 2019 was as follows:



	(In thousands)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	4,030
Operating cash flows from finance leases	$	39
Financing cash flows from finance leases	$	169

Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$	2,574
Finance leases	$	483

The weighted average remaining lease terms as of December 31, 2019 were as follows:



	(In years)
Operating leases	7
Finance leases	4

The weighted average discount rates as of December 31, 2019 were as follows:



Operating leases	6.5	%
Finance leases	6.5	%

Maturity of operating and finance lease liabilities are as follows:



	(In thousands)
	Operating Leases		Finance Leases
2020	$	4,178	$	242
2021	4,147		229
2022	3,756		92
2023	3,425		53
2024	3,003		26
Thereafter	7,022		46
Total lease payments	25,531		688
Less imputed interest	5,010		74
Total	$	20,521	$	614

As previously disclosed in our 2018 Annual Report on Form 10-K and under the previous accounting maturities of lease liabilities were as follows as of December 31, 2018:



	(In thousands)
2019	$	3,680
2020	3,405
2021	2,789
2022	1,404
2023	980
Thereafter	580
Total	$	12,838

Business Combinations

12 Months Ended

Dec. 31, 2019

Business Combinations [Abstract]

Business Combination

Business Combinations

Nobles Worldwide, Inc.

On October 8, 2019, we acquired 100.0% of the outstanding equity interests of Nobles Parent Inc., the parent company of Nobles Worldwide, Inc. (“Nobles”), a privately-held global leader in the design and manufacturing of high performance ammunition handling systems for a wide range of military platforms including fixed-wing aircraft, rotary-wing aircraft, ground vehicles, and shipboard systems. Nobles is located in St. Croix Falls, Wisconsin. The acquisition of Nobles advances our strategy to diversify and offer more customized, value-driven engineered products with aftermarket opportunities.

The purchase price for Nobles was $77.0 million, net of cash acquired, all payable in cash. We paid $77.3 million upon the closing of the transaction. We preliminarily allocated the gross purchase price of $77.3 million to the assets acquired and liabilities assumed at estimated fair values. The excess of the purchase price over the aggregate fair values of the net assets was recorded as goodwill. The allocation is subject to revision as the estimates of fair value of the assets acquired and liabilities assumed are based on preliminary information and are subject to refinement. We are in the process of reviewing third party valuation of the assets and liabilities.

The following table summarizes the preliminary estimated fair value of the assets acquired and liabilities assumed at the date of acquisition (in thousands):



	Estimated Fair Value
Cash	$	658
Accounts receivable	1,880
Inventories	2,866
Other current assets	168
Property and equipment	2,319
Intangible assets	37,700
Goodwill	34,860
Other non-current assets	675
Total assets acquired	81,126
Current liabilities	(2,285		)
Net non-current deferred tax liability	(861		)
Other non-current liabilities	(675		)
Total liabilities assumed	(3,821		)
Total purchase price allocation	$	77,305



	Useful Life (In years)	Estimated Fair Value (In thousands)
Intangible assets:
Customer relationships	15-16	$	34,700
Trade names and trademarks	15	3,000
		$	37,700

The intangible assets acquired of $37.7 million were preliminarily determined based on the estimated fair values using valuation techniques consistent with the income approach to measure fair value. The useful lives were estimated based on the underlying agreements or the future economic benefit expected to be received from the assets. The fair values of the identifiable intangible assets were estimated using several valuation methodologies, which represented Level 3 fair value measurements. The value for customer relationships was estimated based on a multi-period excess earnings approach, while the value for trade names and trademarks was assessed using the relief from royalty methodology.

The goodwill of $34.9 million arising from the acquisition is attributable to the benefits we expect to derive from expected synergies from the transaction, including complementary products that will enhance our overall product portfolio, opportunities within new markets, and an acquired assembled workforce. All the goodwill was assigned to the Structural Systems segment. The Nobles acquisition, for tax purposes, is also deemed a stock acquisition and thus, the goodwill recognized is not deductible for income tax purposes except for $6.7 million of pre-acquisition goodwill that is tax deductible.

Acquisition related transaction costs were not included as components of consideration transferred but have been expensed as incurred. Total acquisition-related transaction costs incurred by us were $0.8 million during 2019 and charged to selling, general and administrative expenses.

Nobles’ results of operations have been included in our consolidated statements of income since the date of acquisition as part of the Structural Systems segment. Pro forma results of operations of the Nobles acquisition have not been presented as the effect of the Nobles acquisition was not material to our financial results.

Certified Thermoplastics Co., LLC

In April 2018, we acquired 100.0% of the outstanding equity interests of Certified Thermoplastics Co., LLC (“CTP”), a privately-held leader in precision profile extrusions and extruded assemblies of engineered thermoplastic resins, compounds, and alloys for a wide range of commercial aerospace, defense, medical, and industrial applications. CTP is located in Santa Clarita, California. The acquisition of CTP was part of our strategy to diversify towards more customized, higher value, engineered products with greater aftermarket potential.

The purchase price for CTP was $30.7 million, net of cash acquired, all payable in cash. We paid an aggregate of $30.8 million in cash related to this transaction. We allocated the gross purchase price of $30.8 million to the assets acquired and liabilities assumed at estimated fair values. The estimated fair value of the assets acquired included $8.1 million of intangible assets, $2.2 million of inventories, $1.5 million of accounts receivable, $0.6 million of property and equipment, $0.1 million of cash, less than $0.1 million of other current assets, and $0.4 million of liabilities assumed. The excess of the purchase price over the aggregate fair values of the assets acquired and liabilities assumed of $18.6 million was recorded as goodwill. The intangible assets acquired were comprised of $6.9 million for customer relationships and $1.2 million for trade names and trademarks, all of which were assigned an estimated useful life of 10 years. All the goodwill was assigned to the Structural Systems segment. Since the CTP acquisition, for tax purposes, was deemed an asset acquisition, the goodwill recognized is deductible for income tax purposes.

CTP’s results of operations have been included in our consolidated statements of income since the date of acquisition as part of the Structural Systems segment.

Restructuring Activities

12 Months Ended

Dec. 31, 2019

Restructuring and Related Activities [Abstract]

Restructuring Activities

In November 2017, management approved and commenced a restructuring plan that was intended to increase operating efficiencies (“2017 Restructuring Plan”). We completed the 2017 Restructuring Plan as of December 31, 2018 and have recorded cumulative expenses of $23.6 million, with $14.8 million recorded during 2018, and $8.8 million recorded during 2017.

In the Electronic Systems segment, we recorded cumulative expenses of $3.8 million for severance and benefits which were classified as restructuring charges. We recorded cumulative of $0.9 million for loss on early exit from lease termination which was classified as restructuring charges. We also recorded cumulative expenses of $0.9 million of other expenses which were classified as restructuring charges. In addition, we recorded cumulative expenses of $0.2 million for professional service fees which were classified as restructuring charges. Further, we recorded cumulative non-cash expenses of $0.1 million for inventory write down which were classified as cost of sales. Finally, we recorded cumulative non-cash expenses of $0.1 million for property and equipment impairment which were classified as restructuring charges.

In the Structural Systems segment, we recorded cumulative expenses of $3.0 million for severance and benefits which were classified as restructuring charges. We recorded cumulative non-cash expenses of $9.8 million for property and equipment impairment which were classified as restructuring charges. We also recorded cumulative non-cash expenses of $0.5 million for inventory write down which were classified as cost of sales. Further, we recorded cumulative other expenses of $0.4 million which were classified as restructuring charges.

In Corporate, we recorded cumulative expenses of $1.4 million for severance and benefits which was classified as restructuring charges. We recorded cumulative non-cash expenses of $1.4 million for stock-based compensation awards which were modified, all of which were classified as restructuring charges. We also recorded cumulative expenses of $1.0 million for professional service fees which were classified as restructuring charges.

As of December 31, 2019, all restructuring activities have been completed and thus, there were no accruals remaining.

Our restructuring activities for 2019 were as follows (in thousands):



	December 31, 2018		2019											December 31, 2019
	Balance		Charges		Cash Payments			Adoption of ASC 842 Adjustment			Change in Estimates			Balance
Severance and benefits	$	2,631	$	—	$	(2,631	)	$	—		$	—		$	—
Lease termination	861		—		(126		)	(735		)	—			—
Professional service fees	43		—		(43		)	—			—			—
Other	416		—		(416		)	—			—			—
Total charged to restructuring charges	3,951		—		(3,216		)	(735		)	—			—
Inventory reserve	50		—		—			—			(50		)	—
Total charged to cost of sales	50		—		—			—			(50		)	—
Ending balance	$	4,001	$	—	$	(3,216	)	$	(735	)	$	(50	)	$	—

Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

Goodwill

The carrying amounts of goodwill, by operating segment, for the years ended December 31, 2019 and 2018 were as follows:



	(In thousands)
	Electronic Systems			Structural Systems		Consolidated Ducommun
Gross goodwill	$	199,157		$	18,622	$	217,779
Accumulated goodwill impairment	(81,722		)	—		(81,722		)
Balance at December 31, 2018	117,435			18,622		136,057
Goodwill from acquisition during the period	—			34,860		34,860
Balance at December 31, 2019	$	117,435		$	53,482	$	170,917

We perform our annual goodwill impairment test as of the first day of the fourth quarter. See Note 1.

We acquired Certified Thermoplastics Co., LLC (“CTP”) in April 2018 and recorded goodwill of $18.6 million in our Structural Systems segment. Since a goodwill impairment analysis is required to be performed within one year of the acquisition date or sooner upon a triggering event, we performed a Step One goodwill impairment analysis as of April 2019 for our Structural Systems segment, which is also our reporting unit. The fair value of our Structural Systems segment exceeded its carrying value by 85% and thus, was not deemed impaired.

On October 8, 2019, we acquired 100.0% of the outstanding equity interests of Nobles for a purchase price of $77.0 million, net of cash acquired. We allocated the gross purchase price of $77.3 million to the assets acquired and liabilities assumed at estimated fair values. The excess of the purchase over the aggregate fair values was recorded as goodwill within the Structural Systems reporting unit. See Note 3.

In April 2018, we acquired 100.0% of the outstanding equity interests of CTP for a purchase price of $30.7 million, net of cash acquired. We allocated the gross purchase price of $30.8 million to the assets acquired and liabilities assumed at estimated fair values. The excess of the purchase over the aggregate fair values was recorded as goodwill within the Structural Systems reporting unit. See Note 3.

Other intangible assets are related to acquisitions, including Nobles, and recorded at fair value at the time of the acquisition. Other intangible assets with finite lives are generally amortized on the straight-line method over periods ranging from 10 to 18 years. Intangible assets are as follows:



		(In thousands)
		December 31, 2019						December 31, 2018
	Wtd. Avg Life (Yrs)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Finite-lived assets
Customer relationships	17	$	221,900	$	88,838	$	133,062	$	187,200	$	77,824	$	109,376
Trade names and trademarks	14	5,500		450		5,050		2,500		193		2,307
Contract renewal	14	1,845		1,757		88		1,845		1,625		220
Technology	15	400		238		162		400		211		189
Total		$	229,645	$	91,283	$	138,362	$	191,945	$	79,853	$	112,092

The carrying amount of other intangible assets by operating segment as of December 31, 2019 and 2018 was as follows:



	(In thousands)
	December 31, 2019						December 31, 2018
	Gross		Accumulated Amortization		Net Carrying Value		Gross		Accumulated Amortization		Net Carrying Value
Other intangible assets
Electronic Systems	$	164,545	$	71,527	$	93,018	$	164,545	$	62,108	$	102,437
Structural Systems	65,100		19,756		45,344		27,400		17,745		9,655
Total	$	229,645	$	91,283	$	138,362	$	191,945	$	79,853	$	112,092

Amortization expense of other intangible assets was $11.4 million, $10.7 million and $9.3 million for the years ended December 31, 2019, 2018 and 2017, respectively. Future amortization expense by operating segment is expected to be as follows:



	(In thousands)
	Electronic Systems		Structural Systems		Consolidated Ducommun
2020	$	9,348	$	3,719	$	13,067
2021	9,287		3,614		12,901
2022	9,288		3,553		12,841
2023	9,287		3,495		12,782
2024	9,288		3,260		12,548
Thereafter	46,520		27,703		74,223
	$	93,018	$	45,344	$	138,362

Long-Term Debt

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

Long-Term Debt

Long-term debt and the current period interest rates were as follows:



	(In thousands) December 31,
	2019			2018
Term loans	$	310,000		$	233,000
Revolving credit facility	—			—
Total debt	310,000			233,000
Less current portion	7,000			2,330
Total long-term debt, less current portion	303,000			230,670
Less debt issuance costs - term loans	2,113			1,802
Total long-term debt, net of debt issuance costs - term loans	$	300,887		$	228,868
Debt issuance costs - revolving credit facility ⁽¹⁾	$	1,894		$	1,907
Weighted-average interest rate	6.87		%	4.71		%

(1) Included as part of other assets.

Future long-term debt payments at December 31, 2019 were as follows:



	(In thousands)
2020	$	7,000
2021	7,000
2022	7,000
2023	7,000
2024	112,000
Thereafter	170,000
Total	$	310,000

On December 20, 2019, we completed the refinancing of a portion of our existing debt by entering into a new revolving credit facility (“New Revolving Credit Facility”) to replace the existing revolving credit facility that was entered into in November 2018 (“2018 Revolving Credit Facility”) and entering into a new term loan (“New Term Loan”). The New Revolving Credit Facility is a $100.0 million senior secured revolving credit facility that matures on December 20, 2024 replacing the $100.0 million 2018 Revolving Credit Facility that would have matured on November 21, 2023. The New Term Loan is a $140.0 million senior secured term loan that matures on December 20, 2024. We also have an existing $240.0 million senior secured term loan that was entered into in November 2018 that matures on November 21, 2025 (“2018 Term Loan”). The original amounts available under the New Revolving Credit Facility, New Term Loan, and 2018 Term Loan (collectively, the “Credit Facilities”) in aggregate, totaled $480.0 million.

The New Term Loan bears interest, at our option, at a rate equal to either (i) the Eurodollar Rate (defined as the London Interbank Offered Rate [“LIBOR”]) plus an applicable margin ranging from 1.50% to 2.50% per year or (ii) the Base Rate (defined as the highest of [a] Federal Funds Rate plus 0.50%, [b] Bank of America’s prime rate, and [c] the Eurodollar Rate plus 1.00%) plus an applicable margin ranging from 0.50% to 1.50% per year, in each case based upon the consolidated total net adjusted leverage ratio, typically payable quarterly. In addition, the New Term Loan requires installment payments of 1.25% of the original outstanding principal balance of the New Term Loan amount on a quarterly basis.

The New Revolving Credit Facility bears interest, at our option, at a rate equal to either (i) the Eurodollar Rate (defined as LIBOR) plus an applicable margin ranging from 1.50% to 2.50% per year or (ii) the Base Rate (defined as the highest of [a] Federal Funds Rate plus 0.50%, [b] Bank of America’s prime rate, and [c] the Eurodollar Rate plus 1.00%) plus an applicable margin ranging from 0.50% to 1.50% per year, in each case based upon the consolidated total net adjusted leverage ratio, typically payable quarterly. The undrawn portion of the commitment of the New Revolving Credit Facility is subject to a commitment fee ranging from 0.175% to 0.275%, based upon the consolidated total net adjusted leverage ratio.

In November 2018, we completed credit facilities to replace the then existing credit facilities. The November 2018 credit facilities consisted of the 2018 Term Loan and the 2018 Revolving Credit Facility.

The 2018 Term Loan bears interest, at our option, at a rate equal to either (i) the Eurodollar Rate (defined as LIBOR plus an applicable margin ranging from 3.75% to 4.00% per year or (ii) the Base Rate (defined as the highest of [a] Federal Funds Rate plus 0.50%, [b] Bank of America’s prime rate, and [c] the Eurodollar Rate plus 1.00%) plus an applicable margin ranging from 3.75% to 4.00% per year, in each case based upon the consolidated total net adjusted leverage ratio, typically payable quarterly. In addition, the 2018 Term Loan requires installment payments of 0.25% of the outstanding principal balance of the 2018 Term Loan amount on a quarterly basis.

The 2018 Revolving Credit Facility bears interest, at our option, at a rate equal to either (i) the Eurodollar Rate (defined as LIBOR) plus an applicable margin ranging from 1.75% to 2.75% per year or (ii) the Base Rate (defined as the highest of [a] Federal Funds Rate plus 0.50%, [b] Bank of America’s prime rate, and [c] the Eurodollar Rate plus 1.00%) plus an applicable margin ranging from 0.75% to 1.75% per year, in each case based upon the consolidated total net adjusted leverage ratio, typically payable quarterly. The undrawn portion of the commitment of the 2018 Revolving Credit Facility is subject to a commitment fee ranging from 0.200% to 0.300%, based upon the consolidated total net adjusted leverage ratio.

Further, under the Credit Facilities, if we meet the annual excess cash flow threshold, we will be required to make excess flow payments. The annual mandatory excess cash flow payments will be based on (i) 50% of the excess cash flow amount if the adjusted leverage ratio is greater than 3.25 to 1.0, (ii) 25% of the excess cash flow amount if the adjusted leverage ratio is less than or equal to 3.25 to 1.0 but greater than 2.50 to 1.0, and (iii) zero percent of the excess cash flow amount if the adjusted leverage ratio is less than or equal to 2.50 to 1.0. As of December 31, 2019, we were in compliance with all covenants required under the Credit Facilities.

We have been making periodic voluntary principal prepayments on our credit facilities, however, during 2019, as a result of drawing down on the New Term Loan, we made no net aggregate voluntary prepayments.

