Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 28, 2019	Oct. 22, 2019
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 28, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Entity Registrant Name	DUCOMMUN INC /DE/
Entity Central Index Key	0000030305
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		11,563,241
Entity Emerging Growth Company	false
Entity Small Business	false

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents	$ 6,381	$ 10,263
Restricted cash	361	0
Accounts receivable, net of allowance for doubtful accounts of $896 and $1,135 at September 28, 2019 and December 31, 2018, respectively	77,002	67,819
Contract assets	102,475	86,665
Inventories	109,848	101,125
Production cost of contracts	10,704	11,679
Other current assets	5,947	6,531
Total Current Assets	312,718	284,082
Property and equipment, net of accumulated depreciation of $164,907 and $154,840 at September 28, 2019 and December 31, 2018, respectively	112,597	107,045
Operating lease right-of-use assets	18,602
Goodwill	136,057	136,057
Intangibles, net	103,977	112,092
Non-current deferred income taxes	313	308
Other assets	5,290	5,155
Total Assets	689,554	644,739
Current Liabilities
Accounts payable	78,310	69,274
Contract liabilities	11,850	17,145
Accrued and other liabilities	37,701	37,786
Operating lease liabilities	2,915
Current portion of long-term debt	2,281	2,330
Total Current Liabilities	133,057	126,535
Long-term debt	222,600	228,868
Non-current operating lease liabilities	17,156
Non-current deferred income taxes	18,107	18,070
Other long-term liabilities	14,855	14,441
Total Liabilities	405,775	387,914
Commitments and contingencies (Notes 10, 12)
Shareholders’ Equity
Common stock - $0.01 par value; 35,000,000 shares authorized; 11,561,987 and 11,417,863 shares issued and outstanding at September 28, 2019 and December 31, 2018, respectively	116	114
Additional paid-in capital	86,828	83,712
Retained earnings	203,682	180,356
Accumulated other comprehensive loss	(6,847)	(7,357)
Total Shareholders’ Equity	283,779	256,825
Total Liabilities and Shareholders’ Equity	$ 689,554	$ 644,739

Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Income Statement [Abstract]
Net Revenues	$ 181,101	$ 159,842	$ 534,162	$ 465,124
Cost of Sales	142,774	128,726	422,076	375,225
Gross Profit	38,327	31,116	112,086	89,899
Selling, General and Administrative Expenses	23,724	20,956	71,031	61,476
Restructuring Charges	0	3,373	0	10,784
Operating Income	14,603	6,787	41,055	17,639
Interest Expense	(4,363)	(2,497)	(13,140)	(9,159)
Income Before Taxes	10,240	4,290	27,915	8,480
Income Tax Expense	1,937	119	4,325	118
Net Income	$ 8,303	$ 4,171	$ 23,590	$ 8,362
Earnings Per Share
Basic earnings per share (in dollars per share)	$ 0.72	$ 0.37	$ 2.05	$ 0.73
Diluted earnings per share (in dollars per share)	$ 0.70	$ 0.36	$ 2.00	$ 0.72
Weighted-Average Number of Common Shares Outstanding
Basic (in shares)	11,551	11,404	11,501	11,382
Diluted (in shares)	11,794	11,683	11,784	11,639

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 896	$ 1,135
Property and equipment, accumulated depreciation	$ 164,907	$ 154,840
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)	11,561,987	11,417,863
Common Stock, shares outstanding (in shares)	11,561,987	11,417,863

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Statement of Comprehensive Income [Abstract]
Net Income	$ 8,303	$ 4,171	$ 23,590	$ 8,362
Other Comprehensive Income, Net of Tax:
Amortization of actuarial loss and prior service costs, net of tax of $(51) and $(45) for the three months ended September 28, 2019 and September 29, 2018, respectively, and $(154) and $(134) for the nine months ended September 28, 2019 and September 29, 2018, respectively	170	140	510	423
Change in unrealized gains and losses on cash flow hedges, net of tax of $(29) and $(16) for the three months ended September 28, 2019 and September 29, 2018, respectively, and $(2) and $(104) for the nine months ended September 28, 2019 and September 29, 2018, respectively	91		0
Change in unrealized gains and losses on cash flow hedges, net of tax of $(29) and $(16) for the three months ended September 28, 2019 and September 29, 2018, respectively, and $(2) and $(104) for the nine months ended September 28, 2019 and September 29, 2018, respectively		129		594
Other Comprehensive Income, Net of Tax	261	269	510	1,017
Comprehensive Income	$ 8,564	$ 4,440	$ 24,100	$ 9,379

- Definition

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

+ References + Details

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Statement of Comprehensive Income [Abstract]
Amortization of actuarial losses and prior service costs, tax benefits	$ 51	$ 45	$ 154	$ 134
Change in unrealized gains and losses on cash flow hedges, tax benefit	$ 29		$ 2
Change in unrealized gains and losses on cash flow hedges, tax benefit		$ 16		$ 104

Condensed Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock Including Additional Paid in Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance at Dec. 31, 2017		$ 80,336	$ 161,364	$ (6,117)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised		1,397
Stock awards vested		2,724
Stock repurchased related to the exercise of stock options		(5,467)
Stock-based compensation		3,571
Net Income	$ 8,362
Other Comprehensive Income, Net of Tax	1,017			1,017
Ending Balance at Sep. 29, 2018	255,826	82,561	179,683	(6,418)
Beginning Balance at Jun. 30, 2018		81,445	175,512	(6,687)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock options exercised		539
Stock awards vested		7
Stock repurchased related to the exercise of stock options		(729)
Stock-based compensation		1,299
Net Income	4,171
Other Comprehensive Income, Net of Tax	269			269
Ending Balance at Sep. 29, 2018	255,826	82,561	179,683	(6,418)
Beginning Balance at Dec. 31, 2018	256,825	83,826	180,356	(7,357)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee Stock Purchase Plan		1,118
Stock options exercised		1,409
Stock awards vested		6,665
Stock repurchased related to the exercise of stock options		(11,396)
Stock-based compensation		5,322
Net Income	23,590
Other Comprehensive Income, Net of Tax	510			510
Ending Balance at Sep. 28, 2019	283,779	86,944	203,682	(6,847)
Beginning Balance at Jun. 29, 2019		83,959	195,379	(7,108)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Employee Stock Purchase Plan		1,118
Stock options exercised		570
Stock awards vested		30
Stock repurchased related to the exercise of stock options		(784)
Stock-based compensation		2,051
Net Income	8,303
Other Comprehensive Income, Net of Tax	261			261
Ending Balance at Sep. 28, 2019	$ 283,779	$ 86,944	$ 203,682	$ (6,847)

- Definition

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

+ References + Details

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018
Cash Flows from Operating Activities
Net Income	$ 23,590	$ 8,362
Net Cash Provided by Operating Activities:
Depreciation and amortization	20,751	18,635
Non-cash operating lease cost	1,972
Property and equipment impairment due to restructuring	0	5,784
Stock-based compensation expense	5,322	3,414
Deferred income taxes	113	3,446
(Recovery of) provision for doubtful accounts	(239)	344
Other	152	9,275
Changes in Assets and Liabilities:
Accounts receivable	(8,944)	10,771
Contract assets	(15,810)	(88,066)
Inventories	(8,723)	22,909
Production cost of contracts	(1,537)	(1,447)
Other assets	525	3,709
Accounts payable	8,806	22,610
Contract liabilities	(5,295)	15,108
Accrued and other liabilities	(614)	(1,452)
Net Cash Provided by Operating Activities	20,069	33,402
Cash Flows from Investing Activities
Purchases of property and equipment	(14,698)	(12,796)
Proceeds from sale of assets	0	117
Payments for acquisition of Certified Thermoplastics Co., LLC, net of cash acquired	0	(30,711)
Net Cash Used in Investing Activities	(14,698)	(43,390)
Cash Flows from Financing Activities
Borrowings from senior secured revolving credit facility	163,500	239,700
Repayments of senior secured revolving credit facility	(163,500)	(227,100)
Repayments of term loan	(6,570)	0
Repayments of other debt and finance lease obligations	(118)	0
Net cash paid upon issuance of common stock under stock plans	(2,204)	(1,189)
Net Cash (Used in) Provided by Financing Activities	(8,892)	11,411
Net (Decrease) Increase in Cash, Cash Equivalents, and Restricted Cash	(3,521)	1,423
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	10,263	2,150
Cash, Cash Equivalents, and Restricted Cash at End of Period	$ 6,742	$ 3,573

Summary of Significant Accounting Policies

9 Months Ended

Sep. 28, 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 unaudited condensed 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. The December 31, 2018 condensed consolidated balance sheet data was derived from audited financial statements, but does not contain all disclosures required by accounting principles generally accepted in the United States of America (“GAAP”).

Our significant accounting policies were described in Part IV, Item 15(a)(1), “Note 1. Summary of Significant Accounting Policies” in our Annual Report on Form 10-K for the year ended December 31, 2018. We followed the same accounting policies for interim reporting except for the change in our lease accounting practices described below. The financial information included in this Quarterly Report on Form 10-Q should be read in conjunction with our Annual Report on Form 10-K for the year ended December 31, 2018.

In the opinion of management, all adjustments, consisting of recurring accruals, have been made that are necessary to fairly state our condensed consolidated financial position, statements of income, comprehensive income and cash flows in accordance with GAAP for the periods covered by this Quarterly Report on Form 10-Q. The results of operations for the three and nine months ended September 28, 2019 are not necessarily indicative of the results to be expected for the full year ending December 31, 2019.

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.

Certain reclassifications have been made to prior period amounts to conform to the current year’s presentation.

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 condensed 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.

Use of Estimates

Certain amounts and disclosures included in the unaudited condensed consolidated financial statements require management to make estimates and judgments that affect the amounts 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 may differ from these estimates.

Supplemental Cash Flow Information



	(In thousands)
	Nine Months Ended
	September 28, 2019		September 29, 2018
Interest paid	$	11,597	$	8,073
Taxes paid	$	4,610	$	195
Non-cash activities:
Purchases of property and equipment not paid	$	1,054	$	970

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 any 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)				(In thousands, except per share data)
	Three Months Ended				Nine Months Ended
	September 28, 2019		September 29, 2018		September 28, 2019		September 29, 2018
Net income	$	8,303	$	4,171	$	23,590	$	8,362
Weighted-average number of common shares outstanding
Basic weighted-average common shares outstanding	11,551		11,404		11,501		11,382
Dilutive potential common shares	243		279		283		257
Diluted weighted-average common shares outstanding	11,794		11,683		11,784		11,639
Earnings per share
Basic	$	0.72	$	0.37	$	2.05	$	0.73
Diluted	$	0.70	$	0.36	$	2.00	$	0.72

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)

Three Months Ended

Nine Months Ended

September 28,
2019

September 29,
2018

September 28,
2019

September 29,
2018

Stock options and stock units

206

171

100

216

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 as of September 28, 2019 is less than $0.1 million and is included as other current assets.

There were no transfers between Level 1, Level 2, or Level 3 financial instruments in the three months ended September 28, 2019.

Cash and 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.

Restricted Cash

Restricted cash consists of cash withheld from our employees’ salary who have enrolled in our employee stock purchase plan (“ESPP”). An offering period is six months and each employee determines the percentage of their salary that will be withheld during that six month offering period. At the end of the six month offering period, the amounts withheld will be used to purchase our Company’s stock at a discounted price. Employees have the option to withdraw from the ESPP during the six month offering period and the cash withheld to date will be returned to the employee.

Derivative Instruments

We recognize derivative instruments on our condensed 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 September 28, 2019, 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 condensed 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. For the three and nine months ended September 28, 2019, the impact of cash flow hedges in the respective periods were 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 condensed consolidated balance sheets and recognize subsequent changes in its fair value in our current period earnings.

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 facility 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.

Accumulated Other Comprehensive Loss

Accumulated other comprehensive loss, as reflected on the condensed 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.

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 condensed consolidated balance sheets.

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.

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. In the event the customer invokes a termination for convenience clause, we would be entitled to costs incurred to date plus a reasonable profit. The majority of our revenues are recognized over time. Contract costs typically include labor, materials, overhead, and when applicable, subcontractor costs.

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 during the three and nine months ended for both September 28, 2019 and September 29, 2018.