In conjunction with entering into the New Revolving Credit Facility and the New Term Loan, we drew down the entire $140.0 million on the New Term Loan and used those proceeds to pay off and close the 2018 Revolving Credit Facility of $58.5 million, pay down a portion of the 2018 Term Loan of $56.0 million, pay the accrued interest associated with the amounts being paid down on the 2018 Revolving Credit Facility and 2018 Term Loan, pay the fees related to this transaction, and the remainder will be used for general corporate expenses. The New Term Loan and 2018 Term Loan were considered a modification of debt and thus, no gain or loss was recorded. Instead, the new fees paid to the lenders of $0.6 million were capitalized and are being amortized over the life of the New Term Loan. The remaining debt issuance costs related to the 2018 Term Loan of $1.5 million will continue to be amortized over its remaining life.

The New Revolving Credit Facility that replaced the 2018 Revolving Credit Facility was considered an extinguishment of debt except for the portion related to the creditors that were part of both the New Revolving Credit Facility and the 2018 Revolving Credit Facility and in which case, it was considered a modification of debt. As a result, we expensed the portion of the unamortized debt issuance costs related to the 2018 Revolving Credit Facility that was considered an extinguishment of debt of $0.5 million. In addition, the new fees paid to the lenders of $0.5 million as part of the New Revolving Credit Facility were capitalized and are being amortized over its remaining life. Further, the remaining debt issuance costs related to the 2018 Revolving Credit Facility of $1.1 million will also be amortized its remaining life.

In conjunction with entering into the 2018 Credit Facilities in November 2018, we drew down the entire $240.0 million on the 2018 Term Loan, $7.9 million on the 2018 Revolving Credit Facility and used those proceeds along with current cash on hand to pay off the then existing credit facilities of $247.9 million. The 2018 Term Loan replaced the term loan that was a part of the then existing credit facilities was considered an extinguishment of debt except for the portion related to a creditor that was part of the then existing term loan and the 2018 Term Loan and in which case, it was considered a modification of debt. As a result, we expensed the portion of the unamortized debt issuance costs related to the then existing term loan that was considered an extinguishment of debt of $0.4 million. In addition, the 2018 Revolving Credit Facility replaced the then existing revolving credit facility that was part of the then existing credit facilities was considered an extinguishment of debt except for the portion related to the creditors that were part of the then existing revolving credit facility and the 2018 Revolving Credit Facility and in which case, it was considered a modification of debt. As a result, we expensed the portion of the unamortized debt issuance costs related to the 2018 Revolving Credit Facility that was considered an extinguishment of debt of $0.5 million. As such, an aggregate total loss on extinguishment of debt of $0.9 million was recorded in 2018.

Further, we incurred $3.5 million of new debt issuance costs that can be capitalized related to the 2018 Credit Facilities, of which $1.7 million were allocated to the 2018 Term Loan and the remaining $1.8 million was allocated to the 2018 Revolving Credit Facility. The 2018 Term Loan new debt issuance costs of $1.7 million and remaining unamortized then existing term loan debt issuance costs of $0.1 million, for an aggregate total of $1.8 million of debt issuance costs related to the 2018 Term Loan were capitalized and are being amortized over the seven year life of the 2018 Term Loan. The 2018 Revolving Credit Facility new debt issuance costs of $1.8 million and remaining unamortized then existing revolving credit facility debt issuance costs of $0.2 million, for an aggregate total of $2.0 million of debt issuance costs related to the 2018 Revolving Credit Facility were capitalized and were being amortized over the five years life of the 2018 Revolving Credit Facility.

On October 8, 2019, we acquired 100.0% of the outstanding equity interests of Nobles for a purchase price of $77.0 million, net of cash acquired, all payable in cash. Upon the closing of the transaction, we paid $77.3 million in cash by drawing down on the 2018 Revolving Credit Facility. See Note 3.

In April 2018, we acquired CTP for a purchase price of $30.7 million, net of cash acquired, all payable in cash. We paid an aggregate of $30.8 million in cash by drawing down on the then existing revolving credit facility. See Note 3.

In September 2017, we acquired Lightning Diversion Systems, LLC (“LDS”) for a purchase price of $60.0 million, net of cash acquired, all payable in cash. Upon the closing of the transaction, we paid $61.4 million in cash by drawing down on our then existing revolving credit facility. The remaining $0.6 million was paid in October 2017 in cash, also by drawing down on our then existing revolving credit facility.

As of December 31, 2019, we had $99.8 million of unused borrowing capacity under the New Revolving Credit Facility, after deducting $0.2 million for standby letters of credit.

The New Credit Facilities were entered into by us (“Parent Company”) and guaranteed by all of our subsidiaries, other than two subsidiaries that were considered minor (“Subsidiary Guarantors”). The Subsidiary Guarantors jointly and severally guarantee the New Credit Facilities. The Parent Company has no independent assets or operations and therefore, no consolidating financial information for the Parent Company and its subsidiaries are presented.

In October 2015, we entered into interest rate cap hedges designated as cash flow hedges with a portion of these interest rate cap hedges maturing on a quarterly basis, and a final quarterly maturity date of June 2020, in aggregate, totaling $135.0 million of our debt. We paid a total of $1.0 million in connection with the interest rate cap hedges. See Note 1 for further information.

In December 2018 and 2017, we entered into agreements to purchase $2.2 million and $14.2 million of industrial revenue bonds (“IRBs”) issued by the city of Parsons, Kansas (“Parsons”) and concurrently, sold $2.2 million and $14.2 million of property and equipment (“Property”) to Parsons as well as entered into lease agreements to lease the Property from Parsons (“Lease”) with lease payments totaling $2.2 million and $14.2 million over the lease terms, respectively. The sale of the Property and concurrent lease back of the Property in December 2018 and 2017 did not meet the sale-leaseback accounting requirements as a result of our continuous involvement with the Property and thus, the $2.2 million and $14.2 million in cash received from Parsons was not recorded as a sale but as a financing obligation, respectively. Further, the Lease included a right of offset so long as we continue to own the IRBs and thus, the financing obligations of $2.2 million and $14.2 million were offset against the $2.2 million and $14.2 million, respectively, of IRBs assets and are presented net on the consolidated balance sheets with no impact to the consolidated statements of income or consolidated cash flow statements.

Stock-Based Compensation

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

Stock-Based Compensation

Stock Incentive Compensation Plans

We currently have two stock incentive plans: i) the 2013 Stock Incentive Plan, as amended (the “2013 Plan”), which expires on May 2, 2028, provided that Incentive Stock Options may not be granted after February 21, 2028, and ii) the 2018 Employee Stock Purchase Plan (“ESPP”). The 2013 Plan permit awards of stock options, restricted stock units, performance stock units and other stock-based awards to our officers, key employees and non-employee directors on terms determined by the Compensation Committee of the Board of Directors (the “Compensation Committee”). The aggregate number of shares available for issuance under the 2013 Plan is 1,690,000. Under the 2013 Plan, no more than an aggregate of 337,693 shares are available for issue of stock-based awards other than stock options and stock appreciation rights after December 31, 2017. As of December 31, 2019, shares available for future grant under the 2013 Plan are 222,132. Prior to the adoption of the 2013 Plan, we granted stock-based awards to purchase shares of our common stock under certain predecessor plans. No further awards can be granted under these predecessor plans.

Employee Stock Purchase Plan

The ESPP was adopted by the Board of Directors and approved by the shareholders in 2018, including 750,000 shares that can be awarded. The first offering period closed on July 31, 2019. Under the ESPP, our employees who elect to participate have the right to purchase common stock at a 15% discount from the lower of the market value of the common stock at the beginning or the end of each six month offering period and the discount will be treated as compensation to those employees. Employees purchase common stock using payroll deductions, which may not exceed 10% of their eligible compensation and other limitations. The Compensation Committee administers the ESPP. As of December 31, 2019, there are 723,479 shares available for future award grants.

Stock Options

In the years ended December 31, 2019, 2018, and 2017, we granted stock options to our officers and key employees of 189,170, 176,940, and 129,400, respectively, with weighted-average grant date fair values of $15.95, $12.87, and $11.88, respectively. Stock options have been granted with an exercise price equal to the fair market value of our stock on the date of grant and expire not more than ten years from the date of grant. The stock options typically vest over a period of three or four years from the date of grant. The option price and number of shares are subject to adjustment under certain dilutive circumstances. If an employee terminates employment, the non-vested portion of the stock options will not vest and all rights to the non-vested portion will terminate completely.

Stock option activity for the year ended December 31, 2019 were as follows:



	Number of Stock Options		Weighted- Average Exercise Price Per Share		Weighted-Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2019	363,225		$	28.33
Granted	189,170		$	41.97
Exercised	(80,693	)	$	24.97
Expired	(2,857	)	$	20.09
Forfeited	(22,027	)	$	29.99
Outstanding at December 31, 2019	446,818		$	34.68	7.7	$	7,319
Exerciseable at December 31, 2019	96,947		$	27.70	5.3	$	2,265

Changes in nonvested stock options for the year ended December 31, 2019 were as follows:



	Number of Stock Options		Weighted- Average Grant Date Fair Value
Nonvested at January 1, 2019	292,013		$	12.20
Granted	189,170		$	15.95
Vested	(109,285	)	$	11.95
Forfeited	(22,027	)	$	10.24
Nonvested at December 31, 2019	349,871		$	14.33

The aggregate intrinsic value of stock options represents the amount by which the market price of our common stock exceeds the exercise price of the stock option. The aggregate intrinsic value of stock options exercised for the years ended December 31, 2019, 2018 and 2017 was $1.8 million, $1.3 million, and $2.5 million, respectively. Cash received from stock options exercised for the years ended December 31, 2019, 2018 and 2017 was $2.6 million, $1.8 million, and $4.3 million, respectively, with related tax benefits of $0.6 million, $0.3 million, and $0.9 million, respectively. The total amount of stock options vested and expected to vest in the future is 446,818 shares with a weighted-average exercise price of $34.68 and an aggregate intrinsic value of $7.3 million. These stock options have a weighted-average remaining contractual term of 7.7 years.

The share-based compensation cost expensed for stock options for the years ended December 31, 2019, 2018, and 2017 (before tax benefits) was $1.6 million, $0.9 million, and $0.7 million, respectively, and is included in selling, general and administrative expenses on the consolidated income statements. At December 31, 2019, total unrecognized compensation cost (before tax benefits) related to stock options of $3.7 million is expected to be recognized over a weighted-average period of 2.0 years. The total fair value of stock options vested during the years ended December 31, 2019, 2018, and 2017 was $1.3 million, $0.8 million, and $0.8 million, respectively.

We apply fair value accounting for stock-based compensation based on the grant date fair value estimated using a Black-Scholes-Merton (“Black-Scholes”) valuation model. The assumptions used to compute the fair value of stock option grants under the Stock Incentive Plans for years ended December 31, 2019, 2018, and 2017 were as follows:



	Years Ended December 31,
	2019		2018		2017
Risk-free interest rate	1.92	%	2.65	%	1.75	%
Expected volatility	40.44	%	53.66	%	50.37	%
Expected dividends	—		—		—
Expected term (in months)	60		36		48

We recognize compensation expense, net of an estimated forfeiture rate, on a straight-line basis over the requisite service period of the award. We have award populations with option vesting terms of three and four years. We estimate the forfeiture rate based on our historic experience, attempting to determine any discernible activity patterns. The expected life computation is based on historic exercise patterns and post-vesting termination behavior. The risk-free interest rate for periods within the contractual life of the award is based on the U.S. Treasury yield curve in effect at the time of grant. The expected volatility is derived from historical volatility of our common stock. We suspended payments of dividends after the first quarter of 2011.

Restricted Stock Units

We granted restricted stock units (“RSUs”) to certain officers, key employees and non-employee directors of 62,520, 81,230, and 135,350 RSUs during the years ended December 31, 2019, 2018, and 2017, respectively, with weighted-average grant date fair values (equal to the fair market value of our stock on the date of grant) of $41.04, $32.36, and $28.97 per share, respectively. RSUs represent a right to receive a share of stock at future vesting dates with no cash payment required from the holder. The RSUs typically have a three year vesting term of 33%, 33% and 34% on the first, second and third anniversaries of the date of grant, respectively. If an employee terminates employment, their non-vested portion of the RSUs will not vest and all rights to the non-vested portion will terminate.

Restricted stock unit activity for the year ended December 31, 2019 was as follows:



	Number of Restricted Stock Units		Weighted- Average Grant Date Fair Value
Outstanding at January 1, 2019	157,937		$	28.96
Granted	62,520		$	41.04
Vested	(85,279	)	$	27.94
Forfeited	(7,755	)	$	30.80
Outstanding at December 31, 2019	127,423		$	36.22

The share-based compensation cost expensed for RSUs for the years ended December 31, 2019, 2018, and 2017 (before tax benefits) was $2.4 million, $2.1 million, and $2.0 million respectively, and is included in selling, general and administrative expenses on the consolidated income statements. At December 31, 2019, total unrecognized compensation cost (before tax benefits) related to RSUs of $2.9 million is expected to be recognized over a weighted average period of 1.4 years. The total fair value of RSUs vested for the years ended December 31, 2019, 2018, and 2017 was $2.4 million, $2.7 million, and $3 million, respectively. The tax benefit realized from vested RSUs for the years ended December 31, 2019, 2018, and 2017 was $0.6 million, $0.6 million, and $1.1 million, respectively.

Performance Stock Units

We granted performance stock awards (“PSUs”) to certain key employees of 58,178, 64,700, and 126,000 PSUs during the years ended December 31, 2019, 2018, and 2017, respectively, with weighted-average grant date fair values of $43.80, $35.16, and $26.31 per share, respectively. PSU awards are subject to the attainment of performance goals established by the Compensation Committee, the periods during which performance is to be measured, and all other limitations and conditions applicable to the awarded shares. Performance goals are based on a pre-established objective formula that specifies the manner of determining the number of performance stock awards that will be granted if performance goals are attained. If an employee terminates employment, their non-vested portion of the PSUs will not vest and all rights to the non-vested portion will terminate.

Performance stock activity for the year ended December 31, 2019 was as follows:



	Number of Performance Stock Units		Weighted- Average Grant Date Fair Value
Outstanding at January 1, 2019	236,700		$	26.21
Granted	58,178		$	43.80
Vested	(85,504	)	$	19.05
Forfeited	(11,800	)	$	33.21
Outstanding at December 31, 2019	197,574		$	33.98

The share-based compensation cost expensed for PSUs for the years ended December 31, 2019, 2018, and 2017 (before tax benefits) was $3.2 million, $1.9 million and $2.0 million, respectively, and is included in selling, general and administrative expenses on the consolidated income statements. At December 31, 2019, total unrecognized compensation cost (before tax benefits) related to PSUs of $3.2 million is expected to be recognized over a weighted-average period of 2.3 years. The total fair value of PSUs vested during the years ended December 31, 2019, 2018, and 2017, was $3.8 million, $0.3 million, and $1.2 million, respectively. The tax benefit realized from PSUs for the years ended December 31, 2019, 2018, and 2017 were $0.9 million, $0.1 million, and $0.5 million, respectively.

Employee Benefit Plans

12 Months Ended

Dec. 31, 2019

Retirement Benefits [Abstract]

Employee Benefit Plans

Supplemental Retirement Plans

We have three unfunded supplemental retirement plans. The first plan was suspended in 1986, but continues to cover certain former executives. The second plan was suspended in 1997, but continues to cover certain current and retired directors. The third plan covers certain current and retired employees and further employee contributions to this plan were suspended on August 5, 2011. The liability for the third plan and interest thereon is included in accrued employee compensation and long-term liabilities and was zero and $0.1 million, respectively, at December 31, 2019 and $0.7 million and $0.1 million, respectively, at December 31, 2018. The accumulated benefit obligations of the first two plans at December 31, 2019 and December 31, 2018 were $0.4 million and $0.6 million, respectively, and are included in accrued liabilities.

Defined Contribution 401(K) Plans

We sponsor a 401(k) defined contribution plan for all our employees. The plan allows the employees to make annual voluntary contributions not to exceed the lesser of an amount equal to 25% of their compensation or limits established by the Internal Revenue Code. Under this plan, we generally provide a match equal to 50% of the employee’s contributions up to the first 6% of compensation, except for union employees who are not eligible to receive the match. Our provision for matching and profit sharing contributions for the three years ended December 31, 2019, 2018, and 2017 was $2.7 million, $2.6 million, and $2.7 million, respectively.

Other Plans

We have a defined benefit pension plan covering certain hourly employees of a subsidiary (the “Pension Plan”). Pension Plan benefits are generally determined on the basis of the retiree’s age and length of service. Assets of the Pension Plan are composed primarily of fixed income and equity securities. We also have a retirement plan covering certain current and retired employees (the “LaBarge Retirement Plan”). As part of the acquisition of CTP, we acquired their defined benefit pension plan (the “CTP Pension Plan”), which covered certain current and retired employees that were fully funded by CTP as of the acquisition date in April 2018. The CTP Pension Plan was suspended as of the acquisition date but continued to cover certain current and former CTP employees. The CTP Pension Plan gross assets, liabilities, and current year expense were immaterial for disclosure purposes. The CTP Pension Plan was subsequently liquidated in November 2019 with no loss recorded as a pension plan escrow fund was established as part of the acquisition to cover any losses until it was liquidated.

The components of net periodic pension cost for the Pension Plan and LaBarge Retirement Plan in aggregate are as follows:



	(In thousands) Years Ended December 31,
	2019			2018			2017
Service cost	$	503		$	601		$	531
Interest cost	1,388			1,268			1,329
Expected return on plan assets	(1,644		)	(1,784		)	(1,530		)
Amortization of actuarial losses	885			743			810
Net periodic pension cost	$	1,132		$	828		$	1,140

The components of the reclassifications of net actuarial losses from accumulated other comprehensive loss to net income for 2019 were as follows:



	(In thousands) Year Ended December 31,
	2019
Amortization of actuarial loss - total before tax ⁽¹⁾	$	885
Tax benefit	(209		)
Net of tax	$	676


(1)	The amortization expense is included in the computation of periodic pension cost and is a decrease to net income upon reclassification from accumulated other comprehensive loss.

The estimated net actuarial loss for both plans that will be amortized from accumulated other comprehensive loss into net periodic cost during 2020 is $0.9 million.

The obligations, fair value of plan assets, and funded status of both plans are as follows:



	(In thousands) December 31,
	2019			2018
Change in benefit obligation⁽¹⁾
Beginning benefit obligation (January 1)	$	33,951		$	36,002
Service cost	503			601
Interest cost	1,388			1,268
Actuarial (gain) loss	4,769			(2,415		)
Benefits paid	(1,526		)	(1,505		)
Ending benefit obligation (December 31)	$	39,085		$	33,951
Change in plan assets
Beginning fair value of plan assets (January 1)	$	23,749		$	25,646
Return on assets	4,347			(1,951		)
Employer contribution	1,873			1,559
Benefits paid	(1,526		)	(1,505		)
Ending fair value of plan assets (December 31)	$	28,443		$	23,749
Funded status (underfunded)	$	(10,642	)	$	(10,202	)
Amounts recognized in the consolidated balance sheet
Current liabilities	$	—		$	580
Non-current liabilities	$	10,642		$	9,622
Unrecognized loss included in accumulated other comprehensive loss
Beginning unrecognized loss, before tax (January 1)	$	9,485		$	8,908
Amortization	(885		)	(743		)
Liability (gain) loss	4,769			(2,415		)
Asset loss (gain)	(2,709		)	3,735
Ending unrecognized loss, before tax (December 31)	10,660			9,485
Tax impact	(2,544		)	(2,263		)
Unrecognized loss included in accumulated other comprehensive loss, net of tax	$	8,116		$	7,222


(1)	Projected benefit obligation equals the accumulated benefit obligation for the plans.

On December 31, 2019, our annual measurement date, the accumulated benefit obligation exceeded the fair value of the plans assets by $10.6 million. Such excess is referred to as an unfunded accumulated benefit obligation. We recorded unrecognized loss included in accumulated other comprehensive loss, net of tax at December 31, 2019 and 2018 of $8.1 million and $7.2 million, respectively, which decreased shareholders’ equity. This charge to shareholders’ equity represents a net loss not yet recognized as pension expense. This charge did not affect reported earnings, and would be decreased or be eliminated if either interest rates increase or market performance and plan returns improve which will cause the Pension Plan to return to fully funded status.

Our Pension Plan asset allocations at December 31, 2019 and 2018, by asset category, were as follows:



	December 31,
	2019		2018
Equity securities	69	%	57	%
Cash and equivalents	1	%	1	%
Debt securities	30	%	42	%
Total⁽¹⁾	100	%	100	%


(1)	Our overall investment strategy is to achieve an asset allocation within the following ranges to achieve an appropriate rate of return relative to risk.



Cash	0-10%
Fixed income securities	15-75%
Equities	30-80%

Pension Plan assets consist primarily of listed stocks and bonds and do not include any of the Company’s securities. The return on assets assumption reflects the average rate of return expected on funds invested or to be invested to provide for the benefits included in the projected benefit obligation. We select the return on asset assumption by considering our current and target asset allocation. We consider information from various external investment managers, forward-looking information regarding expected returns by asset class and our own judgment when determining the expected returns.



	(In thousands) Year Ended December 31, 2019
	Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	232	$	—	$	—	$	232
Fixed income securities	3,247		—		—		3,247
Equities⁽¹⁾	2,645		—		—		2,645
Other investments	1,552		—		—		1,552
Total plan assets at fair value	$	7,676	$	—	$	—	7,676
Pooled funds							20,767
Total fair value of plan assets							$	28,443



	(In thousands) Year Ended December 31, 2018
	Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	153	$	—	$	—	$	153
Fixed income securities	3,647		—		—		3,647
Equities⁽¹⁾	1,475		—		—		1,475
Other investments	851		—		—		851
Total plan assets at fair value	$	6,126	$	—	$	—	6,126
Pooled funds							17,623
Total fair value of plan assets							$	23,749


(1)	Represents mutual funds and commingled accounts which invest primarily in equities, but may also hold fixed income securities, cash and other investments. Commingled funds with publicly quoted prices and actively traded are classified as Level 1 investments.

Pooled funds are measured using the net asset value (“NAV”) as a practical expedient for fair value as permissible under the accounting standard for fair value measurements and have not been categorized in the fair value hierarchy in accordance with ASU 2015-07, “Fair Value Measurement (Topic 820): Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent).” Pooled fund NAVs are provided by the trustee and are determined by reference to the fair value of the underlying securities of the trust, less its liabilities, which are valued primarily through the use of directly or indirectly observable inputs. Depending on the pooled fund, underlying securities may include marketable equity securities or fixed income securities.

The assumptions used to determine the benefit obligations and expense for our two plans are presented in the tables below. The expected long-term return on assets, noted below, represents an estimate of long-term returns on investment portfolios consisting of a mixture of fixed income and equity securities. The estimated cash flows from the plans for all future years are determined based on the plans’ population at the measurement date. We used the expected benefit payouts from the plans for each year into the future and discounted them back to the present using the Wells Fargo yield curve rate for that duration.

The weighted-average assumptions used to determine the net periodic benefit costs under the two plans were as follows:



	Years Ended December 31,
	2019		2018		2017
Discount rate used to determine pension expense
Pension Plan	3.22	%	3.64	%	4.18	%
LaBarge Retirement Plan	2.85	%	3.40	%	3.75	%

The weighted-average assumptions used to determine the benefit obligations under the two plans were as follows:



	December 31,
	2019		2018		2017
Discount rate used to determine value of obligations
Pension Plan	4.23	%	4.23	%	3.64	%
LaBarge Retirement Plan	4.00	%	4.00	%	3.40	%
Long-term rate of return - Pension Plan only	7.00	%	7.00	%	7.00	%

The following benefit payments under both plans, which reflect expected future service, as appropriate, are expected to be paid:



	(In thousands)
	Pension Plan		LaBarge Retirement Plan
2020	$	1,252	$	589
2021	1,339		569
2022	1,452		545
2023	1,495		517
2024	1,607		486
2025 - 2029	9,002		2,012

Our funding policy is to contribute cash to our plans so that the minimum contribution requirements established by government funding and taxing authorities are met. We expect to make contributions of $0.9 million to the plans in 2020.

Income Taxes

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Income Taxes

Our pre-tax income attributable to foreign operations was not material. The provision for income tax (benefit) expense consisted of the following:



	(In thousands) Years Ended December 31,
	2019			2018			2017
Current tax expense
Federal	$	5,802		$	474		$	2,387
State	1,067			1,260			525
	6,869			1,734			2,912
Deferred tax (benefit) expense
Federal	(650		)	(789		)	(15,515		)
State	(917		)	291			135
	(1,567		)	(498		)	(15,380		)
Income tax expense (benefit)	$	5,302		$	1,236		$	(12,468	)

On December 22, 2017, the U. S. enacted the Tax Cuts and Jobs Act (the “2017 Tax Act”) which, among a broad range of tax reform measures, reduced the U.S. corporate tax rate from 35.0% to 21.0% effective January 1, 2018. The reduction in the corporate tax rate required the federal portion of our deferred tax assets and liabilities at December 31, 2017 to be re-measured at the enacted tax rate expected to apply when the temporary differences are to be realized or settled using 21.0%. As a result, we recorded a provisional deferred income tax benefit of $13.0 million related to the re-measurement for the year ended December 31, 2017. SEC Staff Accounting Bulletin No. 118, “Income Tax Accounting Implications of the Tax Cuts and Jobs Act” (“SAB 118”), allowed us to record provisional amounts during a measurement period not to extend beyond one year of the enactment date. Since the 2017 Tax Act was passed late in the fourth quarter of 2017, and ongoing tax guidance and accounting interpretation were expected during 2018, we considered the accounting of the deferred tax re-measurement and other items to be incomplete as of December 31, 2017. Based on our review of proposed tax regulations and related guidance issued and available as of December 22, 2018, we determined that no refinements were needed to the tax positions and provisional amounts recorded in the fourth quarter of 2017 and finalized the accounting of the tax effects of the 2017 Tax Act as of December 31, 2018.

We recognized net income tax benefits from deductions of share-based payments in excess of compensation cost recognized for financial reporting purposes of $0.8 million, $0.2 million, and $0.6 million for the years ended December 31, 2019, 2018, and 2017, respectively.

Deferred tax (liabilities) assets were comprised of the following:



	(In thousands) December 31,
	2019			2018
Deferred tax assets:
Accrued expenses	$	776		$	704
Allowance for doubtful accounts	314			267
Contract overrun reserves	1,004			1,263
Deferred compensation	94			302
Employment-related accruals	5,049			4,252
Environmental reserves	494			479
Federal tax credit carryforwards	84			288
Inventory reserves	2,334			1,757
Pension obligation	2,552			2,324
Federal and state net operating loss carryforwards	6,251			51
State tax credit carryforwards	8,900			9,075
Stock-based compensation	1,672			1,661
Workers’ compensation	43			51
Other	1,409			1,538
Total gross deferred tax assets	30,976			24,012
Valuation allowance	(9,375		)	(9,083		)
Total gross deferred tax assets, net of valuation allowance	21,601			14,929
Deferred tax liabilities:
Deferred revenue	(256		)	(649		)
Depreciation	(8,852		)	(7,951		)
Goodwill	(4,109		)	(3,963		)
Intangibles	(24,749		)	(19,905		)
Prepaid insurance	(346		)	(223		)
Total gross deferred tax liabilities	(38,312		)	(32,691		)
Net deferred tax liabilities	$	(16,711	)	$	(17,762	)

We have federal and state tax net operating losses of $22.5 million and $26.5 million, respectively, as of December 31, 2019. The federal net operating losses acquired from the acquisition of Nobles are subject to an annual limitation under Internal Revenue Code Section 382; however, we expect to fully realize them under ASC Subtopic 740-10 before they begin to expire in 2033. The state net operating loss carryforwards include $16.9 million that is not expected to be realized due to various limitations and has been reduced by a valuation allowance. If not realized, the state net operating loss carryforwards will begin to expire in 2027.

We have federal and state tax credit carryforwards of $0.1 million and $12.8 million, respectively, as of December 31, 2019. A valuation allowance of $10.7 million has been provided on state tax credit carryforwards that are not expected to be realized under ASC Subtopic 740-10. If not realized, the federal and state tax credit carryforwards will begin to expire in 2020.

We believe it is more likely than not that we will generate sufficient taxable income to realize the benefit of the remaining deferred tax assets.

The principal reasons for the variation between the statutory and effective tax rates were as follows:



	Years Ended December 31,
	2019	2018	2017
Statutory federal income tax rate	21.0%	21.0%	35.0%
State income taxes (net of federal benefit)	3.6	5.3	2.5
Foreign derived intangible income deduction	(1.2)	—	—
Qualified domestic production activities	—	—	(2.6)
Stock-based compensation expense	(2.1)	(1.9)	(8.2)
Research and development tax credits	(7.8)	(32.0)	(50.6)
Other tax credits	—	(1.2)	(7.5)
Changes in valuation allowance	(1.6)	0.7	10.6
Non-deductible book expenses	3.9	8.2	1.1
Changes in deferred tax assets	(2.2)	12.1	15.4
Re-measurement of deferred taxes for 2017 Tax Act	—	—	(171.3)
Changes in tax reserves	1.2	1.2	11.4
Other	(0.8)	(1.4)	0.4
Effective income tax (benefit) rate	14.0%	12.0%	(163.8)%

As a result of the 2017 Tax Act, we began utilizing the enacted U.S. corporate rate of 21.0% for the tax year 2018 and beyond.

Our total amount of unrecognized tax benefits was $5.7 million, $5.3 million, and $5.3 million at December 31, 2019, 2018, and 2017, respectively. We record interest and penalty charge, if any, related to uncertain tax positions as a component of tax expense and unrecognized tax benefits. The amounts accrued for interest and penalty charges as of December 31, 2019, 2018, and 2017 were not significant. If recognized, $4.0 million would affect the effective income tax rate. As a result of statute of limitations set to expire in 2020, we expect decreases to our unrecognized tax benefits of approximately $2.0 million in the next twelve months.

A reconciliation of the beginning and ending amount of unrecognized tax benefits was as follows:



	(In thousands) Years Ended December 31,
	2019			2018			2017
Balance at January 1,	$	5,283		$	5,271		$	3,036
Additions for tax positions related to the current year	408			419			422
Additions for tax positions related to prior years	—			92			1,953
Reductions for tax positions related to prior years	(28		)	(499		)	(99		)
Reductions for lapse of statute of limitations	—			—			(41		)
Balance at December 31,	$	5,663		$	5,283		$	5,271

We file U.S. Federal and state income tax returns. We are subject to examination by the Internal Revenue Service (“IRS”) for tax years after 2015 and by state taxing authorities for tax years after 2014. While we are no longer subject to examination prior to those periods, carryforwards generated prior to those periods may still be adjusted upon examination by the IRS or state taxing authorities if they either have been or will be used in a subsequent period. We believe we have adequately accrued for tax deficiencies or reductions in tax benefits, if any, that could result from the examination and all open audit years.

Contingencies	12 Months Ended
Contingencies	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies Structural Systems has been directed by California environmental agencies to investigate and take corrective action for groundwater contamination at its facilities located in El Mirage and Monrovia, California. Based on currently available information, Ducommun has established an accrual for its estimated liability for such investigation and corrective action of $1.5 million at December 31, 2019, which is reflected in other long-term liabilities on its consolidated balance sheet. Structural Systems also faces liability as a potentially responsible party for hazardous waste disposed at landfills located in Casmalia and West Covina, California. Structural Systems and other companies and government entities have entered into consent decrees with respect to these landfills with the United States Environmental Protection Agency and/or California environmental agencies under which certain investigation, remediation and maintenance activities are being performed. Based on currently available information, Ducommun preliminarily estimates that the range of its future liabilities in connection with the landfill located in West Covina, California is between $0.4 million and $3.1 million. Ducommun has established an accrual for its estimated liability in connection with the West Covina landfill of $0.4 million at December 31, 2019, which is reflected in other long-term liabilities on its consolidated balance sheet. Ducommun’s ultimate liability in connection with these matters will depend upon a number of factors, including changes in existing laws and regulations, the design and cost of construction, operation and maintenance activities, and the allocation of liability among potentially responsible parties. In the normal course of business, Ducommun and its subsidiaries are defendants in certain other litigation, claims and inquiries, including matters relating to environmental laws. In addition, Ducommun makes various commitments and incurs contingent liabilities. While it is not feasible to predict the outcome of these matters, Ducommun does not presently expect that any sum it may be required to pay in connection with these matters would have a material adverse effect on its consolidated financial position, results of operations or cash flows.

Major Customers and Concentrations of Credit Risk

12 Months Ended

Dec. 31, 2019

Risks and Uncertainties [Abstract]

Major Customers and Concentrations of Credit Risk

We provide proprietary products and services to the Department of Defense and various United States Government agencies, and most of the aerospace and aircraft manufacturers who receive contracts directly from the U.S. Government as an original equipment manufacturer (“Primes”). In addition, we also service technology-driven markets in the industrial, medical and other end-use markets. As a result, we have significant net revenues from certain customers. Accounts receivable were diversified over a number of different commercial, military and space programs and were made by both operating segments. Net revenues from our top ten customers, including The Boeing Company (“Boeing”), Lockheed Martin Corporation (“Lockheed Martin”), Raytheon Company (“Raytheon”), and Spirit AeroSystems Holdings, Inc. (“Spirit”), represented the following percentages of total net sales:



	Years Ended December 31,
	2019		2018		2017
Boeing	16.6	%	17.0	%	16.3	%
Lockheed Martin	4.0	%	4.4	%	5.5	%
Raytheon	11.0	%	11.7	%	13.5	%
Spirit	12.2	%	9.5	%	8.2	%
Top ten customers⁽¹⁾	63.5	%	62.9	%	62.5	%

(1) Includes Boeing, Lockheed Martin, Raytheon, and Spirit.

Boeing, Lockheed Martin, Raytheon, and Spirit represented the following percentages of total accounts receivable:



	December 31,
	2019		2018
Boeing	5.9	%	8.0	%
Lockheed Martin	0.8	%	2.5	%
Raytheon	3.3	%	3.2	%
Spirit	2.0	%	—	%

In 2019, 2018 and 2017, net revenues from foreign customers based on the location of the customer were $81.6 million, $71.9 million and $57.2 million, respectively. No net revenues from a foreign country were greater than 4.0% of total net revenues in 2019, 2018, and 2017. We have manufacturing facilities in Thailand and Mexico. Our net revenues, profitability and identifiable long-lived assets attributable to foreign revenues activity were not material compared to our net revenues, profitability and identifiable long-lived assets attributable to our domestic operations during 2019, 2018, and 2017. We are not subject to any significant foreign currency risks as all our sales are made in United States dollars.

Business Segment Information

12 Months Ended

Dec. 31, 2019

Segment Reporting [Abstract]

Business Segment Information

We supply products and services primarily to the aerospace and defense industries. Our subsidiaries are organized into two strategic businesses, Electronic Systems and Structural Systems, each of which is an operating segment as well as a reportable segment.