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:



	(In thousands)
	September 28, 2019		December 31, 2018
Contract assets	$	102,475	$	86,665
Contract liabilities	$	11,850	$	17,145

Remaining performance obligations are defined as customer placed purchase orders (“POs”) with firm fixed price and firm delivery dates. Our remaining performance obligations as of September 28, 2019 totaled $682.2 million. We anticipate recognizing an estimated 70% of our remaining performance obligations as revenue during the next 12 months with the remaining performance obligations being recognized in the remainder of 2020 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:



	(In thousands)				(In thousands)
	Three Months Ended				Nine Months Ended
	September 28 2019		September 29, 2018		September 28 2019		September 29, 2018
Consolidated Ducommun
Military and space	$	80,487	$	71,459	$	231,635	$	208,140
Commercial aerospace	88,922		76,343		269,080		219,019
Industrial	11,692		12,040		33,447		37,965
Total	$	181,101	$	159,842	$	534,162	$	465,124

Electronic Systems
Military and space	$	59,081	$	54,068	$	176,813	$	160,969
Commercial aerospace	19,815		19,588		53,785		53,672
Industrial	11,692		12,040		33,447		37,965
Total	$	90,588	$	85,696	$	264,045	$	252,606

Structural Systems
Military and space	$	21,406	$	17,391	$	54,822	$	47,171
Commercial aerospace	69,107		56,755		215,295		165,347
Total	$	90,513	$	74,146	$	270,117	$	212,518

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 condensed 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 condensed 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 condensed 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 is 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 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 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 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

9 Months Ended

Sep. 28, 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 condensed consolidated balance sheet, including the opening balance of retained earnings in the nine months ended September 28, 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 unaudited condensed consolidated balance sheets was as follows:



	(In thousands)
	December 31, 2018					January 1, 2019
Unaudited Condensed 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 condensed 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 year to 10 years, some of which include options to extend the leases for up to 10 years, and some of which include options to terminate the leases within 1 year.

The components of lease expense for the three and nine months ended September 28, 2019 were as follows:



	(In thousands)
	Three Months Ended		Nine Months Ended
	September 28, 2019		September 28, 2019
Operating leases expense	$	1,041	$	2,960

Finance leases expense:
Amortization of right-of-use assets	$	59	$	159
Interest on lease liabilities	12		32
Total finance lease expense	$	71	$	191

Short term lease expense for the three and nine months ended September 28, 2019 were not material.

Supplemental cash flow information related to leases for the nine months ended September 28, 2019 was as follows:



	(In thousands)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	3,005
Operating cash flows from finance leases	$	32
Financing cash flows from finance leases	$	119

Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$	1,437
Finance leases	$	483

The weighted average remaining lease terms as of September 28, 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 weighted average discount rate as of September 28, 2019 was 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
2019 (Excluding the nine months ended September 28, 2019)	$	1,025	$	60
2020	4,129		242
2021	4,005		229
2022	3,610		92
2023	3,275		53
Thereafter	8,832		73
Total lease payments	24,876		749
Less imputed interest	4,805		84
Total	$	20,071	$	665

Operating lease payments include $11.4 million related to options to extend lease terms that are reasonably certain of being exercised. As of September 28, 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 September 28, 2019, it excludes $2.1 million of legally binding minimum lease payments for leases signed but not yet commenced. These finance leases will commence during 2019 with lease terms of 5 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 unaudited condensed consolidated balance sheets was as follows:



	(In thousands)
	December 31, 2018					January 1, 2019
Unaudited Condensed 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 components of lease expense for the three and nine months ended September 28, 2019 were as follows:



	(In thousands)
	Three Months Ended		Nine Months Ended
	September 28, 2019		September 28, 2019
Operating leases expense	$	1,041	$	2,960

Finance leases expense:
Amortization of right-of-use assets	$	59	$	159
Interest on lease liabilities	12		32
Total finance lease expense	$	71	$	191

Short term lease expense for the three and nine months ended September 28, 2019 were not material.

Supplemental cash flow information related to leases for the nine months ended September 28, 2019 was as follows:



	(In thousands)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	3,005
Operating cash flows from finance leases	$	32
Financing cash flows from finance leases	$	119

Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$	1,437
Finance leases	$	483

The weighted average remaining lease terms as of September 28, 2019 were as follows:



	(In years)
Operating leases	7
Finance leases	4

The weighted average discount rate as of September 28, 2019 was 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
2019 (Excluding the nine months ended September 28, 2019)	$	1,025	$	60
2020	4,129		242
2021	4,005		229
2022	3,610		92
2023	3,275		53
Thereafter	8,832		73
Total lease payments	24,876		749
Less imputed interest	4,805		84
Total	$	20,071	$	665

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	9 Months Ended
Business Combinations	Sep. 28, 2019
Business Combinations [Abstract]
Business Combinations	Business Combinations 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 condensed consolidated statements of income since the date of acquisition as part of the Structural Systems segment. Subsequent to our quarter ended September 28, 2019, on October 8, 2019, we acquired 100.0% of the outstanding equity 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 purchase price was $77.0 million, net of cash acquired, all payable in cash. The acquisition of Nobles advances our strategy to diversify and offer more customized, value-driven engineered products with aftermarket opportunities. We paid $77.3 million upon the closing of the transaction.

Restructuring Activities

9 Months Ended

Sep. 28, 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 $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 have recorded cumulative expenses of $0.2 million for professional service fees which were classified as restructuring charges. Further, we also 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 have 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 and 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.

During the three months ended September 28, 2019, the activities were not significant.

As of September 28, 2019, we have accrued $0.1 million and $0.1 million for severance and benefits and professional service fees in the Electronic Systems segment and Structural Systems segment, respectively.

Our restructuring activities in the nine months ended September 28, 2019 were as follows (in thousands):



	December 31, 2018		Nine Months Ended September 28, 2019									September 28, 2019
	Balance		Cash Payments			Adoption of ASU 842 Adjustment			Change in Estimates			Balance
Severance and benefits	$	2,631	$	(2,493	)	$	—		$	—		$	138
Lease termination	861		(126		)	(735		)	—			—
Professional service fees	43		(43		)	—			—			—
Other	416		(416		)	—			—			—
Total charged to restructuring charges	3,951		(3,078		)	(735		)	—			138
Inventory reserve	50		—			—			(50		)	—
Total charged to cost of sales	50		—			—			(50		)	—
Ending balance	$	4,001	$	(3,078	)	$	(735	)	$	(50	)	$	138

Goodwill

9 Months Ended

Sep. 28, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

We perform our annual goodwill impairment test as of the first day of the fourth 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. 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.

The carrying amounts of our goodwill were as follows:




	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
Balance at September 28, 2019	$	117,435		$	18,622	$	136,057

Long-Term Debt

9 Months Ended

Sep. 28, 2019

Debt Disclosure [Abstract]

Long-Term Debt

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



	(In thousands)
	September 28, 2019			December 31, 2018
Term loan	$	226,429		$	233,000
Revolving credit facility	—			—
Total debt	226,429			233,000
Less current portion	2,281			2,330
Total long-term debt, less current portion	224,148			230,670
Less debt issuance costs - term loan	1,548			1,802
Total long-term debt, net of debt issuance costs - term loan	222,600			228,868
Less debt issuance costs - revolving credit facility ⁽¹⁾	1,669			1,907
Total long-term debt, net of debt issuance costs	$	220,931		$	226,961
Weighted-average interest rate	6.87		%	4.71		%

(1) Included as part of other assets

In November 2018, we completed new credit facilities to replace the credit facilities existing at that time (“Existing Credit Facilities”). The new credit facilities consist of a $240.0 million senior secured term loan, which matures on November 21, 2025 (“New Term Loan”), and a $100.0 million senior secured revolving credit facility (“New Revolving Credit Facility”), which matures on November 21, 2023 (collectively, the “New Credit Facilities”).