Financial information by reportable segment was as follows:



	(In thousands) Years Ended December 31,
	2019			2018			2017
Net Revenues
Electronic Systems	$	360,373		$	337,868		$	316,723
Structural Systems	360,715			291,439			241,460
Total Net Revenues	$	721,088		$	629,307		$	558,183
Segment Operating Income (Loss) ^(1)(2)(3)
Electronic Systems	$	38,613		$	30,916		$	31,236
Structural Systems	46,836			19,063			5,790
	85,449			49,979			37,026
Corporate General and Administrative Expenses ⁽⁴⁾	(29,216		)	(26,061		)	(21,392		)
Operating Income	$	56,233		$	23,918		$	15,634
Depreciation and Amortization Expenses
Electronic Systems	$	14,170		$	14,223		$	13,888
Structural Systems	13,663			10,525			8,860
Corporate Administration	472			548			97
Total Depreciation and Amortization Expenses	$	28,305		$	25,296		$	22,845
Capital Expenditures
Electronic Systems	$	5,508		$	6,719		$	5,019
Structural Systems	13,338			9,104			20,679
Corporate Administration	—			514			775
Total Capital Expenditures	$	18,846		$	16,337		$	26,473


(1)	The results for 2019 includes Nobles’ results of operations which have been included in our consolidated statements of income since the date of acquisition as part of the Structural Systems segment. See Note 3.


(2)	The results for 2018 includes CTP’s results of operations which have been included in our consolidated statements of income since the date of acquisition as part of the Structural Systems segment. See Note 3.


(3)	The results for 2017 includes LDS’ results of operations which have been included in our consolidated statements of income since the date of acquisition as part of the Electronic Systems segment.


(4)	Includes cost not allocated to either the Electronic Systems or Structural Systems operating segments.

Segment assets include assets directly identifiable with each segment. Corporate assets include assets not specifically identified with a business segment, including cash. The following table summarizes our segment assets for 2019 and 2018:



	(In thousands) December 31,
	2019		2018
Total Assets
Electronic Systems	$	411,981	$	405,743
Structural Systems	328,718		220,993
Corporate Administration	49,730		18,003
Total Assets	$	790,429	$	644,739
Goodwill and Intangibles
Electronic Systems	$	210,453	$	219,872
Structural Systems	98,826		28,277
Total Goodwill and Intangibles	$	309,279	$	248,149

On October 8, 2019, we acquired 100.0% of the outstanding equity interests of Nobles for a purchase price of $77.0 million, net of cash acquired. We allocated the gross purchase price of $77.3 million to the assets acquired and liabilities assumed at preliminary estimated fair values. The excess of the purchase price over the aggregate fair values of the net assets was recorded as goodwill. See Note 3.

In April 2018, we acquired 100.0% of the outstanding equity interests of CTP for a purchase price of $30.7 million, net of cash acquired. We allocated the gross purchase price of $30.8 million to the assets acquired and liabilities assumed at estimated fair values. The excess of the purchase price over the aggregate fair values of the net assets was recorded as goodwill. See Note 3.

In September 2017, we acquired 100.0% of the outstanding equity interests of LDS for a purchase price of $60.0 million, net of cash acquired. We allocated the gross purchase price of $62.0 million to the assets acquired and liabilities assumed at estimated fair values. The excess of the purchase over the aggregate fair values was recorded as goodwill.

Supplemental Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Supplementary Quarterly Financial Data (Unaudited)

Supplemental Quarterly Financial Data (Unaudited)



	(In thousands, except per share amounts)
	Three Months Ended 2019								Three Months Ended 2018
	Dec 31		Sep 28		Jun 29		Mar 30		Dec 31		Sep 29		Jun 30		Mar 31
Net Revenues	$	186,926	$	181,101	$	180,495	$	172,566	$	164,183	$	159,842	$	154,827	$	150,455
Gross Profit	40,111		38,327		38,065		35,694		32,697		31,116		32,028		26,755
Income Before Taxes	9,848		10,240		9,178		8,497		1,791		4,290		1,833		2,357
Income Tax Expense (Benefit)	977		1,937		1,363		1,025		1,118		119		242		(243		)
Net Income	$	8,871	$	8,303	$	7,815	$	7,472	$	673	$	4,171	$	1,591	$	2,600
Earnings Per Share
Basic earnings per share	$	0.77	$	0.72	$	0.68	$	0.65	$	0.06	$	0.37	$	0.14	$	0.23
Diluted earnings per share	$	0.75	$	0.70	$	0.66	$	0.64	$	0.06	$	0.36	$	0.14	$	0.22

In the fourth quarter of 2019, we acquired 100.0% of the outstanding equity interests of Nobles and Nobles’ results of operations have been included in our consolidated statements of income since the date of acquisition as part of the Structural Systems segment. See Note 3.

In the fourth quarter of 2018, we recorded restructuring charges of $3.8 million as part of a restructuring plan that commenced during the fourth quarter of 2017. See Note 4.

In the third quarter of 2018, we recorded restructuring charges of $3.4 million as part of a restructuring plan that commenced during the fourth quarter of 2017. See Note 4.

In the second quarter of 2018, we acquired 100.0% of the outstanding equity interests of CTP and CTP’s results of operations have been included in our consolidated statements of income since the date of acquisition as part of the Structural Systems segment. See Note 3. In addition, we recorded restructuring charges of $5.4 million as part of a restructuring plan that commenced during the fourth quarter of 2017. See Note 4.

In the first quarter of 2018, we recorded restructuring charges of $2.2 million as part of a restructuring plan that commenced during the fourth quarter of 2017. See Note 4.

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Description of Business

Basis of Presentation

Changes in Accounting Policies and Recent Accounting Pronouncements

Changes in Accounting Policies

Recent Accounting Pronouncements

New Accounting Guidance Adopted in 2019


•	July 2018, the FASB issued ASU 2018-11, “Leases (Topic 842): Targeted Improvements” (“ASU 2018-11”); and


•	July 2018, the FASB issued ASU 2018-10, “Codification Improvements to Topic 842, Leases” (“ASU 2018-10”)

All the new guidance was effective for us beginning January 1, 2019. The cumulative impact to our retained earnings at January 1, 2019 was a net decrease of $0.3 million. See Note 2.

Recently Issued Accounting Standards

Use of Estimates

Reclassifications

Certain prior period amounts have been reclassified to conform to current year’s presentation.

Fair Value

Cash Equivalents

Derivative Instruments

Allowance for Doubtful Accounts

Inventories

Production Cost of Contracts and Revenue Recognition

Production Cost of Contracts

Revenue Recognition

The impact of adjustments in contract estimates on our operating earnings can be reflected in either operating costs and expenses or revenue.

Net cumulative catch-up adjustments on profit recorded were not material for the year ended December 31, 2019.

Contract Assets and Contract Liabilities

Property and Equipment and Depreciation

Goodwill and Indefinite-Lived Intangible Asset

Goodwill

Other Intangible Assets

Accumulated Other Comprehensive Loss

Provision for Estimated Losses on Contracts

Income Taxes

Litigation and Commitments

Environmental Liabilities

Accounting for Stock-Based Compensation

Earnings (Loss) per Share

Earnings Per Share

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Schedule of Cash Flow, Supplemental Disclosures

Supplemental Cash Flow Information



	(Dollars in thousands) Years Ended December 31,
	2019		2018		2017
Interest paid	$	16,474	$	11,573	$	7,307
Taxes paid	$	5,699	$	316	$	3,125
Non-cash activities:
Purchases of property and equipment not paid	$	1,380	$	824	$	2,104

Contract with Customer, Asset and Liability

Contract assets and contract liabilities from revenue contracts with customers are as follows:



	(Dollars in thousands)
	December 31, 2019		December 31, 2018
Contract assets	$	106,670	$	86,665
Contract liabilities	$	14,517	$	17,145

Disaggregation of Revenue

In addition to the revenue categories disclosed above, the following table reflects our revenue disaggregated by major end-use market:



				(Dollars in thousands) Years Ended December 31,				% of Net Revenues
	Change			2019		2018		2019		2018
Consolidated Ducommun
Military and space	$	46,208		$	323,800	$	277,592	44.9	%	44.1	%
Commercial aerospace	44,981			348,503		303,522		48.3	%	48.2	%
Industrial	592			48,785		48,193		6.8	%	7.7	%
Total	$	91,781		$	721,088	$	629,307	100.0	%	100.0	%

Electronic Systems
Military and space	$	28,526		$	244,245	$	215,719	67.8	%	63.8	%
Commercial aerospace	(6,613		)	67,343		73,956		18.7	%	21.9	%
Industrial	592			48,785		48,193		13.5	%	14.3	%
Total	$	22,505		$	360,373	$	337,868	100.0	%	100.0	%

Structural Systems
Military and space	$	17,682		$	79,555	$	61,873	22.1	%	21.2	%
Commercial aerospace	51,594			281,160		229,566		77.9	%	78.8	%
Total	$	69,276		$	360,715	$	291,439	100.0	%	100.0	%

Weighted Average Number of Shares Outstanding Used to Compute Earnings Per Share

The net income and weighted-average common shares outstanding used to compute earnings per share were as follows:



	(In thousands, except per share data) Years Ended December 31,
	2019		2018		2017
Net income	$	32,461	$	9,035	$	20,077
Weighted-average number of common shares outstanding
Basic weighted-average common shares outstanding	11,518		11,390		11,290
Dilutive potential common shares	274		269		268
Diluted weighted-average common shares outstanding	11,792		11,659		11,558
Earnings per share
Basic	$	2.82	$	0.79	$	1.78
Diluted	$	2.75	$	0.77	$	1.74

Weighted Average Number of Shares Outstanding Excluded from Computation of Diluted Earnings



	(In thousands) Years Ended December 31,
	2019	2018	2017
Stock options and stock units	127	208	126

Adoption of Accounting Standards Codification 842 (Tables)

12 Months Ended

Dec. 31, 2019

Leases [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Policies

The net impact to the various captions on our January 1, 2019 opening consolidated balance sheets was as follows:



	(Dollars in thousands)
	December 31, 2018					January 1, 2019
Unaudited Consolidated Balance Sheets	Balances Without Adoption of ASC 842		Effect of Adoption			Balances With Adoption of ASC 842
Assets
Other current assets	$	6,531	$	(208	)	$	6,323
Operating lease right-of-use assets	$	—	$	18,985		$	18,985
Non-current deferred income taxes	$	308	$	5		$	313
Other assets	$	5,155	$	254		$	5,409
Liabilities
Operating lease liabilities	$	—	$	2,544		$	2,544
Accrued and other liabilities	$	37,786	$	(329	)	$	37,457
Non-current operating lease liabilities	$	—	$	18,117		$	18,117
Non-current deferred income taxes	$	18,070	$	(76	)	$	17,994
Other long-term liabilities	$	14,441	$	(956	)	$	13,485
Shareholders’ Equity
Retained earnings	$	180,356	$	(264	)	$	180,092

Lease, Cost

The components of lease expense for the year ended December 31, 2019 were as follows:



	(In thousands)
Operating leases expense	$	3,963

Finance leases expense:
Amortization of right-of-use assets	$	216
Interest on lease liabilities	42
Total finance lease expense	$	258

Supplemental cash flow information related to leases for the year ended December 31, 2019 was as follows:



	(In thousands)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	4,030
Operating cash flows from finance leases	$	39
Financing cash flows from finance leases	$	169

Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$	2,574
Finance leases	$	483

The weighted average remaining lease terms as of December 31, 2019 were as follows:



	(In years)
Operating leases	7
Finance leases	4

The weighted average discount rates as of December 31, 2019 were as follows:



Operating leases	6.5	%
Finance leases	6.5	%

Finance Lease, Liability, Maturity

Maturity of operating and finance lease liabilities are as follows:



	(In thousands)
	Operating Leases		Finance Leases
2020	$	4,178	$	242
2021	4,147		229
2022	3,756		92
2023	3,425		53
2024	3,003		26
Thereafter	7,022		46
Total lease payments	25,531		688
Less imputed interest	5,010		74
Total	$	20,521	$	614

Lessee, Operating Lease, Liability, Maturity

Maturity of operating and finance lease liabilities are as follows:



	(In thousands)
	Operating Leases		Finance Leases
2020	$	4,178	$	242
2021	4,147		229
2022	3,756		92
2023	3,425		53
2024	3,003		26
Thereafter	7,022		46
Total lease payments	25,531		688
Less imputed interest	5,010		74
Total	$	20,521	$	614

Schedule of Future Minimum Rental Payments for Operating Leases

As previously disclosed in our 2018 Annual Report on Form 10-K and under the previous accounting maturities of lease liabilities were as follows as of December 31, 2018:



	(In thousands)
2019	$	3,680
2020	3,405
2021	2,789
2022	1,404
2023	980
Thereafter	580
Total	$	12,838

Business Combinations (Tables)

12 Months Ended

Dec. 31, 2019

Business Combinations [Abstract]

Schedule of Business Acquisitions, by Acquisition

The following table summarizes the preliminary estimated fair value of the assets acquired and liabilities assumed at the date of acquisition (in thousands):



	Estimated Fair Value
Cash	$	658
Accounts receivable	1,880
Inventories	2,866
Other current assets	168
Property and equipment	2,319
Intangible assets	37,700
Goodwill	34,860
Other non-current assets	675
Total assets acquired	81,126
Current liabilities	(2,285		)
Net non-current deferred tax liability	(861		)
Other non-current liabilities	(675		)
Total liabilities assumed	(3,821		)
Total purchase price allocation	$	77,305

Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination



	Useful Life (In years)	Estimated Fair Value (In thousands)
Intangible assets:
Customer relationships	15-16	$	34,700
Trade names and trademarks	15	3,000
		$	37,700

Restructuring Activities (Tables)

12 Months Ended

Dec. 31, 2019

Restructuring and Related Activities [Abstract]

Schedule of Restructuring Activities

Our restructuring activities for 2019 were as follows (in thousands):



	December 31, 2018		2019											December 31, 2019
	Balance		Charges		Cash Payments			Adoption of ASC 842 Adjustment			Change in Estimates			Balance
Severance and benefits	$	2,631	$	—	$	(2,631	)	$	—		$	—		$	—
Lease termination	861		—		(126		)	(735		)	—			—
Professional service fees	43		—		(43		)	—			—			—
Other	416		—		(416		)	—			—			—
Total charged to restructuring charges	3,951		—		(3,216		)	(735		)	—			—
Inventory reserve	50		—		—			—			(50		)	—
Total charged to cost of sales	50		—		—			—			(50		)	—
Ending balance	$	4,001	$	—	$	(3,216	)	$	(735	)	$	(50	)	$	—

Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The carrying amounts of goodwill, by operating segment, for the years ended December 31, 2019 and 2018 were as follows:



	(In thousands)
	Electronic Systems			Structural Systems		Consolidated Ducommun
Gross goodwill	$	199,157		$	18,622	$	217,779
Accumulated goodwill impairment	(81,722		)	—		(81,722		)
Balance at December 31, 2018	117,435			18,622		136,057
Goodwill from acquisition during the period	—			34,860		34,860
Balance at December 31, 2019	$	117,435		$	53,482	$	170,917

Other Intangible Assets

Intangible assets are as follows:



		(In thousands)
		December 31, 2019						December 31, 2018
	Wtd. Avg Life (Yrs)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Finite-lived assets
Customer relationships	17	$	221,900	$	88,838	$	133,062	$	187,200	$	77,824	$	109,376
Trade names and trademarks	14	5,500		450		5,050		2,500		193		2,307
Contract renewal	14	1,845		1,757		88		1,845		1,625		220
Technology	15	400		238		162		400		211		189
Total		$	229,645	$	91,283	$	138,362	$	191,945	$	79,853	$	112,092

The carrying amount of other intangible assets by operating segment as of December 31, 2019 and 2018 was as follows:



	(In thousands)
	December 31, 2019						December 31, 2018
	Gross		Accumulated Amortization		Net Carrying Value		Gross		Accumulated Amortization		Net Carrying Value
Other intangible assets
Electronic Systems	$	164,545	$	71,527	$	93,018	$	164,545	$	62,108	$	102,437
Structural Systems	65,100		19,756		45,344		27,400		17,745		9,655
Total	$	229,645	$	91,283	$	138,362	$	191,945	$	79,853	$	112,092

Summary of Future Amortization Expense

Future amortization expense by operating segment is expected to be as follows:



	(In thousands)
	Electronic Systems		Structural Systems		Consolidated Ducommun
2020	$	9,348	$	3,719	$	13,067
2021	9,287		3,614		12,901
2022	9,288		3,553		12,841
2023	9,287		3,495		12,782
2024	9,288		3,260		12,548
Thereafter	46,520		27,703		74,223
	$	93,018	$	45,344	$	138,362

Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2019

Debt Disclosure [Abstract]

Long Term Debt Summary

Long-term debt and the current period interest rates were as follows:



	(In thousands) December 31,
	2019			2018
Term loans	$	310,000		$	233,000
Revolving credit facility	—			—
Total debt	310,000			233,000
Less current portion	7,000			2,330
Total long-term debt, less current portion	303,000			230,670
Less debt issuance costs - term loans	2,113			1,802
Total long-term debt, net of debt issuance costs - term loans	$	300,887		$	228,868
Debt issuance costs - revolving credit facility ⁽¹⁾	$	1,894		$	1,907
Weighted-average interest rate	6.87		%	4.71		%

(1) Included as part of other assets.

Future Long Term Debt Payments

Future long-term debt payments at December 31, 2019 were as follows:



	(In thousands)
2020	$	7,000
2021	7,000
2022	7,000
2023	7,000
2024	112,000
Thereafter	170,000
Total	$	310,000

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21521-112644

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21538-112644

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

Summary of Option Activity

Stock option activity for the year ended December 31, 2019 were as follows:



	Number of Stock Options		Weighted- Average Exercise Price Per Share		Weighted-Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2019	363,225		$	28.33
Granted	189,170		$	41.97
Exercised	(80,693	)	$	24.97
Expired	(2,857	)	$	20.09
Forfeited	(22,027	)	$	29.99
Outstanding at December 31, 2019	446,818		$	34.68	7.7	$	7,319
Exerciseable at December 31, 2019	96,947		$	27.70	5.3	$	2,265

Schedule of Nonvested Options Activity

Changes in nonvested stock options for the year ended December 31, 2019 were as follows:



	Number of Stock Options		Weighted- Average Grant Date Fair Value
Nonvested at January 1, 2019	292,013		$	12.20
Granted	189,170		$	15.95
Vested	(109,285	)	$	11.95
Forfeited	(22,027	)	$	10.24
Nonvested at December 31, 2019	349,871		$	14.33

Schedule of Assumptions Used

The assumptions used to compute the fair value of stock option grants under the Stock Incentive Plans for years ended December 31, 2019, 2018, and 2017 were as follows:



	Years Ended December 31,
	2019		2018		2017
Risk-free interest rate	1.92	%	2.65	%	1.75	%
Expected volatility	40.44	%	53.66	%	50.37	%
Expected dividends	—		—		—
Expected term (in months)	60		36		48

The weighted-average assumptions used to determine the net periodic benefit costs under the two plans were as follows:



	Years Ended December 31,
	2019		2018		2017
Discount rate used to determine pension expense
Pension Plan	3.22	%	3.64	%	4.18	%
LaBarge Retirement Plan	2.85	%	3.40	%	3.75	%

The weighted-average assumptions used to determine the benefit obligations under the two plans were as follows:



	December 31,
	2019		2018		2017
Discount rate used to determine value of obligations
Pension Plan	4.23	%	4.23	%	3.64	%
LaBarge Retirement Plan	4.00	%	4.00	%	3.40	%
Long-term rate of return - Pension Plan only	7.00	%	7.00	%	7.00	%

Schedule of Restricted Stock Units Activity

Restricted stock unit activity for the year ended December 31, 2019 was as follows:



	Number of Restricted Stock Units		Weighted- Average Grant Date Fair Value
Outstanding at January 1, 2019	157,937		$	28.96
Granted	62,520		$	41.04
Vested	(85,279	)	$	27.94
Forfeited	(7,755	)	$	30.80
Outstanding at December 31, 2019	127,423		$	36.22

Schedule of Performance-based Units Activity

Performance stock activity for the year ended December 31, 2019 was as follows:



	Number of Performance Stock Units		Weighted- Average Grant Date Fair Value
Outstanding at January 1, 2019	236,700		$	26.21
Granted	58,178		$	43.80
Vested	(85,504	)	$	19.05
Forfeited	(11,800	)	$	33.21
Outstanding at December 31, 2019	197,574		$	33.98

Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2019

Retirement Benefits [Abstract]

Components of Net Periodic Pension Cost

The components of net periodic pension cost for the Pension Plan and LaBarge Retirement Plan in aggregate are as follows:



	(In thousands) Years Ended December 31,
	2019			2018			2017
Service cost	$	503		$	601		$	531
Interest cost	1,388			1,268			1,329
Expected return on plan assets	(1,644		)	(1,784		)	(1,530		)
Amortization of actuarial losses	885			743			810
Net periodic pension cost	$	1,132		$	828		$	1,140

Reclassification out of Accumulated Other Comprehensive Income

The components of the reclassifications of net actuarial losses from accumulated other comprehensive loss to net income for 2019 were as follows:



	(In thousands) Year Ended December 31,
	2019
Amortization of actuarial loss - total before tax ⁽¹⁾	$	885
Tax benefit	(209		)
Net of tax	$	676


(1)	The amortization expense is included in the computation of periodic pension cost and is a decrease to net income upon reclassification from accumulated other comprehensive loss.

Obligation and Funded Status of Defined Benefit Pension Plan and Retirement Plan

The obligations, fair value of plan assets, and funded status of both plans are as follows:



	(In thousands) December 31,
	2019			2018
Change in benefit obligation⁽¹⁾
Beginning benefit obligation (January 1)	$	33,951		$	36,002
Service cost	503			601
Interest cost	1,388			1,268
Actuarial (gain) loss	4,769			(2,415		)
Benefits paid	(1,526		)	(1,505		)
Ending benefit obligation (December 31)	$	39,085		$	33,951
Change in plan assets
Beginning fair value of plan assets (January 1)	$	23,749		$	25,646
Return on assets	4,347			(1,951		)
Employer contribution	1,873			1,559
Benefits paid	(1,526		)	(1,505		)
Ending fair value of plan assets (December 31)	$	28,443		$	23,749
Funded status (underfunded)	$	(10,642	)	$	(10,202	)
Amounts recognized in the consolidated balance sheet
Current liabilities	$	—		$	580
Non-current liabilities	$	10,642		$	9,622
Unrecognized loss included in accumulated other comprehensive loss
Beginning unrecognized loss, before tax (January 1)	$	9,485		$	8,908
Amortization	(885		)	(743		)
Liability (gain) loss	4,769			(2,415		)
Asset loss (gain)	(2,709		)	3,735
Ending unrecognized loss, before tax (December 31)	10,660			9,485
Tax impact	(2,544		)	(2,263		)
Unrecognized loss included in accumulated other comprehensive loss, net of tax	$	8,116		$	7,222


(1)	Projected benefit obligation equals the accumulated benefit obligation for the plans.

Company's Pension Plan Asset Allocation, by Asset Category

Our Pension Plan asset allocations at December 31, 2019 and 2018, by asset category, were as follows:



	December 31,
	2019		2018
Equity securities	69	%	57	%
Cash and equivalents	1	%	1	%
Debt securities	30	%	42	%
Total⁽¹⁾	100	%	100	%


(1)	Our overall investment strategy is to achieve an asset allocation within the following ranges to achieve an appropriate rate of return relative to risk.



Cash	0-10%
Fixed income securities	15-75%
Equities	30-80%



	(In thousands) Year Ended December 31, 2019
	Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	232	$	—	$	—	$	232
Fixed income securities	3,247		—		—		3,247
Equities⁽¹⁾	2,645		—		—		2,645
Other investments	1,552		—		—		1,552
Total plan assets at fair value	$	7,676	$	—	$	—	7,676
Pooled funds							20,767
Total fair value of plan assets							$	28,443



	(In thousands) Year Ended December 31, 2018
	Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	153	$	—	$	—	$	153
Fixed income securities	3,647		—		—		3,647
Equities⁽¹⁾	1,475		—		—		1,475
Other investments	851		—		—		851
Total plan assets at fair value	$	6,126	$	—	$	—	6,126
Pooled funds							17,623
Total fair value of plan assets							$	23,749


(1)	Represents mutual funds and commingled accounts which invest primarily in equities, but may also hold fixed income securities, cash and other investments. Commingled funds with publicly quoted prices and actively traded are classified as Level 1 investments.

Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost

The assumptions used to compute the fair value of stock option grants under the Stock Incentive Plans for years ended December 31, 2019, 2018, and 2017 were as follows:



	Years Ended December 31,
	2019		2018		2017
Risk-free interest rate	1.92	%	2.65	%	1.75	%
Expected volatility	40.44	%	53.66	%	50.37	%
Expected dividends	—		—		—
Expected term (in months)	60		36		48

The weighted-average assumptions used to determine the net periodic benefit costs under the two plans were as follows:



	Years Ended December 31,
	2019		2018		2017
Discount rate used to determine pension expense
Pension Plan	3.22	%	3.64	%	4.18	%
LaBarge Retirement Plan	2.85	%	3.40	%	3.75	%

The weighted-average assumptions used to determine the benefit obligations under the two plans were as follows:



	December 31,
	2019		2018		2017
Discount rate used to determine value of obligations
Pension Plan	4.23	%	4.23	%	3.64	%
LaBarge Retirement Plan	4.00	%	4.00	%	3.40	%
Long-term rate of return - Pension Plan only	7.00	%	7.00	%	7.00	%

Expected Future Benefit Payments Under Pension Plans

The following benefit payments under both plans, which reflect expected future service, as appropriate, are expected to be paid:



	(In thousands)
	Pension Plan		LaBarge Retirement Plan
2020	$	1,252	$	589
2021	1,339		569
2022	1,452		545
2023	1,495		517
2024	1,607		486
2025 - 2029	9,002		2,012

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Summary of Provision for Income Tax Expense (Benefit)

The provision for income tax (benefit) expense consisted of the following:



	(In thousands) Years Ended December 31,
	2019			2018			2017
Current tax expense
Federal	$	5,802		$	474		$	2,387
State	1,067			1,260			525
	6,869			1,734			2,912
Deferred tax (benefit) expense
Federal	(650		)	(789		)	(15,515		)
State	(917		)	291			135
	(1,567		)	(498		)	(15,380		)
Income tax expense (benefit)	$	5,302		$	1,236		$	(12,468	)

Summary of Deferred Tax Assets (Liabilities)

Deferred tax (liabilities) assets were comprised of the following:



	(In thousands) December 31,
	2019			2018
Deferred tax assets:
Accrued expenses	$	776		$	704
Allowance for doubtful accounts	314			267
Contract overrun reserves	1,004			1,263
Deferred compensation	94			302
Employment-related accruals	5,049			4,252
Environmental reserves	494			479
Federal tax credit carryforwards	84			288
Inventory reserves	2,334			1,757
Pension obligation	2,552			2,324
Federal and state net operating loss carryforwards	6,251			51
State tax credit carryforwards	8,900			9,075
Stock-based compensation	1,672			1,661
Workers’ compensation	43			51
Other	1,409			1,538
Total gross deferred tax assets	30,976			24,012
Valuation allowance	(9,375		)	(9,083		)
Total gross deferred tax assets, net of valuation allowance	21,601			14,929
Deferred tax liabilities:
Deferred revenue	(256		)	(649		)
Depreciation	(8,852		)	(7,951		)
Goodwill	(4,109		)	(3,963		)
Intangibles	(24,749		)	(19,905		)
Prepaid insurance	(346		)	(223		)
Total gross deferred tax liabilities	(38,312		)	(32,691		)
Net deferred tax liabilities	$	(16,711	)	$	(17,762	)

Principle Reasons for Variation Between Expected and Effective Tax Rate

The principal reasons for the variation between the statutory and effective tax rates were as follows:



	Years Ended December 31,
	2019	2018	2017
Statutory federal income tax rate	21.0%	21.0%	35.0%
State income taxes (net of federal benefit)	3.6	5.3	2.5
Foreign derived intangible income deduction	(1.2)	—	—
Qualified domestic production activities	—	—	(2.6)
Stock-based compensation expense	(2.1)	(1.9)	(8.2)
Research and development tax credits	(7.8)	(32.0)	(50.6)
Other tax credits	—	(1.2)	(7.5)
Changes in valuation allowance	(1.6)	0.7	10.6
Non-deductible book expenses	3.9	8.2	1.1
Changes in deferred tax assets	(2.2)	12.1	15.4
Re-measurement of deferred taxes for 2017 Tax Act	—	—	(171.3)
Changes in tax reserves	1.2	1.2	11.4
Other	(0.8)	(1.4)	0.4
Effective income tax (benefit) rate	14.0%	12.0%	(163.8)%

Reconciliation of Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits was as follows:



	(In thousands) Years Ended December 31,
	2019			2018			2017
Balance at January 1,	$	5,283		$	5,271		$	3,036
Additions for tax positions related to the current year	408			419			422
Additions for tax positions related to prior years	—			92			1,953
Reductions for tax positions related to prior years	(28		)	(499		)	(99		)
Reductions for lapse of statute of limitations	—			—			(41		)
Balance at December 31,	$	5,663		$	5,283		$	5,271

Major Customers and Concentrations of Credit Risk (Tables)

12 Months Ended

Dec. 31, 2019

Risks and Uncertainties [Abstract]

Schedule of Concentration Risk by Major Customers

Net revenues from our top ten customers, including The Boeing Company (“Boeing”), Lockheed Martin Corporation (“Lockheed Martin”), Raytheon Company (“Raytheon”), and Spirit AeroSystems Holdings, Inc. (“Spirit”), represented the following percentages of total net sales:



	Years Ended December 31,
	2019		2018		2017
Boeing	16.6	%	17.0	%	16.3	%
Lockheed Martin	4.0	%	4.4	%	5.5	%
Raytheon	11.0	%	11.7	%	13.5	%
Spirit	12.2	%	9.5	%	8.2	%
Top ten customers⁽¹⁾	63.5	%	62.9	%	62.5	%

(1) Includes Boeing, Lockheed Martin, Raytheon, and Spirit.

Boeing, Lockheed Martin, Raytheon, and Spirit represented the following percentages of total accounts receivable:



	December 31,
	2019		2018
Boeing	5.9	%	8.0	%
Lockheed Martin	0.8	%	2.5	%
Raytheon	3.3	%	3.2	%
Spirit	2.0	%	—	%

Business Segment Information (Tables)

12 Months Ended

Dec. 31, 2019

Segment Reporting [Abstract]

Financial Information by Reportable Segment

Financial information by reportable segment was as follows:



	(In thousands) Years Ended December 31,
	2019			2018			2017
Net Revenues
Electronic Systems	$	360,373		$	337,868		$	316,723
Structural Systems	360,715			291,439			241,460
Total Net Revenues	$	721,088		$	629,307		$	558,183
Segment Operating Income (Loss) ^(1)(2)(3)
Electronic Systems	$	38,613		$	30,916		$	31,236
Structural Systems	46,836			19,063			5,790
	85,449			49,979			37,026
Corporate General and Administrative Expenses ⁽⁴⁾	(29,216		)	(26,061		)	(21,392		)
Operating Income	$	56,233		$	23,918		$	15,634
Depreciation and Amortization Expenses
Electronic Systems	$	14,170		$	14,223		$	13,888
Structural Systems	13,663			10,525			8,860
Corporate Administration	472			548			97
Total Depreciation and Amortization Expenses	$	28,305		$	25,296		$	22,845
Capital Expenditures
Electronic Systems	$	5,508		$	6,719		$	5,019
Structural Systems	13,338			9,104			20,679
Corporate Administration	—			514			775
Total Capital Expenditures	$	18,846		$	16,337		$	26,473


(1)	The results for 2019 includes Nobles’ results of operations which have been included in our consolidated statements of income since the date of acquisition as part of the Structural Systems segment. See Note 3.


(2)	The results for 2018 includes CTP’s results of operations which have been included in our consolidated statements of income since the date of acquisition as part of the Structural Systems segment. See Note 3.


(3)	The results for 2017 includes LDS’ results of operations which have been included in our consolidated statements of income since the date of acquisition as part of the Electronic Systems segment.


(4)	Includes cost not allocated to either the Electronic Systems or Structural Systems operating segments.

Segment Assets

Corporate assets include assets not specifically identified with a business segment, including cash. The following table summarizes our segment assets for 2019 and 2018:



	(In thousands) December 31,
	2019		2018
Total Assets
Electronic Systems	$	411,981	$	405,743
Structural Systems	328,718		220,993
Corporate Administration	49,730		18,003
Total Assets	$	790,429	$	644,739
Goodwill and Intangibles
Electronic Systems	$	210,453	$	219,872
Structural Systems	98,826		28,277
Total Goodwill and Intangibles	$	309,279	$	248,149

Summary of Significant Accounting Policies - Narrative (Details)	1 Months Ended	12 Months Ended
	Apr. 30, 2018 USD ($)	Dec. 31, 2019 USD ($) Segment	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2018 USD ($)
Significant Accounting Policies [Line Items]
Number of reportable segments \| Segment		2
Production cost of contracts		$ 9,402,000		$ 11,679,000
Goodwill		170,917,000		136,057,000
Provision for loss on contracts		$ 4,200,000		5,300,000
Cumulative impact to retained earnings			$ (264,000)		$ 8,665,000
Minimum
Significant Accounting Policies [Line Items]
Estimated useful life of intangible assets (in years)		10 years
Maximum
Significant Accounting Policies [Line Items]
Estimated useful life of intangible assets (in years)		18 years
Certified Thermoplastics Co., LLC
Significant Accounting Policies [Line Items]
Goodwill	$ 18,600,000
Estimated useful life of intangible assets (in years)	10 years
Electronic Systems
Significant Accounting Policies [Line Items]
Goodwill		$ 117,435,000		117,435,000
Percentage of fair value in excess of carrying amount		44.00%
Structural Systems
Significant Accounting Policies [Line Items]
Goodwill		$ 53,482,000		$ 18,622,000
Percentage of fair value in excess of carrying amount		85.00%
Other Assets
Significant Accounting Policies [Line Items]
Interest rate cap hedge premium		$ 0

Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]
Interest paid	$ 16,474	$ 11,573	$ 7,307
Taxes paid	5,699	316	3,125
Non-cash activities:
Purchases of property and equipment not paid	$ 1,380	$ 824	$ 2,104

Summary of Significant Accounting Policies - Contact Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Contract assets	$ 106,670	$ 86,665
Contract liabilities	$ 14,517	$ 17,145

Summary of Significant Accounting Policies - Remaining Performance Obligation (Details) $ in Millions	Dec. 31, 2019 USD ($)
Accounting Policies [Abstract]
Remaining performance obligation, amount	$ 745.3
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, percentage	65.00%
Remaining performance obligation, period	12 months