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 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 New Term Loan requires installment payments of 0.25% of the outstanding principal balance of the New Term Loan amount on a quarterly basis. We made an aggregate total of $0.6 million and $6.6 million of voluntary and mandatory principal prepayments under the New Term Loan during the three and nine months ended September 28, 2019, respectively.

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 1.75% 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 New Revolving Credit Facility is subject to a commitment fee ranging from 0.20% to 0.30%, based upon the consolidated total net adjusted leverage ratio.

Further, if we meet the annual excess cash flow threshold, we will be required to make excess cash 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 September 28, 2019, we were in compliance with all covenants required under the New Credit Facilities.

We had been making periodic voluntary principal prepayments on our Existing Credit Facilities and in conjunction with the closing of the New Credit Facilities on November 21, 2018, we drew down $240.0 million on the New Term Loan, $7.9 million on the New Revolving Credit Facility and used those proceeds along with current cash on hand to pay off the Existing Credit Facilities of $247.9 million. The New Term Loan replacing the term loan that was a part of the Existing Credit Facilities (“Existing Term Loan”) was considered an extinguishment of debt except for the portion related to a creditor that was part of the Existing Term Loan and the New 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 Existing Term Loan that was considered an extinguishment of debt of $0.4 million. In addition, the New Revolving Credit Facility replacing the existing revolving credit facility that was part of the Existing Credit Facilities (“Existing Revolving Credit Facility”) was considered an extinguishment of debt except for the portion related to the creditors that were part of the Existing Revolving Credit Facility and the New 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 Existing 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.

Further, we incurred $3.5 million of new debt issuance costs that can be capitalized related to the New Credit Facilities, of which $1.7 million were allocated to the New Term Loan and the $1.8 million was allocated to the New Revolving Credit facility. The New Term Loan new debt issuance costs of $1.7 million and remaining unamortized 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 New Term Loan were capitalized and are being amortized over the seven years life of the New Term Loan. The New Revolving Credit Facility new debt issuance costs of $1.8 million and remaining unamortized 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 New Revolving Credit Facility were capitalized and are being amortized over the five years life of the New Revolving Credit Facility.

Subsequent to our quarter ended September 28, 2019, on October 8, 2019, we acquired 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 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 related to this transaction by drawing down on the Existing Revolving Credit Facility. See Note 3.

As of September 28, 2019, we had $99.8 million of unused borrowing capacity under the 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 domestic 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, and in aggregate, totaling $135.0 million of our debt. We paid a total of $1.0 million in connection with entering into the interest rate cap hedges. See Note 1 for further information.

In December 2018, 2017, and 2016, we entered into agreements to purchase $2.2 million, $14.2 million, and $9.9 million of industrial revenue bonds (“IRBs”) issued by the city of Parsons, Kansas (“Parsons”) and concurrently, sold $2.2 million, $14.2 million, and $9.9 million of property and equipment (“Property”) to Parsons as well as entered into lease agreements to lease the Property from Parsons (“Leases”) with lease payments totaling $2.2 million, $14.2 million, and $9.9 million over the lease terms, respectively. The sale of the Property and concurrent lease back of the Property in December 2018, 2017, and 2016 did not meet the sale-leaseback accounting requirements as a result of control not deemed to have transferred to the buyer-lessor under ASC 842 and our continuous involvement with the Property under ASC 840 and thus, the $2.2 million, $14.2 million, and $9.9 million in cash received from Parsons was not recorded as a sale but as a financing obligation, respectively. Further, the Leases included a right of offset so long as we continue to own the IRBs and thus, the financing obligations of $2.2 million, $14.2 million, and $9.9 million were offset against the $2.2 million, $14.2 million, and $9.9 million, respectively, of IRBs assets and are presented net on the condensed consolidated balance sheets with no impact to the condensed consolidated statements of income or condensed consolidated cash flow statements.

Employee Benefit Plans

9 Months Ended

Sep. 28, 2019

Retirement Benefits [Abstract]

Employee Benefit Plans

The components of net periodic pension expense were as follows:



	(In thousands)						(In thousands)
	Three Months Ended						Nine Months Ended
	September 28, 2019			September 29, 2018			September 28, 2019			September 29, 2018
Service cost	$	126		$	150		$	377		$	450
Interest cost	347			317			1,041			951
Expected return on plan assets	(411		)	(446		)	(1,233		)	(1,338		)
Amortization of actuarial losses	221			185			664			557
Net periodic pension cost	$	283		$	206		$	849		$	620

The components of the reclassifications of net actuarial losses from accumulated other comprehensive loss to net income for the three and nine months ended September 28, 2019 were as follows:



	(In thousands)
	Three Months Ended			Nine Months Ended
	September 28, 2019			September 28, 2019
Amortization of actuarial losses - total before tax ⁽¹⁾	$	221		$	664
Tax benefit	(51		)	(154		)
Net of tax	$	170		$	510


(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.

Indemnifications	9 Months Ended
Indemnifications	Sep. 28, 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 facility leases, we have indemnified our lessors for certain claims arising from our use of the facility under our 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 vary and, in many cases, are subject to statutes 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 amount of our indemnification obligations as insignificant based on this history and insurance coverage and therefore, have not recorded any liability for these guarantees and indemnities on the accompanying condensed consolidated balance sheets. Further, when considered with our insurance coverage, although recorded through different captions on our condensed consolidated balance sheets, the potential impact is further mitigated.