Summary of Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Change in revenue for the period									$ 91,781
Revenues	$ 186,926	$ 181,101	$ 180,495	$ 172,566	$ 164,183	$ 159,842	$ 154,827	$ 150,455	$ 721,088	$ 629,307	$ 558,183
Percentage of revenues									100.00%	100.00%
Electronic Systems
Disaggregation of Revenue [Line Items]
Change in revenue for the period									$ 22,505
Revenues									$ 360,373	$ 337,868
Percentage of revenues									100.00%	100.00%
Structural Systems
Disaggregation of Revenue [Line Items]
Change in revenue for the period									$ 69,276
Revenues									$ 360,715	$ 291,439
Percentage of revenues									100.00%	100.00%
Military and space
Disaggregation of Revenue [Line Items]
Change in revenue for the period									$ 46,208
Revenues									$ 323,800	$ 277,592
Percentage of revenues									44.90%	44.10%
Military and space \| Electronic Systems
Disaggregation of Revenue [Line Items]
Change in revenue for the period									$ 28,526
Revenues									$ 244,245	$ 215,719
Percentage of revenues									67.80%	63.80%
Military and space \| Structural Systems
Disaggregation of Revenue [Line Items]
Change in revenue for the period									$ 17,682
Revenues									$ 79,555	$ 61,873
Percentage of revenues									22.10%	21.20%
Commercial aerospace
Disaggregation of Revenue [Line Items]
Change in revenue for the period									$ 44,981
Revenues									$ 348,503	$ 303,522
Percentage of revenues									48.30%	48.20%
Commercial aerospace \| Electronic Systems
Disaggregation of Revenue [Line Items]
Change in revenue for the period									$ (6,613)
Revenues									$ 67,343	$ 73,956
Percentage of revenues									18.70%	21.90%
Commercial aerospace \| Structural Systems
Disaggregation of Revenue [Line Items]
Change in revenue for the period									$ 51,594
Revenues									$ 281,160	$ 229,566
Percentage of revenues									77.90%	78.80%
Industrial
Disaggregation of Revenue [Line Items]
Change in revenue for the period									$ 592
Revenues									$ 48,785	$ 48,193
Percentage of revenues									6.80%	7.70%
Industrial \| Electronic Systems
Disaggregation of Revenue [Line Items]
Change in revenue for the period									$ 592
Revenues									$ 48,785	$ 48,193
Percentage of revenues									13.50%	14.30%

Summary of Significant Accounting Policies - Weighted Average Number of Shares Outstanding Used to Compute Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Net Income	$ 8,871	$ 8,303	$ 7,815	$ 7,472	$ 673	$ 4,171	$ 1,591	$ 2,600	$ 32,461	$ 9,035	$ 20,077
Weighted-average number of common shares outstanding
Basic weighted-average common shares outstanding (in shares)									11,518	11,390	11,290
Dilutive potential common shares (in shares)									274	269	268
Diluted weighted-average common shares outstanding (in shares)									11,792	11,659	11,558
Earnings Per Share
Basic earnings (loss) per share (in dollars per share)	$ 0.77	$ 0.72	$ 0.68	$ 0.65	$ 0.06	$ 0.37	$ 0.14	$ 0.23	$ 2.82	$ 0.79	$ 1.78
Diluted earnings (loss) per share (in dollars per share)	$ 0.75	$ 0.70	$ 0.66	$ 0.64	$ 0.06	$ 0.36	$ 0.14	$ 0.22	$ 2.75	$ 0.77	$ 1.74

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Adoption of Accounting Standards Codification 842 - Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Assets
Other current assets	$ 5,497	$ 6,323	$ 6,531
Operating lease right-of-use assets	19,105	18,985	0
Non-current deferred income taxes	55	313	308
Other assets	6,006	5,409	5,155
Liabilities
Operating lease liabilities	2,956	2,544	0
Accrued and other liabilities	37,620	37,457	37,786
Non-current operating lease liabilities	17,565	18,117	0
Non-current deferred income taxes	16,766	17,994	18,070
Other long-term liabilities	17,721	13,485	14,441
Shareholders’ Equity
Retained earnings	$ 212,553	180,092	$ 180,356
Accounting Standards Update 2016-02
Assets
Other current assets		(208)
Operating lease right-of-use assets		18,985
Non-current deferred income taxes		5
Other assets		254
Liabilities
Operating lease liabilities		2,544
Accrued and other liabilities		(329)
Non-current operating lease liabilities		18,117
Non-current deferred income taxes		(76)
Other long-term liabilities		(956)
Shareholders’ Equity
Retained earnings		$ (264)

Adoption of Accounting Standards Codification 842 - Narrative (Details)	12 Months Ended
	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Lease renewal term	5 years
Lease termination period	1 year
Payments due with option to extend	$ 11,400,000
Operating lease, lease not yet commenced, amount	0
Finance lease, lease not yet commenced, amount	$ 1,300,000
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Finance lease, lease not yet commenced, term of contract	7 years
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	11 years
Finance lease, lease not yet commenced, term of contract	10 years

Adoption of Accounting Standards Codification 842 - Lease Costs (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases [Abstract]
Operating leases expense	$ 3,963
Finance leases expense:
Amortization of right-of-use assets	216
Interest on lease liabilities	42
Total finance lease expense	$ 258

Adoption of Accounting Standards Codification 842 - Supplemental Cash Flow (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases [Abstract]
Operating cash flows from operating leases	$ 4,030
Operating cash flows from finance leases	39
Financing cash flows from finance leases	169
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	2,574
Finance leases	$ 483

Adoption of Accounting Standards Codification 842 - Weighted Average Remaining Lease Term and Discount Rate (Details)	Dec. 31, 2019
Weighted Average Lease Term
Operating leases	7 years
Finance leases	4 years
Weighted Average Discount Rate
Operating leases	6.50%
Finance leases	6.50%

Adoption of Accounting Standards Codification 842 - Undiscounted Cash Flows (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Operating Leases
2020	$ 4,178
2021	4,147
2022	3,756
2023	3,425
2024	3,003
Thereafter	7,022
Total lease payments	25,531
Less imputed interest	5,010
Total	20,521
Finance Leases
2020	242
2021	229
2022	92
2023	53
2024	26
Thereafter	46
Total lease payments	688
Less imputed interest	74
Total	$ 614

Adoption of Accounting Standards Codification 842 - Prior Year Future Minimum Lease Payments (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Leases [Abstract]
2020	$ 3,680
2021	3,405
2022	2,789
2023	1,404
2024	980
Thereafter	580
Total	$ 12,838

Business Combinations - Nobles Worldwide, Inc. (Details) - USD ($) $ in Thousands		12 Months Ended
	Oct. 08, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Purchase price, net of cash acquired		$ 0	$ 0	$ 59,798
Goodwill		$ 170,917	$ 136,057
Nobles Worldwide, Inc.
Business Acquisition [Line Items]
Equity interest acquired	100.00%	100.00%
Purchase price, net of cash acquired	$ 77,000
Payments to acquire business	77,300
Gross purchase price	77,305
Intangible assets	37,700
Goodwill, expected tax deductible amount		$ 6,700
Acquisition related costs		$ 800
Goodwill	$ 34,860

Business Combinations - Fair Value of Assets and Liabilities Acquired (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Oct. 08, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Goodwill	$ 170,917		$ 136,057
Nobles Worldwide, Inc.
Business Acquisition [Line Items]
Cash		$ 658
Accounts receivable		1,880
Inventories		2,866
Other current assets		168
Property and equipment		2,319
Intangible assets		37,700
Goodwill		34,860
Other non-current assets		675
Total assets acquired		81,126
Current liabilities		(2,285)
Net non-current deferred tax liability		(861)
Other non-current liabilities		(675)
Total liabilities assumed		3,821
Total purchase price allocation		$ 77,305

Business Combinations - Estimated Fair Value of Intangible Assets Acquired (Details) - USD ($) $ in Thousands		12 Months Ended
	Oct. 08, 2019	Dec. 31, 2019
Nobles Worldwide, Inc.
Business Acquisition [Line Items]
Intangible assets	$ 37,700
Customer relationships
Business Acquisition [Line Items]
Useful Life (In years)		17 years
Customer relationships \| Nobles Worldwide, Inc.
Business Acquisition [Line Items]
Intangible assets	$ 34,700
Trade names and trademarks
Business Acquisition [Line Items]
Useful Life (In years)		14 years
Trade names and trademarks \| Nobles Worldwide, Inc.
Business Acquisition [Line Items]
Useful Life (In years)	15 years
Intangible assets	$ 3,000
Minimum
Business Acquisition [Line Items]
Useful Life (In years)		10 years
Minimum \| Customer relationships \| Nobles Worldwide, Inc.
Business Acquisition [Line Items]
Useful Life (In years)	15 years
Maximum
Business Acquisition [Line Items]
Useful Life (In years)		18 years
Maximum \| Customer relationships \| Nobles Worldwide, Inc.
Business Acquisition [Line Items]
Useful Life (In years)	16 years

Business Combinations - Certified Thermoplastics Co., LLC (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Apr. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018
Business Acquisition [Line Items]
Purchase price, net of cash acquired		$ 0	$ 0	$ 59,798
Goodwill		$ 170,917	$ 136,057
Certified Thermoplastics Co., LLC
Business Acquisition [Line Items]
Equity interest acquired	100.00%				100.00%
Purchase price, net of cash acquired	$ 30,700
Payments to acquire business	30,800
Gross purchase price	30,800
Intangible assets	8,100
Inventories	2,200
Accounts receivable	1,500
Property and equipment	600
Cash	100
Other current assets	100
Total liabilities assumed	400
Goodwill	$ 18,600
Estimated useful life of intangible assets (in years)	10 years
Customer relationships
Business Acquisition [Line Items]
Estimated useful life of intangible assets (in years)		17 years
Customer relationships \| Certified Thermoplastics Co., LLC
Business Acquisition [Line Items]
Intangible assets	$ 6,900
Trade Names \| Certified Thermoplastics Co., LLC
Business Acquisition [Line Items]
Intangible assets	$ 1,200

Restructuring Activities - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 3,800	$ 3,400	$ 5,400	$ 2,200	$ 0	$ 14,671	$ 8,360
Restructuring Plan, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date					23,600
Restructuring charges					0	$ 14,800	$ 8,800
Non-cash payments					735
Restructuring Plan, 2017 \| Severance and benefits
Restructuring Cost and Reserve [Line Items]
Restructuring charges					0
Non-cash payments					0
Restructuring Plan, 2017 \| Lease termination
Restructuring Cost and Reserve [Line Items]
Restructuring charges					0
Non-cash payments					735
Restructuring Plan, 2017 \| Other
Restructuring Cost and Reserve [Line Items]
Restructuring charges					0
Non-cash payments					0
Restructuring Plan, 2017 \| Professional service fees
Restructuring Cost and Reserve [Line Items]
Restructuring charges					0
Non-cash payments					0
Restructuring Plan, 2017 \| Electronic Systems
Restructuring Cost and Reserve [Line Items]
Inventory write-down					100
Restructuring Plan, 2017 \| Electronic Systems \| Severance and benefits
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date					3,800
Restructuring Plan, 2017 \| Electronic Systems \| Lease termination
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date					900
Restructuring Plan, 2017 \| Electronic Systems \| Other
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date					900
Restructuring Plan, 2017 \| Electronic Systems \| Professional service fees
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date					200
Restructuring Plan, 2017 \| Electronic Systems \| Property and equipment impairment due to restructuring
Restructuring Cost and Reserve [Line Items]
Non-cash payments					100
Restructuring Plan, 2017 \| Structural Systems
Restructuring Cost and Reserve [Line Items]
Inventory write-down					500
Restructuring Plan, 2017 \| Structural Systems \| Severance and benefits
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date					3,000
Restructuring Plan, 2017 \| Structural Systems \| Other
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date					400
Restructuring Plan, 2017 \| Structural Systems \| Property and equipment impairment due to restructuring
Restructuring Cost and Reserve [Line Items]
Non-cash payments					9,800
Corporate Segment \| Restructuring Plan, 2017 \| Severance and benefits
Restructuring Cost and Reserve [Line Items]
Accrued severance and loss on early exit					1,400
Corporate Segment \| Restructuring Plan, 2017 \| Professional service fees
Restructuring Cost and Reserve [Line Items]
Accrued severance and loss on early exit					1,000
Corporate Segment \| Restructuring Plan, 2017 \| Modification of stock-based compensation awards
Restructuring Cost and Reserve [Line Items]
Accrued severance and loss on early exit					$ 1,400

Restructuring Activities - (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Reserve [Roll Forward]
Charges	$ 3,800	$ 3,400	$ 5,400	$ 2,200	$ 0	$ 14,671	$ 8,360
Restructuring Plan, 2017
Restructuring Reserve [Roll Forward]
Beginning balance					4,001
Charges					0	14,800	$ 8,800
Cash Payments					(3,216)
Adoption of ASC 842 Adjustment					(735)
Change in Estimates					(50)
Ending balance	4,001				0	4,001
Restructuring Plan, 2017 \| Restructuring Charges
Restructuring Reserve [Roll Forward]
Beginning balance					3,951
Charges					0
Cash Payments					(3,216)
Adoption of ASC 842 Adjustment					(735)
Change in Estimates					0
Ending balance	3,951				0	3,951
Restructuring Plan, 2017 \| Cost of Sales
Restructuring Reserve [Roll Forward]
Beginning balance					50
Charges					0
Cash Payments					0
Adoption of ASC 842 Adjustment					0
Change in Estimates					(50)
Ending balance	50				0	50
Severance and benefits \| Restructuring Plan, 2017
Restructuring Reserve [Roll Forward]
Beginning balance					2,631
Charges					0
Cash Payments					(2,631)
Adoption of ASC 842 Adjustment					0
Change in Estimates					0
Ending balance	2,631				0	2,631
Lease termination \| Restructuring Plan, 2017
Restructuring Reserve [Roll Forward]
Beginning balance					861
Charges					0
Cash Payments					(126)
Adoption of ASC 842 Adjustment					(735)
Change in Estimates					0
Ending balance	861				0	861
Professional service fees \| Restructuring Plan, 2017
Restructuring Reserve [Roll Forward]
Beginning balance					43
Charges					0
Cash Payments					(43)
Adoption of ASC 842 Adjustment					0
Change in Estimates					0
Ending balance	43				0	43
Other \| Restructuring Plan, 2017
Restructuring Reserve [Roll Forward]
Beginning balance					416
Charges					0
Cash Payments					(416)
Adoption of ASC 842 Adjustment					0
Change in Estimates					0
Ending balance	416				0	416
Inventory reserve \| Restructuring Plan, 2017
Restructuring Reserve [Roll Forward]
Beginning balance					50
Charges					0
Cash Payments					0
Adoption of ASC 842 Adjustment					0
Change in Estimates					(50)
Ending balance	$ 50				$ 0	$ 50

Inventories - (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 98,151	$ 89,767
Work in process	10,887	9,199
Finished goods	3,444	2,159
Total	$ 112,482	$ 101,125

Property and Equipment, Net - (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 278,136	$ 261,885
Less accumulated depreciation	162,920	154,840
Total	115,216	107,045
Depreciation expense	13,500	13,500	$ 13,200
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	15,765	15,662
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 61,626	57,642
Buildings and improvements \| Minimum
Property, Plant and Equipment [Line Items]
Useful life	5 years
Buildings and improvements \| Maximum
Property, Plant and Equipment [Line Items]
Useful life	40 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 167,688	160,163
Machinery and equipment \| Minimum
Property, Plant and Equipment [Line Items]
Useful life	2 years
Machinery and equipment \| Maximum
Property, Plant and Equipment [Line Items]
Useful life	20 years
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 18,714	19,676
Furniture and equipment \| Minimum
Property, Plant and Equipment [Line Items]
Useful life	2 years
Furniture and equipment \| Maximum
Property, Plant and Equipment [Line Items]
Useful life	10 years
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 14,343	$ 8,742

Goodwill and Other Intangible Assets - Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Goodwill [Line Items]
Gross goodwill		$ 217,779
Accumulated goodwill impairment		(81,722)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 136,057
Goodwill from acquisition during the period	34,860
Goodwill, ending balance	170,917
Electronic Systems
Goodwill [Line Items]
Gross goodwill		199,157
Accumulated goodwill impairment		(81,722)
Goodwill [Roll Forward]
Goodwill, beginning balance	117,435
Goodwill from acquisition during the period	0
Goodwill, ending balance	117,435
Structural Systems
Goodwill [Line Items]
Gross goodwill		18,622
Accumulated goodwill impairment		$ 0
Goodwill [Roll Forward]
Goodwill, beginning balance	18,622
Goodwill from acquisition during the period	34,860
Goodwill, ending balance	$ 53,482

Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Oct. 08, 2019	Apr. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018
Goodwill And Intangible Assets [Line Items]
Goodwill			$ 170,917	$ 136,057
Purchase price, net of cash acquired			0	0	$ 59,798
Amortization expense of intangible asset			$ 11,400	10,700	$ 9,300
Minimum
Goodwill And Intangible Assets [Line Items]
Acquired intangible assets amortization period			10 years
Maximum
Goodwill And Intangible Assets [Line Items]
Acquired intangible assets amortization period			18 years
Certified Thermoplastics Co., LLC
Goodwill And Intangible Assets [Line Items]
Goodwill		$ 18,600
Equity interest acquired		100.00%				100.00%
Purchase price, net of cash acquired		$ 30,700
Gross purchase price		$ 30,800
Nobles Worldwide, Inc.
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 34,860
Equity interest acquired	100.00%		100.00%
Purchase price, net of cash acquired	$ 77,000
Gross purchase price	$ 77,305
Structural Systems
Goodwill And Intangible Assets [Line Items]
Goodwill			$ 53,482	$ 18,622
Percentage of fair value in excess of carrying amount			85.00%

Goodwill and Other Intangible Assets - Carrying Amount of Finite-lived and Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 229,645	$ 191,945
Accumulated Amortization	91,283	79,853
Net Carrying Amount	138,362	112,092
Electronic Systems
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	164,545	164,545
Accumulated Amortization	71,527	62,108
Net Carrying Amount	93,018	102,437
Structural Systems
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	65,100	27,400
Accumulated Amortization	19,756	17,745
Net Carrying Amount	$ 45,344	9,655
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets (in years)	17 years
Gross Carrying Amount	$ 221,900	187,200
Accumulated Amortization	88,838	77,824
Net Carrying Amount	$ 133,062	109,376
Trade names and trademarks
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets (in years)	14 years
Gross Carrying Amount	$ 5,500	2,500
Accumulated Amortization	450	193
Net Carrying Amount	$ 5,050	2,307
Contract renewal
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets (in years)	14 years
Gross Carrying Amount	$ 1,845	1,845
Accumulated Amortization	1,757	1,625
Net Carrying Amount	$ 88	220
Technology
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets (in years)	15 years
Gross Carrying Amount	$ 400	400
Accumulated Amortization	238	211
Net Carrying Amount	$ 162	$ 189

Goodwill and Other Intangible Assets - Future Amortization Expense of Other Intangible Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2020	$ 13,067
2021	12,901
2022	12,841
2023	12,782
2024	12,548
Thereafter	74,223
Net Carrying Amount	138,362	$ 112,092
Electronic Systems
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2020	9,348
2021	9,287
2022	9,288
2023	9,287
2024	9,288
Thereafter	46,520
Net Carrying Amount	93,018	102,437
Structural Systems
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2020	3,719
2021	3,614
2022	3,553
2023	3,495
2024	3,260
Thereafter	27,703
Net Carrying Amount	$ 45,344	$ 9,655

Accrued Liabilities - (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Accrued compensation	$ 31,342		$ 29,616
Accrued income tax and sales tax	163		82
Other	6,115		8,088
Total	$ 37,620	$ 37,457	$ 37,786

Long-Term Debt - Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt, gross	$ 310,000	$ 233,000
Less current portion	7,000	2,330
Total long-term debt, less current portion	303,000	230,670
Less debt issuance costs	2,113	1,802
Total long-term debt, net of debt issuance costs	$ 300,887	$ 228,868
Weighted-average interest rate (percent)	6.87%	4.71%
Term loans
Debt Instrument [Line Items]
Long-term debt, gross	$ 310,000	$ 233,000
Revolving credit facility
Debt Instrument [Line Items]
Long-term debt, gross	0	0
Less debt issuance costs	$ 1,894	$ 1,907

Long-Term Debt - Future Long-Term Debt Payment (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]
2020	$ 7,000
2021	7,000
2022	7,000
2023	7,000
2024	112,000
Thereafter	170,000
Total Debt	$ 310,000

Long-Term Debt - Narrative (Details) - USD ($)			1 Months Ended					12 Months Ended
Long-Term Debt - Narrative (Details) - USD ($)	Dec. 20, 2019	Oct. 08, 2019	Nov. 30, 2018	Apr. 30, 2018	Oct. 31, 2017	Sep. 30, 2017	Oct. 31, 2015	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018
Debt Instrument [Line Items]
Repayments of debt								$ 169,000	$ 0	$ 3,000
Loss on extinguishment of debt								180,000	926,000	0
Purchase price, net of cash acquired								$ 0	0	59,798,000
Parsons, KS
Debt Instrument [Line Items]
Proceeds received from sale of property to be leased back									2,200,000	14,200,000
Total lease liability from assets sold									2,200,000	14,200,000
Parsons, KS \| Municipal Bonds
Debt Instrument [Line Items]
Purchase of industrial revenue bonds									2,200,000	$ 14,200,000
Interest rate cap premiums
Debt Instrument [Line Items]
Hedging asset							$ 135,000,000
Payments for hedging asset							$ 1,000,000
2018 Revolving Credit Facility
Debt Instrument [Line Items]
Debt issuance costs, net			$ 1,800,000
Accumulated amortization of debt			200,000
Debt issuance costs			$ 2,000,000
Term of debt instrument			5 years
2018 Term Loan
Debt Instrument [Line Items]
Debt issuance costs, net			$ 1,700,000
Accumulated amortization of debt			100,000
Debt issuance costs			$ 1,800,000
Term of debt instrument			7 years
Credit Facilities
Debt Instrument [Line Items]
Face amount of instrument	$ 480,000,000.0
New Existing Revolving Credit Facility
Debt Instrument [Line Items]
Amortization of debt issuance costs			$ 500,000
Loss on extinguishment of debt			900,000
Existing Term Loan
Debt Instrument [Line Items]
Amortization of debt issuance costs			400,000
New Credit Facilities
Debt Instrument [Line Items]
Debt issuance costs, net			$ 3,500,000
Nobles Worldwide, Inc.
Debt Instrument [Line Items]
Equity interest acquired		100.00%						100.00%
Purchase price, net of cash acquired		$ 77,000,000
Payments to acquire business		$ 77,300,000
Certified Thermoplastics Co., LLC
Debt Instrument [Line Items]
Equity interest acquired				100.00%							100.00%
Purchase price, net of cash acquired				$ 30,700,000
Payments to acquire business				$ 30,800,000
Lightning Diversion Systems, Inc.
Debt Instrument [Line Items]
Equity interest acquired						100.00%
Purchase price, net of cash acquired						$ 60,000,000
Payments to acquire business					$ 600,000	$ 61,400,000
Revolving Credit Facility \| Minimum
Debt Instrument [Line Items]
Commitment fee (percent)			0.20%
Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Commitment fee (percent)			0.30%
Revolving Credit Facility \| New Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 100,000,000.0
Revolving Credit Facility \| New Revolving Credit Facility \| Minimum
Debt Instrument [Line Items]
Commitment fee (percent)	0.175%
Revolving Credit Facility \| New Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Commitment fee (percent)	0.275%
Revolving Credit Facility \| New Revolving Credit Facility \| LIBOR Rate \| Minimum
Debt Instrument [Line Items]
Variable rate spread (percent)	1.50%
Revolving Credit Facility \| New Revolving Credit Facility \| LIBOR Rate \| Maximum
Debt Instrument [Line Items]
Variable rate spread (percent)	2.50%
Revolving Credit Facility \| New Revolving Credit Facility \| Federal Funds Rate
Debt Instrument [Line Items]
Fixed rate spread (percent)	0.50%
Revolving Credit Facility \| New Revolving Credit Facility \| Eurodollar Rate
Debt Instrument [Line Items]
Fixed rate spread (percent)	1.00%
Revolving Credit Facility \| New Revolving Credit Facility \| Base Rate \| Minimum
Debt Instrument [Line Items]
Variable rate spread (percent)	0.50%
Revolving Credit Facility \| New Revolving Credit Facility \| Base Rate \| Maximum
Debt Instrument [Line Items]
Variable rate spread (percent)	1.50%
Revolving Credit Facility \| 2018 Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity									$ 100,000,000.0
Percentage of excess cash flow payment when leverage ratio is greater than 3.25			50.00%
Percentage of excess cash flow payment when leverage ratio is less than or equal to 3.25			25.00%
Percentage of excess cash flow payment when leverage ratio is less than or equal to 2.50			0.00%
Proceeds from lines of credit			$ 7,900,000
Repayments of lines of credit	$ 58,500,000
Fees paid to lenders to be capitalized								$ 500,000
Amortization of debt issuance costs								500,000
Debt issuance costs, net								1,100,000
Revolving Credit Facility \| 2018 Revolving Credit Facility \| LIBOR Rate \| Minimum
Debt Instrument [Line Items]
Variable rate spread (percent)			1.75%
Revolving Credit Facility \| 2018 Revolving Credit Facility \| LIBOR Rate \| Maximum
Debt Instrument [Line Items]
Variable rate spread (percent)			2.75%
Revolving Credit Facility \| 2018 Revolving Credit Facility \| Federal Funds Rate
Debt Instrument [Line Items]
Fixed rate spread (percent)			0.50%
Revolving Credit Facility \| 2018 Revolving Credit Facility \| Eurodollar Rate
Debt Instrument [Line Items]
Fixed rate spread (percent)			1.00%
Revolving Credit Facility \| 2018 Revolving Credit Facility \| Base Rate \| Minimum
Debt Instrument [Line Items]
Variable rate spread (percent)			0.75%
Revolving Credit Facility \| 2018 Revolving Credit Facility \| Base Rate \| Maximum
Debt Instrument [Line Items]
Variable rate spread (percent)			1.75%
Revolving Credit Facility \| 2018 Term Loan
Debt Instrument [Line Items]
Fees paid to lenders to be capitalized								1,500,000
Revolving Credit Facility \| New Existing Revolving Credit Facility
Debt Instrument [Line Items]
Repayments of lines of credit			$ 247,900,000
Revolving Credit Facility \| New Credit Facilities
Debt Instrument [Line Items]
Remaining borrowing capacity								99,800,000
Outstanding standby letters of credit								200,000
Secured Debt \| New Term Loan
Debt Instrument [Line Items]
Face amount of instrument	$ 140,000,000.0
Prepayment percentage of principal	1.25%
Proceeds from lines of credit	$ 140,000,000
Fees paid to lenders to be capitalized								$ 600,000
Secured Debt \| New Term Loan \| LIBOR Rate \| Minimum
Debt Instrument [Line Items]
Variable rate spread (percent)	1.50%
Secured Debt \| New Term Loan \| LIBOR Rate \| Maximum
Debt Instrument [Line Items]
Variable rate spread (percent)	2.50%
Secured Debt \| New Term Loan \| Federal Funds Rate
Debt Instrument [Line Items]
Fixed rate spread (percent)	0.50%
Secured Debt \| New Term Loan \| Eurodollar Rate
Debt Instrument [Line Items]
Fixed rate spread (percent)	1.00%
Secured Debt \| New Term Loan \| Base Rate \| Minimum
Debt Instrument [Line Items]
Variable rate spread (percent)	0.50%
Secured Debt \| New Term Loan \| Base Rate \| Maximum
Debt Instrument [Line Items]
Variable rate spread (percent)	1.50%
Secured Debt \| 2018 Term Loan
Debt Instrument [Line Items]
Face amount of instrument			$ 240,000,000.0
Prepayment percentage of principal			0.25%
Proceeds from lines of credit			$ 240,000,000
Repayments of debt	$ 56,000,000
Secured Debt \| 2018 Term Loan \| LIBOR Rate \| Minimum
Debt Instrument [Line Items]
Variable rate spread (percent)			3.75%
Secured Debt \| 2018 Term Loan \| LIBOR Rate \| Maximum
Debt Instrument [Line Items]
Variable rate spread (percent)			4.00%
Secured Debt \| 2018 Term Loan \| Federal Funds Rate
Debt Instrument [Line Items]
Fixed rate spread (percent)			0.50%
Secured Debt \| 2018 Term Loan \| Eurodollar Rate
Debt Instrument [Line Items]
Fixed rate spread (percent)			1.00%
Secured Debt \| 2018 Term Loan \| Base Rate \| Minimum
Debt Instrument [Line Items]
Variable rate spread (percent)			3.75%
Secured Debt \| 2018 Term Loan \| Base Rate \| Maximum
Debt Instrument [Line Items]
Variable rate spread (percent)			4.00%

Shareholders' Equity - Narrative (Details) - shares	Dec. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0

Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) plan $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of incentive plans \| plan	2
Granted (in shares) \| shares	189,170
Grants (in dollars per share) \| $ / shares	$ 15.95
Weighted average remaining contractual term	7 years 8 months 18 days
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares) \| shares	750,000
Shares reserved for future issuance (in shares) \| shares	723,479
Discount from market price, offering date	15.00%
Maximum percentage of employee compensation for purchase of common stock	10.00%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares) \| shares	189,170	176,940	129,400
Grants (in dollars per share) \| $ / shares	$ 15.95	$ 12.87	$ 11.88
Expiration period from date of grant	10 years
Aggregate intrinsic value of stock options exercised	$ 1.8	$ 1.3	$ 2.5
Cash received from the exercise of options	2.6	1.8	4.3
Tax benefits realized for the tax deductions from options exercised	$ 0.6	0.3	0.9
Options vested (in shares) \| shares	446,818
Weighted average exercise price (in dollars per share) \| $ / shares	$ 34.68
Aggregate intrinsic value	$ 7.3
Weighted average remaining contractual term	7 years 8 months 18 days
Share-based compensation expense	$ 1.6	0.9	0.7
Unrecognized compensation cost related to stock option	$ 3.7
Weighted average period	1 year 11 months 14 days
Total fair value of options expensed before tax benefits	$ 1.3	0.8	0.8
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vesting term	3 years
Share-based compensation expense	$ 2.4	$ 2.1	$ 2.0
Weighted average period	1 year 4 months 24 days
Granted (in shares) \| shares	62,520	81,230	135,350
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 41.04	$ 32.36	$ 28.97
Compensation not yet recognized	$ 2.9
Fair value of awards vested in period	2.4	$ 2.7	$ 3.0
Tax benefit realized on vesting of options	0.6	0.6	1.1
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 3.2	$ 1.9	$ 2.0
Weighted average period	2 years 3 months 18 days
Granted (in shares) \| shares	58,178	64,700	126,000
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 43.80	$ 35.16	$ 26.31
Compensation not yet recognized	$ 3.2
Fair value of awards vested in period	3.8	$ 0.3	$ 1.2
Tax benefit realized on vesting of options	$ 0.9	$ 0.1	$ 0.5
2013 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares) \| shares	1,690,000
Shares reserved for future issuance other than stock options (in shares) \| shares	337,693
Shares reserved for future issuance (in shares) \| shares	222,132
Minimum \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vesting term	3 years
Maximum \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vesting term	4 years
Third Anniversary \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.00%
Second Anniversary \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	33.00%
First Anniversary \| Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	34.00%

Stock-Based Compensation - Option Activity (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Number of Shares
Beginning Balance (in shares) \| shares	363,225
Granted (in shares) \| shares	189,170
Exercised (in shares) \| shares	(80,693)
Expired (in shares) \| shares	(2,857)
Forfeited (in shares) \| shares	(22,027)
Ending Balance (in shares) \| shares	446,818
Exercisable at end of period (in shares) \| shares	96,947
Weighted-Average Exercise Price Per Share
Beginning Balance (in dollars per share) \| $ / shares	$ 28.33
Granted (in dollars per share) \| $ / shares	41.97
Exercised (in dollars per share) \| $ / shares	24.97
Expired (in dollars per share) \| $ / shares	20.09
Forfeited (in dollars per share) \| $ / shares	29.99
Ending Balance (in dollars per share) \| $ / shares	34.68
Exercisable at end of period (in dollars per share) \| $ / shares	$ 27.70
Weighted-Average Remaining Contractual Life (Years)
Outstanding	7 years 8 months 18 days
Exerciseable	5 years 3 months 18 days
Aggregate Intrinsic Value (in thousands)
Outstanding \| $	$ 7,319
Exerciseable \| $	$ 2,265

Stock-Based Compensation - Changes in Nonvested Stock Options (Details)	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Number of Stock Options
Beginning balance (in shares) \| shares	292,013
Granted (in shares) \| shares	189,170
Vested (shares) \| shares	(109,285)
Forfeited (shares) \| shares	(22,027)
Ending balance (in shares) \| shares	349,871
Weighted- Average Grant Date Fair Value
Beginning balance, (in dollars per share) \| $ / shares	$ 12.20
Granted, (in dollars per share) \| $ / shares	15.95
Vested, (in dollars per share) \| $ / shares	11.95
Forfeited, (in dollars per share) \| $ / shares	10.24
Ending balance, (in dollars per share) \| $ / shares	$ 14.33

Stock-Based Compensation - Assumptions Used for Estimating Fair Value of Share Based Payment Award (Details) - Stock Options - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate (percent)	1.92%	2.65%	1.75%
Expected volatility (percent)	40.44%	53.66%	50.37%
Expected dividends	$ 0	$ 0	$ 0
Expected term (in months)	60 months	36 months	48 months

Stock-Based Compensation - Restricted Stock Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted Stock Units
Outstanding
Beginning of period (in shares)	157,937
Granted (in shares)	62,520	81,230	135,350
Vested (in shares)	(85,279)
Forfeited (in shares)	(7,755)
Ending of period (in shares)	127,423	157,937
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share)	$ 28.96
Granted (in dollars per share)	41.04	$ 32.36	$ 28.97
Vested (in dollars per share)	27.94
Forfeited (in dollars per share)	30.80
Outstanding at ending of period (in dollars per share)	$ 36.22	$ 28.96
Performance Stock Units
Outstanding
Beginning of period (in shares)	236,700
Granted (in shares)	58,178	64,700	126,000
Vested (in shares)	(85,504)
Forfeited (in shares)	(11,800)
Ending of period (in shares)	197,574	236,700
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share)	$ 26.21
Granted (in dollars per share)	43.80	$ 35.16	$ 26.31
Vested (in dollars per share)	19.05
Forfeited (in dollars per share)	33.21
Outstanding at ending of period (in dollars per share)	$ 33.98	$ 26.21

Employee Benefit Plans - Narrative (Details)	12 Months Ended
Employee Benefit Plans - Narrative (Details)	Dec. 31, 2019 USD ($) CompensationPlan	Dec. 31, 2018 USD ($) CompensationPlan	Dec. 31, 2017 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of unfunded supplemental retirement plans \| CompensationPlan	3
Accumulated benefit obligations	$ 400,000	$ 600,000
Number of company sponsored 401(K) defined contribution plans \| CompensationPlan	1
Provision for matching and profit sharing contribution	$ 2,700,000	2,600,000	$ 2,700,000
Estimated net actuarial loss for the defined benefit pension plan	900,000
Excess of accumulated benefit obligation over fair value of plan assets	10,600,000
Pension liability	8,100,000	$ 7,200,000
Estimated employer Contribution to pension plan in next fiscal year	$ 900,000
Plan One covering all employees, other than employees of Miltec
Defined Benefit Plan Disclosure [Line Items]
Contribution by employee towards defined benefit plan	25.00%
Contribution by employer towards defined benefit plan	50.00%
Employee contribution compensation limit	6.00%
Executives and Directors
Defined Benefit Plan Disclosure [Line Items]
Number of unfunded supplemental retirement plans \| CompensationPlan	2	2
Deferred Compensation Plan
Defined Benefit Plan Disclosure [Line Items]
Liability for labarge deferred compensation plan	$ 0	$ 700,000
Interest on labarge deferred compensation plan	$ 100,000	$ 100,000