Income Taxes	9 Months Ended
Income Taxes	Sep. 28, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The provision for income taxes is determined using an estimated annual effective tax rate, which is generally less than the U.S. federal statutory rate, primarily due to research and development (“R&D”) tax credits. Our effective tax rate may be subject to fluctuations during the year as new information is obtained, which may affect the assumptions used to estimate the annual effective tax rate, including factors such as expected utilization of R&D tax credits, valuation allowances against deferred tax assets, the recognition or derecognition of tax benefits related to uncertain tax positions, and changes in or the interpretation of tax laws in jurisdictions where we conduct business. Also, excess tax benefits and tax deficiencies related to our equity compensation recognized in the income statement could result in fluctuations in our effective tax rate period-over-period depending on the volatility of our stock price and how many awards vest in the period. We recognize deferred tax assets and liabilities for temporary differences between the financial reporting basis and the tax basis of our assets and liabilities along with net operating loss and tax credit carryovers. We record a valuation allowance against our deferred tax assets to reduce the net carrying value to an amount that we believe is more likely than not to be realized. When we establish or reduce our valuation allowances against our deferred tax assets, the provision for income taxes will increase or decrease, respectively, in the period when that determination is made. We recorded income tax expense of $1.9 million for the three months ended September 28, 2019 compared to $0.1 million for the three months ended September 29, 2018. The increase in income tax expense for the third quarter of 2019 compared to the third quarter of 2018 was primarily due to higher pre-tax income and non-deductible expenses related to officers compensation for the third quarter of 2019 compared to the third quarter of 2018. We recorded income tax expense of $4.3 million for the nine months ended September 28, 2019 compared to $0.1 million for the nine months ended September 29, 2018. The increase in income tax expense for the first nine months of 2019 compared to the first nine months of 2018 was primarily due to higher pre-tax income and non-deductible expenses related to officers compensation for the first nine months of 2019 compared to the first nine months of 2018. The increase in income tax expense was partially offset by higher discrete tax benefits recognized in the first nine months of 2019 for net tax windfalls related to stock-based compensation. Our total amount of unrecognized tax benefits was $5.5 million and $5.3 million as of September 28, 2019 and December 31, 2018, respectively. If recognized, $3.5 million would affect the effective tax rate. We do not reasonably expect significant increases or decreases to our unrecognized tax benefits in the next twelve months.

Contingencies	9 Months Ended
Contingencies	Sep. 28, 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 both September 28, 2019 and December 31, 2018, which is reflected in other long-term liabilities on its condensed consolidated balance sheets. 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 September 28, 2019, which is reflected in other long-term liabilities on its condensed 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 in the ordinary course of business. 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 condensed consolidated financial position, results of operations or cash flows.

Business Segment Information

9 Months Ended

Sep. 28, 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 a reportable operating segment.

Financial information by reportable operating segment was as follows:



	(In thousands) Three Months Ended						(In thousands) Nine Months Ended
	September 28, 2019			September 29, 2018			September 28, 2019			September 29, 2018
Net Revenues
Electronic Systems	$	90,588		$	85,696		$	264,045		$	252,606
Structural Systems	90,513			74,146			270,117			212,518
Total Net Revenues	$	181,101		$	159,842		$	534,162		$	465,124
Segment Operating Income
Electronic Systems	$	9,657		$	9,050		$	28,750		$	23,463
Structural Systems	12,877			3,963			35,199			13,380
	22,534			13,013			63,949			36,843
Corporate General and Administrative Expenses ⁽¹⁾	(7,931		)	(6,226		)	(22,894		)	(19,204		)
Operating Income	$	14,603		$	6,787		$	41,055		$	17,639
Depreciation and Amortization Expenses
Electronic Systems	$	3,569		$	3,707		$	10,602		$	11,022
Structural Systems	3,350			2,576			9,750			7,510
Corporate Administration	73			37			399			103
Total Depreciation and Amortization Expenses	$	6,992		$	6,320		$	20,751		$	18,635
Capital Expenditures
Electronic Systems	$	1,768		$	879		$	4,820		$	5,091
Structural Systems	2,747			3,935			10,108			6,565
Corporate Administration	—			185			—			375
Total Capital Expenditures	$	4,515		$	4,999		$	14,928		$	12,031


(1)	Includes costs not allocated to either the Electronic Systems or Structural Systems operating segments.

Segment assets include assets directly identifiable to or allocated to each segment. Our segment assets are as follows:



	(In thousands)
	September 28, 2019		December 31, 2018
Total Assets
Electronic Systems	$	418,187	$	405,743
Structural Systems	254,171		220,993
Corporate Administration ⁽¹⁾	17,196		18,003
Total Assets	$	689,554	$	644,739
Goodwill and Intangibles
Electronic Systems	$	212,808	$	219,872
Structural Systems	27,226		28,277
Total Goodwill and Intangibles	$	240,034	$	248,149


(1)	Includes assets not specifically identified to or allocated to either the Electronic Systems or Structural Systems operating segments, including cash and cash equivalents.

Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 28, 2019

Accounting Policies [Abstract]

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 is 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

Earnings Per Share

Fair Value

Cash and Cash Equivalents

Restricted Cash

Derivatives Instruments

Derivative Instruments

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 during the three and nine months ended for both September 28, 2019 and September 29, 2018.

Contract Assets and Contract Liabilities

Accumulated Other Comprehensive Loss

Provision for Estimated Losses on Contracts

Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 28, 2019

Accounting Policies [Abstract]

Schedule of Supplemental Cash Flow Information

Supplemental Cash Flow Information



	(In thousands)
	Nine Months Ended
	September 28, 2019		September 29, 2018
Interest paid	$	11,597	$	8,073
Taxes paid	$	4,610	$	195
Non-cash activities:
Purchases of property and equipment not paid	$	1,054	$	970

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)				(In thousands, except per share data)
	Three Months Ended				Nine Months Ended
	September 28, 2019		September 29, 2018		September 28, 2019		September 29, 2018
Net income	$	8,303	$	4,171	$	23,590	$	8,362
Weighted-average number of common shares outstanding
Basic weighted-average common shares outstanding	11,551		11,404		11,501		11,382
Dilutive potential common shares	243		279		283		257
Diluted weighted-average common shares outstanding	11,794		11,683		11,784		11,639
Earnings per share
Basic	$	0.72	$	0.37	$	2.05	$	0.73
Diluted	$	0.70	$	0.36	$	2.00	$	0.72

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

(In thousands)

Three Months Ended

Nine Months Ended

September 28,
2019

September 29,
2018

September 28,
2019

September 29,
2018

Stock options and stock units

206

171

100

216

Contract with Customer, Asset and Liability

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



	(In thousands)
	September 28, 2019		December 31, 2018
Contract assets	$	102,475	$	86,665
Contract liabilities	$	11,850	$	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:



	(In thousands)				(In thousands)
	Three Months Ended				Nine Months Ended
	September 28 2019		September 29, 2018		September 28 2019		September 29, 2018
Consolidated Ducommun
Military and space	$	80,487	$	71,459	$	231,635	$	208,140
Commercial aerospace	88,922		76,343		269,080		219,019
Industrial	11,692		12,040		33,447		37,965
Total	$	181,101	$	159,842	$	534,162	$	465,124