Employee Benefit Plans - Components of Net Periodic Pension Cost for Defined Benefit Pension Plan and Retirement Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
Service cost	$ 503	$ 601	$ 531
Interest cost	1,388	1,268	1,329
Expected return on plan assets	(1,644)	(1,784)	(1,530)
Amortization of actuarial losses	885	743	810
Net periodic pension cost	$ 1,132	$ 828	$ 1,140

Employee Benefit Plans - Reclassifications from Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
Amortization of actuarial loss - total before tax	$ 885
Tax benefit	(209)	$ (173)	$ (302)
Net of tax	$ 676	$ 570	$ 508

Employee Benefit Plans - Obligation and Funded Status of Defined Benefit Pension Plan and Retirement Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in benefit obligation
Benefit obligation at beginning of year	$ 33,951	$ 36,002
Service cost	503	601	$ 531
Interest cost	1,388	1,268	1,329
Actuarial (gain) loss	4,769	(2,415)
Benefits paid	(1,526)	(1,505)
Ending benefit obligation	39,085	33,951	36,002
Change in plan assets
Fair value of plan assets at beginning of year	23,749	25,646
Return on assets	4,347	(1,951)
Employer contribution	1,873	1,559
Benefits paid	(1,526)	(1,505)
Fair value of plan assets at end of year	28,443	23,749	25,646
Funded status (underfunded)	(10,642)	(10,202)
Amounts recognized in the consolidated balance sheet
Current liabilities	0	580
Non-current liabilities	10,642	9,622
Unrecognized loss included in accumulated other comprehensive loss
Unrecognized loss before tax, beginning balance	9,485	8,908
Amortization	(885)	(743)
Liability (gain) loss	4,769	(2,415)
Asset loss (gain)	(2,709)	3,735
Unrecognized loss before tax, ending balance	10,660	9,485	$ 8,908
Tax impact	(2,544)	(2,263)
Unrecognized loss included in accumulated other comprehensive loss, net of tax	$ 8,116	$ 7,222

Employee Benefit Plans - Pension Plan Asset Allocations (Details)	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	100.00%	100.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	69.00%	57.00%
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	1.00%	1.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	30.00%	42.00%

Employee Benefit Plans - Asset Allocation Ranges (Details)	Dec. 31, 2019
Minimum \| Cash
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percentage	0.00%
Minimum \| Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percentage	15.00%
Minimum \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percentage	30.00%
Maximum \| Cash
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percentage	10.00%
Maximum \| Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percentage	75.00%
Maximum \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Asset allocation percentage	80.00%

Employee Benefit Plans - Return on Current and Target Asset Allocation (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	$ 28,443	$ 23,749
Total plan assets at fair value	7,676	6,126
Pooled funds	20,767	17,623
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	232	153
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	3,247	3,647
Equities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	2,645	1,475
Other Investments
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	1,552	851
Level 1
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	7,676	6,126
Level 1 \| Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	232	153
Level 1 \| Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	3,247	3,647
Level 1 \| Equities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	2,645	1,475
Level 1 \| Other Investments
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	1,552	851
Level 2
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	0	0
Level 2 \| Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Level 2 \| Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Level 2 \| Equities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Level 2 \| Other Investments
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Level 3
Defined Benefit Plan Disclosure [Line Items]
Total plan assets at fair value	0	0
Level 3 \| Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Level 3 \| Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Level 3 \| Equities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Level 3 \| Other Investments
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	$ 0	$ 0

Employee Benefit Plans - Weighted-average Assumptions Used to Determine Benefit Obligations (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension Plan
Discount rate used to determine pension expense :
Discount rate	3.22%	3.64%	4.18%
Discount rate used to determine value of obligations
Discount rate	4.23%	4.23%	3.64%
Long term rate of return	7.00%	7.00%	7.00%
Retirement Plan
Discount rate used to determine pension expense :
Discount rate	2.85%	3.40%	3.75%
Discount rate used to determine value of obligations
Discount rate	4.00%	4.00%	3.40%

Employee Benefit Plans - Future Benefit Payments Under Pension Plans (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Pension Plan
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2020	$ 1,252
2021	1,339
2022	1,452
2023	1,495
2024	1,607
2025 - 2029	9,002
Retirement Plan
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2020	589
2021	569
2022	545
2023	517
2024	486
2025 - 2029	$ 2,012

Income Taxes - Schedule of Components of Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current tax expense
Federal									$ 5,802	$ 474	$ 2,387
State									1,067	1,260	525
Current tax expense									6,869	1,734	2,912
Deferred tax (benefit) expense
Federal									(650)	(789)	(15,515)
State									(917)	291	135
Deferred tax (benefit) expense									(1,567)	(498)	(15,380)
Income tax expense (benefit)	$ 977	$ 1,937	$ 1,363	$ 1,025	$ 1,118	$ 119	$ 242	$ (243)	$ 5,302	$ 1,236	$ (12,468)

Income Taxes - Narrative (Detail) - USD ($) $ in Thousands	12 Months Ended
Income Taxes - Narrative (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Tax Credit Carryforward [Line Items]
Tax Cuts and Jobs Act of 2017, tax benefit			$ 13,000
Excess tax benefit over compensation cost recognized, amount	$ 800	$ 200	600
Operating loss carryforward not expected to be realized under ASC subtopic 740-10	16,900
Tax credit carryforwards	84	288
Tax credit carryforwards valuation allowance	9,375	9,083
Unrecognized tax benefits	5,663	$ 5,283	$ 5,271	$ 3,036
Unrecognized tax benefits that would impact effective tax rate	4,000
Decrease in unrecognized tax benefits is reasonably possible	2,000
Federal
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	22,500
Tax credit carryforwards	100
State
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	26,500
Tax credit carryforwards	12,800
Tax credit carryforwards valuation allowance	$ 10,700

Income Taxes - Schedule of Deferred Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Accrued expenses	$ 776	$ 704
Allowance for doubtful accounts	314	267
Contract overrun reserves	1,004	1,263
Deferred compensation	94	302
Employment-related accruals	5,049	4,252
Environmental reserves	494	479
Federal tax credit carryforwards	84	288
Inventory reserves	2,334	1,757
Pension obligation	2,552	2,324
Federal and state net operating loss carryforwards	6,251	51
State tax credit carryforwards	8,900	9,075
Stock-based compensation	1,672	1,661
Workers’ compensation	43	51
Other	1,409	1,538
Total gross deferred tax assets	30,976	24,012
Valuation allowance	(9,375)	(9,083)
Total gross deferred tax assets, net of valuation allowance	21,601	14,929
Deferred tax liabilities:
Deferred revenue	(256)	(649)
Depreciation	(8,852)	(7,951)
Goodwill	(4,109)	(3,963)
Intangibles	(24,749)	(19,905)
Prepaid insurance	(346)	(223)
Total gross deferred tax liabilities	(38,312)	(32,691)
Net deferred tax liabilities	$ (16,711)	$ (17,762)

Income Taxes - Variation Between Expected and Effective Tax Rate (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	21.00%	21.00%	35.00%
State income taxes (net of federal benefit)	3.60%	5.30%	2.50%
Foreign derived intangible income deduction	(0.012)	(0.000)	(0.000)
Qualified domestic production activities	(0.00%)	(0.00%)	(2.60%)
Stock-based compensation expense	(2.10%)	(1.90%)	(8.20%)
Research and development tax credits	(7.80%)	(32.00%)	(50.60%)
Other tax credits	(0.00%)	(1.20%)	(7.50%)
Changes in valuation allowance	(1.60%)	0.70%	10.60%
Non-deductible book expenses	3.90%	8.20%	1.10%
Changes in deferred tax assets	(2.20%)	12.10%	15.40%
Re-measurement of deferred taxes for 2017 Tax Act	(0.000)	(0.000)	(1.713)
Changes in tax reserves	1.20%	1.20%	11.40%
Other	(0.80%)	(1.40%)	0.40%
Effective income tax (benefit) rate	14.00%	12.00%	(163.80%)

Income Taxes - Schedule of Changes in Unrecognized Tax Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	$ 5,283	$ 5,271	$ 3,036
Additions for tax positions related to the current year	408	419	422
Additions for tax positions related to prior years	0	92	1,953
Reductions for tax positions related to prior years	(28)	(499)	(99)
Reductions for lapse of statute of limitations	0	0	(41)
Ending Balance	$ 5,663	$ 5,283	$ 5,271

- Narrative (Details) - Ducommun AeroStructures $ in Millions	Dec. 31, 2019 USD ($)
El Mirage and Monrovia, California
Loss Contingencies [Line Items]
Reserve for estimated liability	$ 1.5
Casmalia and West Covina, California
Loss Contingencies [Line Items]
Reserve for estimated liability	0.4
Casmalia and West Covina, California \| Minimum
Loss Contingencies [Line Items]
Estimate of possible loss	0.4
Casmalia and West Covina, California \| Maximum
Loss Contingencies [Line Items]
Estimate of possible loss	$ 3.1

Major Customers and Concentrations of Credit Risk - Sales to Major Customers (Details) - Customer Concentration Risk - Revenue from Contract with Customer Benchmark	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Boeing
Revenue, Major Customer [Line Items]
Concentration percentage	16.60%	17.00%	16.30%
Lockheed Martin
Revenue, Major Customer [Line Items]
Concentration percentage	4.00%	4.40%	5.50%
Raytheon
Revenue, Major Customer [Line Items]
Concentration percentage	11.00%	11.70%	13.50%
Spirit
Revenue, Major Customer [Line Items]
Concentration percentage	12.20%	9.50%	8.20%
Top Ten Customers
Revenue, Major Customer [Line Items]
Concentration percentage	63.50%	62.90%	62.50%

Major Customers and Concentrations of Credit Risk - Receivables from Customers (Details) - Customer Concentration Risk - Accounts Receivable	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Boeing
Concentration Risk [Line Items]
Concentration percentage	5.90%	8.00%
Lockheed Martin
Concentration Risk [Line Items]
Concentration percentage	0.80%	2.50%
Raytheon
Concentration Risk [Line Items]
Concentration percentage	3.30%	3.20%
Spirit
Concentration Risk [Line Items]
Concentration percentage	2.00%	0.00%

Major Customers and Concentrations of Credit Risk - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Concentration Risk [Line Items]
Revenues	$ 186,926	$ 181,101	$ 180,495	$ 172,566	$ 164,183	$ 159,842	$ 154,827	$ 150,455	$ 721,088	$ 629,307	$ 558,183
Non-Us
Concentration Risk [Line Items]
Revenues									$ 81,600	$ 71,900	$ 57,200
Maximum \| Non-Us
Concentration Risk [Line Items]
Percentage of sales									4.00%	3.00%	3.00%

Business Segment Information - Narrative (Details) $ in Thousands		1 Months Ended		12 Months Ended
	Oct. 08, 2019 USD ($)	Apr. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2019 USD ($) Segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2018
Segment Reporting [Abstract]
Number of reportable segments \| Segment				2
Segment Reporting Information [Line Items]
Purchase price, net of cash acquired				$ 0	$ 0	$ 59,798
Nobles Worldwide, Inc.
Segment Reporting Information [Line Items]
Equity interest acquired	100.00%			100.00%
Purchase price, net of cash acquired	$ 77,000
Gross purchase price	$ 77,305
Certified Thermoplastics Co., LLC
Segment Reporting Information [Line Items]
Equity interest acquired		100.00%					100.00%
Purchase price, net of cash acquired		$ 30,700
Gross purchase price		$ 30,800
Lightning Diversion Systems, Inc.
Segment Reporting Information [Line Items]
Equity interest acquired			100.00%
Purchase price, net of cash acquired			$ 60,000
Gross purchase price			$ 62,000

Business Segment Information - Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net Revenues	$ 186,926	$ 181,101	$ 180,495	$ 172,566	$ 164,183	$ 159,842	$ 154,827	$ 150,455	$ 721,088	$ 629,307	$ 558,183
Operating Income									56,233	23,918	15,634
Depreciation and amortization									28,305	25,296	22,845
Capital Expenditures									18,846	16,337	26,473
Electronic Systems
Segment Reporting Information [Line Items]
Net Revenues									360,373	337,868
Structural Systems
Segment Reporting Information [Line Items]
Net Revenues									360,715	291,439
Operating Segments
Segment Reporting Information [Line Items]
Operating Income									85,449	49,979	37,026
Operating Segments \| Electronic Systems
Segment Reporting Information [Line Items]
Net Revenues									360,373	337,868	316,723
Operating Income									38,613	30,916	31,236
Depreciation and amortization									14,170	14,223	13,888
Capital Expenditures									5,508	6,719	5,019
Operating Segments \| Structural Systems
Segment Reporting Information [Line Items]
Net Revenues									360,715	291,439	241,460
Operating Income									46,836	19,063	5,790
Depreciation and amortization									13,663	10,525	8,860
Capital Expenditures									13,338	9,104	20,679
Corporate Administration
Segment Reporting Information [Line Items]
Corporate General and Administrative Expenses									(29,216)	(26,061)	(21,392)
Depreciation and amortization									472	548	97
Capital Expenditures									$ 0	$ 514	$ 775

Business Segment Information - Segment Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total Assets	$ 790,429	$ 644,739
Goodwill and Intangibles	309,279	248,149
Operating Segments \| Electronic Systems
Segment Reporting Information [Line Items]
Total Assets	411,981	405,743
Goodwill and Intangibles	210,453	219,872
Operating Segments \| Structural Systems
Segment Reporting Information [Line Items]
Total Assets	328,718	220,993
Goodwill and Intangibles	98,826	28,277
Corporate Administration
Segment Reporting Information [Line Items]
Total Assets	$ 49,730	$ 18,003

Supplemental Quarterly Financial Data (Unaudited) - (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Net Revenues	$ 186,926	$ 181,101	$ 180,495	$ 172,566	$ 164,183	$ 159,842	$ 154,827	$ 150,455	$ 721,088	$ 629,307	$ 558,183
Gross Profit	40,111	38,327	38,065	35,694	32,697	31,116	32,028	26,755	152,197	122,596	103,133
Income Before Taxes	9,848	10,240	9,178	8,497	1,791	4,290	1,833	2,357	37,763	10,271	7,609
Income Tax Expense (Benefit)	977	1,937	1,363	1,025	1,118	119	242	(243)	5,302	1,236	(12,468)
Net Income	$ 8,871	$ 8,303	$ 7,815	$ 7,472	$ 673	$ 4,171	$ 1,591	$ 2,600	$ 32,461	$ 9,035	$ 20,077
Earnings Per Share
Basic earnings (loss) per share (in dollars per share)	$ 0.77	$ 0.72	$ 0.68	$ 0.65	$ 0.06	$ 0.37	$ 0.14	$ 0.23	$ 2.82	$ 0.79	$ 1.78
Diluted earnings (loss) per share (in dollars per share)	$ 0.75	$ 0.70	$ 0.66	$ 0.64	$ 0.06	$ 0.36	$ 0.14	$ 0.22	$ 2.75	$ 0.77	$ 1.74

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Supplemental Quarterly Financial Data (Unaudited) - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Oct. 08, 2019	Apr. 30, 2018
Segment Reporting Information [Line Items]
Restructuring charges	$ 3,800	$ 3,400	$ 5,400	$ 2,200	$ 0	$ 14,671	$ 8,360
Nobles Worldwide, Inc.
Segment Reporting Information [Line Items]
Equity interest acquired					100.00%			100.00%
Certified Thermoplastics Co., LLC
Segment Reporting Information [Line Items]
Equity interest acquired			100.00%						100.00%

Consolidated Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 1,135	$ 868	$ 495
Additions Charged to Costs and Expenses	219	776	334
Deductions	33	509
Recoveries			(39)
Other	0	0	0
Balance at End of Period	1,321	1,135	868
Valuation Allowance of Deferred Tax Assets
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	9,083	9,013	6,607
Additions Charged to Costs and Expenses	(593)	70	2,406
Deductions	0	0	0
Other	885	0	0
Balance at End of Period	$ 9,375	$ 9,083	$ 9,013

Indemnifications	12 Months Ended
Indemnifications	Dec. 31, 2019
Disclosure of Guarantees and Indemnifications [Abstract]
Indemnifications	Indemnifications We have made guarantees and indemnities under which we may be required to make payments to a guaranteed or indemnified party, in relation to certain transactions, including revenue transactions in the ordinary course of business. In connection with certain performance center leases, we have indemnified our lessors for certain claims arising from the performance center or the lease. We indemnify our directors and officers to the maximum extent permitted under the laws of the State of Delaware. However, we have a directors and officers insurance policy that may reduce our exposure in certain circumstances and may enable us to recover a portion of future amounts that may be payable, if any. The duration of the guarantees and indemnities varies and, in many cases is indefinite but subject to statute of limitations. The majority of guarantees and indemnities do not provide any limitations of the maximum potential future payments we could be obligated to make. Historically, payments related to these guarantees and indemnities have been immaterial. We estimate the fair value of our indemnification obligations as insignificant based on this history and insurance coverage and have, therefore, not recorded any liability for these guarantees and indemnities in the accompanying consolidated balance sheets.

Shareholders' Equity	12 Months Ended
Shareholders' Equity	Dec. 31, 2019
Equity [Abstract]
Shareholders' Equity	Shareholders’ Equity We are authorized to issue five million shares of preferred stock. At December 31, 2019 and 2018, no preferred shares were issued or outstanding.

Label	Element	Value
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 8,665,000
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (264,000)