Electronic Systems
Military and space	$	59,081	$	54,068	$	176,813	$	160,969
Commercial aerospace	19,815		19,588		53,785		53,672
Industrial	11,692		12,040		33,447		37,965
Total	$	90,588	$	85,696	$	264,045	$	252,606

Structural Systems
Military and space	$	21,406	$	17,391	$	54,822	$	47,171
Commercial aerospace	69,107		56,755		215,295		165,347
Total	$	90,513	$	74,146	$	270,117	$	212,518

Adoption of Accounting Standards Codification 842 (Tables)

9 Months Ended

Sep. 28, 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 unaudited condensed consolidated balance sheets was as follows:



	(In thousands)
	December 31, 2018					January 1, 2019
Unaudited Condensed 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 three and nine months ended September 28, 2019 were as follows:



	(In thousands)
	Three Months Ended		Nine Months Ended
	September 28, 2019		September 28, 2019
Operating leases expense	$	1,041	$	2,960

Finance leases expense:
Amortization of right-of-use assets	$	59	$	159
Interest on lease liabilities	12		32
Total finance lease expense	$	71	$	191

The weighted average discount rate as of September 28, 2019 was as follows:



Operating leases	6.5	%
Finance leases	6.5	%

Supplemental cash flow information related to leases for the nine months ended September 28, 2019 was as follows:



	(In thousands)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	3,005
Operating cash flows from finance leases	$	32
Financing cash flows from finance leases	$	119

Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$	1,437
Finance leases	$	483

The weighted average remaining lease terms as of September 28, 2019 were as follows:



	(In years)
Operating leases	7
Finance leases	4

Finance Lease, Liability, Maturity

Maturity of operating and finance lease liabilities are as follows:



	(In thousands)
	Operating Leases		Finance Leases
2019 (Excluding the nine months ended September 28, 2019)	$	1,025	$	60
2020	4,129		242
2021	4,005		229
2022	3,610		92
2023	3,275		53
Thereafter	8,832		73
Total lease payments	24,876		749
Less imputed interest	4,805		84
Total	$	20,071	$	665

Lessee, Operating Lease, Liability, Maturity

Maturity of operating and finance lease liabilities are as follows:



	(In thousands)
	Operating Leases		Finance Leases
2019 (Excluding the nine months ended September 28, 2019)	$	1,025	$	60
2020	4,129		242
2021	4,005		229
2022	3,610		92
2023	3,275		53
Thereafter	8,832		73
Total lease payments	24,876		749
Less imputed interest	4,805		84
Total	$	20,071	$	665

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

Restructuring Activities (Tables)

9 Months Ended

Sep. 28, 2019

Restructuring and Related Activities [Abstract]

Schedule of Restructuring Activities

Our restructuring activities in the nine months ended September 28, 2019 were as follows (in thousands):



	December 31, 2018		Nine Months Ended September 28, 2019									September 28, 2019
	Balance		Cash Payments			Adoption of ASU 842 Adjustment			Change in Estimates			Balance
Severance and benefits	$	2,631	$	(2,493	)	$	—		$	—		$	138
Lease termination	861		(126		)	(735		)	—			—
Professional service fees	43		(43		)	—			—			—
Other	416		(416		)	—			—			—
Total charged to restructuring charges	3,951		(3,078		)	(735		)	—			138
Inventory reserve	50		—			—			(50		)	—
Total charged to cost of sales	50		—			—			(50		)	—
Ending balance	$	4,001	$	(3,078	)	$	(735	)	$	(50	)	$	138

Inventories (Tables)

9 Months Ended

Sep. 28, 2019

Inventory Disclosure [Abstract]

Summary of Inventories

Inventories consisted of the following:



	(In thousands)
	September 28, 2019		December 31, 2018
Raw materials and supplies	$	97,551	$	89,767
Work in process	9,459		9,199
Finished goods	2,838		2,159
Total	$	109,848	$	101,125

Long-Term Debt (Tables)

9 Months Ended

Sep. 28, 2019

Debt Disclosure [Abstract]

Long Term Debt Summary

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



	(In thousands)
	September 28, 2019			December 31, 2018
Term loan	$	226,429		$	233,000
Revolving credit facility	—			—
Total debt	226,429			233,000
Less current portion	2,281			2,330
Total long-term debt, less current portion	224,148			230,670
Less debt issuance costs - term loan	1,548			1,802
Total long-term debt, net of debt issuance costs - term loan	222,600			228,868
Less debt issuance costs - revolving credit facility ⁽¹⁾	1,669			1,907
Total long-term debt, net of debt issuance costs	$	220,931		$	226,961
Weighted-average interest rate	6.87		%	4.71		%

(1) Included as part of other assets

- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-Section 50
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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-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
-SubTopic 470
-Section 50
-Paragraph 3
-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

Employee Benefit Plans (Tables)

9 Months Ended

Sep. 28, 2019

Retirement Benefits [Abstract]

Components of Net Periodic Pension Cost

The components of net periodic pension expense were as follows:



	(In thousands)						(In thousands)
	Three Months Ended						Nine Months Ended
	September 28, 2019			September 29, 2018			September 28, 2019			September 29, 2018
Service cost	$	126		$	150		$	377		$	450
Interest cost	347			317			1,041			951
Expected return on plan assets	(411		)	(446		)	(1,233		)	(1,338		)
Amortization of actuarial losses	221			185			664			557
Net periodic pension cost	$	283		$	206		$	849		$	620

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 the three and nine months ended September 28, 2019 were as follows:



	(In thousands)
	Three Months Ended			Nine Months Ended
	September 28, 2019			September 28, 2019
Amortization of actuarial losses - total before tax ⁽¹⁾	$	221		$	664
Tax benefit	(51		)	(154		)
Net of tax	$	170		$	510


(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.

Business Segment Information (Tables)

9 Months Ended

Sep. 28, 2019

Segment Reporting [Abstract]

Financial Information by Reportable Segment

Financial information by reportable operating segment was as follows:



	(In thousands) Three Months Ended						(In thousands) Nine Months Ended
	September 28, 2019			September 29, 2018			September 28, 2019			September 29, 2018
Net Revenues
Electronic Systems	$	90,588		$	85,696		$	264,045		$	252,606
Structural Systems	90,513			74,146			270,117			212,518
Total Net Revenues	$	181,101		$	159,842		$	534,162		$	465,124
Segment Operating Income
Electronic Systems	$	9,657		$	9,050		$	28,750		$	23,463
Structural Systems	12,877			3,963			35,199			13,380
	22,534			13,013			63,949			36,843
Corporate General and Administrative Expenses ⁽¹⁾	(7,931		)	(6,226		)	(22,894		)	(19,204		)
Operating Income	$	14,603		$	6,787		$	41,055		$	17,639
Depreciation and Amortization Expenses
Electronic Systems	$	3,569		$	3,707		$	10,602		$	11,022
Structural Systems	3,350			2,576			9,750			7,510
Corporate Administration	73			37			399			103
Total Depreciation and Amortization Expenses	$	6,992		$	6,320		$	20,751		$	18,635
Capital Expenditures
Electronic Systems	$	1,768		$	879		$	4,820		$	5,091
Structural Systems	2,747			3,935			10,108			6,565
Corporate Administration	—			185			—			375
Total Capital Expenditures	$	4,515		$	4,999		$	14,928		$	12,031


(1)	Includes costs not allocated to either the Electronic Systems or Structural Systems operating segments.

Segment Assets

Our segment assets are as follows:



	(In thousands)
	September 28, 2019		December 31, 2018
Total Assets
Electronic Systems	$	418,187	$	405,743
Structural Systems	254,171		220,993
Corporate Administration ⁽¹⁾	17,196		18,003
Total Assets	$	689,554	$	644,739
Goodwill and Intangibles
Electronic Systems	$	212,808	$	219,872
Structural Systems	27,226		28,277
Total Goodwill and Intangibles	$	240,034	$	248,149


(1)	Includes assets not specifically identified to or allocated to either the Electronic Systems or Structural Systems operating segments, including cash and cash equivalents.

Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 28, 2019 USD ($) Segment	Jan. 01, 2019 USD ($)
Accounting Policies [Abstract]
Number of reportable segments \| Segment	2
Unamortized premium (less than)	$ 0.1
Remaining performance obligation	$ 682.2
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Cumulative impact to retained earnings		$ (0.3)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-09-29
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, percentage	70.00%
Remaining performance obligation, period	12 months

Summary of Significant Accounting Policies - Supplemental Cash Flow Items (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018
Supplemental Disclosures of Cash Flow Information
Interest paid	$ 11,597	$ 8,073
Taxes paid	4,610	195
Non-cash activities:
Purchases of property and equipment not paid	$ 1,054	$ 970

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		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Accounting Policies [Abstract]
Net income	$ 8,303	$ 4,171	$ 23,590	$ 8,362
Weighted-average number of common shares outstanding
Basic weighted-average common shares outstanding (in shares)	11,551	11,404	11,501	11,382
Dilutive potential common shares (in shares)	243	279	283	257
Diluted weighted-average common shares outstanding (in shares)	11,794	11,683	11,784	11,639
Earnings per share
Basic (in dollars per share)	$ 0.72	$ 0.37	$ 2.05	$ 0.73
Diluted (in dollars per share)	$ 0.70	$ 0.36	$ 2.00	$ 0.72

- Definition

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

+ References

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+ Details

- 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.

+ References

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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

Summary of Significant Accounting Policies - Weighted Average Number of Shares Outstanding Excluded from Computation of Diluted Earnings (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Stock options and stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive stock options and stock units to purchase common stock (in shares)	206	171	100	216

Summary of Significant Accounting Policies - Contract Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Contract assets	$ 102,475	$ 86,665
Contract liabilities	$ 11,850	$ 17,145

Summary of Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 181,101	$ 159,842	$ 534,162	$ 465,124
Military and space
Disaggregation of Revenue [Line Items]
Revenue	80,487	71,459	231,635	208,140
Commercial Aerospace
Disaggregation of Revenue [Line Items]
Revenue	88,922	76,343	269,080	219,019
Industrial
Disaggregation of Revenue [Line Items]
Revenue	11,692	12,040	33,447	37,965
Electronic Systems
Disaggregation of Revenue [Line Items]
Revenue	90,588	85,696	264,045	252,606
Electronic Systems \| Military and space
Disaggregation of Revenue [Line Items]
Revenue	59,081	54,068	176,813	160,969
Electronic Systems \| Commercial Aerospace
Disaggregation of Revenue [Line Items]
Revenue	19,815	19,588	53,785	53,672
Electronic Systems \| Industrial
Disaggregation of Revenue [Line Items]
Revenue	11,692	12,040	33,447	37,965
Structural Systems
Disaggregation of Revenue [Line Items]
Revenue	90,513	74,146	270,117	212,518
Structural Systems \| Military and space
Disaggregation of Revenue [Line Items]
Revenue	21,406	17,391	54,822	47,171
Structural Systems \| Commercial Aerospace
Disaggregation of Revenue [Line Items]
Revenue	$ 69,107	$ 56,755	$ 215,295	$ 165,347

Adoption of Accounting Standards Codification 842 - Balance Sheet (Details) - USD ($) $ in Thousands	Sep. 28, 2019	Jan. 01, 2019	Dec. 31, 2018
Assets
Other current assets	$ 5,947	$ 6,323	$ 6,531
Operating lease right-of-use assets	18,602	18,985
Non-current deferred income taxes	313	313	308
Other assets	5,290	5,409	5,155
Liabilities
Operating lease liabilities	2,915	2,544
Accrued and other liabilities	37,701	37,457	37,786
Non-current operating lease liabilities	17,156	18,117
Non-current deferred income taxes	18,107	17,994	18,070
Other long-term liabilities	14,855	13,485	14,441
Shareholders’ Equity
Retained earnings	$ 203,682	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)	9 Months Ended
	Sep. 28, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Lease renewal term	10 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	$ 2,100,000
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term	1 year
Finance lease, lease not yet commenced, term of contract	5 years
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term	10 years
Finance lease, lease not yet commenced, term of contract	10 years

Adoption of Accounting Standards Codification 842 - Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 28, 2019	Sep. 28, 2019
Leases [Abstract]
Operating leases expense	$ 1,041	$ 2,960
Finance leases expense:
Amortization of right-of-use assets	59	159
Interest on lease liabilities	12	32
Total finance lease expense	$ 71	$ 191

Adoption of Accounting Standards Codification 842 - Supplemental Cash Flow (Details) $ in Thousands	9 Months Ended
	Sep. 28, 2019 USD ($)
Leases [Abstract]
Operating cash flows from operating leases	$ 3,005
Operating cash flows from finance leases	32
Financing cash flows from finance leases	119
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	1,437
Finance leases	$ 483

Adoption of Accounting Standards Codification 842 - Weighted Average Remaining Lease Term and Discount Rate (Details)	Sep. 28, 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	Sep. 28, 2019 USD ($)
Operating Leases
2019 (Excluding the nine months ended September 28, 2019)	$ 1,025
2020	4,129
2021	4,005
2022	3,610
2023	3,275
Thereafter	8,832
Total lease payments	24,876
Less imputed interest	4,805
Total	20,071
Finance Leases
2019 (Excluding the nine months ended September 28, 2019)	60
2020	242
2021	229
2022	92
2023	53
Thereafter	73
Total lease payments	749
Less imputed interest	84
Total	$ 665

Adoption of Accounting Standards Codification 842 - Prior Year Future Minimum Lease Payments (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Leases [Abstract]
2019	$ 3,680
2020	3,405
2021	2,789
2022	1,404
2023	980
Thereafter	580
Total	$ 12,838

Business Combinations - Narrative (Details) - USD ($) $ in Thousands		1 Months Ended	9 Months Ended
	Oct. 08, 2019	Apr. 30, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 31, 2018
Business Acquisition [Line Items]
Purchase price of acquisition			$ 0	$ 30,711
Goodwill			$ 136,057		$ 136,057
Certified Thermoplastics Co., LLC
Business Acquisition [Line Items]
Percentage of outstanding common stock acquired		100.00%
Purchase price of acquisition		$ 30,700
Payments to acquire business		30,800
Total preliminary purchase price allocation		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
Useful life (in years)		10 years
Certified Thermoplastics Co., LLC \| Customer relationships
Business Acquisition [Line Items]
Intangible assets		$ 6,900
Certified Thermoplastics Co., LLC \| Trade names and trademarks
Business Acquisition [Line Items]
Intangible assets		$ 1,200
Subsequent Event \| Nobles Parent Inc.
Business Acquisition [Line Items]
Percentage of outstanding common stock acquired	100.00%
Purchase price of acquisition	$ 77,000
Payments to acquire business	$ 77,300

Restructuring Activities (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
Restructuring Activities (Detail) - USD ($) $ in Thousands	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	$ 23,600		$ 23,600
Restructuring charges	0	$ 3,373	0	$ 10,784	$ 14,800	$ 8,800
Electronic Systems
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	900		900
Inventory write-down			100
Accrued severance and loss on early exit	100		100
Electronic Systems \| Severance and benefits
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	3,800		3,800
Electronic Systems \| Lease termination
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	900		900
Electronic Systems \| Professional service fees
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	200		200
Electronic Systems \| Property and equipment impairment due to restructuring
Restructuring Cost and Reserve [Line Items]
Non-cash payments			100
Structural Systems
Restructuring Cost and Reserve [Line Items]
Inventory write-down			500
Accrued severance and loss on early exit	100		100
Structural Systems \| Severance and benefits
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	3,000		3,000
Structural Systems \| Property and equipment impairment due to restructuring
Restructuring Cost and Reserve [Line Items]
Non-cash payments			9,800
Structural Systems \| Other restructuring
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	400		400
Corporate Administration \| Severance and benefits
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	1,400		1,400
Corporate Administration \| Professional service fees
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	1,000		1,000
Corporate Administration \| Modification of stock-based compensation awards
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, cost incurred to date	$ 1,400		$ 1,400

Restructuring Activities - Other Restructuring Activities (Details) $ in Thousands	9 Months Ended
	Sep. 28, 2019 USD ($)
Restructuring Reserve [Roll Forward]
Beginning balance	$ 4,001
Cash Payments	(3,078)
Adoption of ASU 842 Adjustment	(735)
Change in Estimates	(50)
Ending balance	138
Restructuring charges
Restructuring Reserve [Roll Forward]
Beginning balance	3,951
Cash Payments	(3,078)
Adoption of ASU 842 Adjustment	(735)
Change in Estimates	0
Ending balance	138
Cost of sales
Restructuring Reserve [Roll Forward]
Beginning balance	50
Cash Payments	0
Adoption of ASU 842 Adjustment	0
Change in Estimates	(50)
Ending balance	0
Severance and benefits
Restructuring Reserve [Roll Forward]
Beginning balance	2,631
Cash Payments	(2,493)
Adoption of ASU 842 Adjustment	0
Change in Estimates	0
Ending balance	138
Lease termination
Restructuring Reserve [Roll Forward]
Beginning balance	861
Cash Payments	(126)
Adoption of ASU 842 Adjustment	(735)
Change in Estimates	0
Ending balance	0
Professional service fees
Restructuring Reserve [Roll Forward]
Beginning balance	43
Cash Payments	(43)
Adoption of ASU 842 Adjustment	0
Change in Estimates	0
Ending balance	0
Other restructuring
Restructuring Reserve [Roll Forward]
Beginning balance	416
Cash Payments	(416)
Adoption of ASU 842 Adjustment	0
Change in Estimates	0
Ending balance	0
Inventory reserve
Restructuring Reserve [Roll Forward]
Beginning balance	50
Cash Payments	0
Adoption of ASU 842 Adjustment	0
Change in Estimates	(50)
Ending balance	$ 0

Inventories (Detail) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 97,551	$ 89,767
Work in process	9,459	9,199
Finished goods	2,838	2,159
Total	$ 109,848	$ 101,125

Goodwill (Detail) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 31, 2018	Apr. 30, 2018
Goodwill [Line Items]
Gross goodwill		$ 217,779
Accumulated goodwill impairment		(81,722)
Goodwill	$ 136,057	136,057
Electronic Systems
Goodwill [Line Items]
Gross goodwill		199,157
Accumulated goodwill impairment		(81,722)
Goodwill	$ 117,435	117,435
Structural Systems
Goodwill [Line Items]
Percentage of fair value in excess of carrying amount	85.00%
Gross goodwill		18,622
Accumulated goodwill impairment		0
Goodwill	$ 18,622	$ 18,622
Certified Thermoplastics Co., LLC
Goodwill [Line Items]
Goodwill			$ 18,600
Certified Thermoplastics Co., LLC \| Structural Systems
Goodwill [Line Items]
Goodwill			$ 18,600

Accrued and Other Liabilities (Detail) - USD ($) $ in Thousands	Sep. 28, 2019	Jan. 01, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Accrued compensation	$ 28,938		$ 29,616
Accrued income tax and sales tax	55		82
Other	8,708		8,088
Total	$ 37,701	$ 37,457	$ 37,786

Long Term Debt - Summary (Detail) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt	$ 226,429	$ 233,000
Less current portion	2,281	2,330
Total long-term debt, less current portion	224,148	230,670
Total long-term debt, net of debt issuance costs	$ 220,931	$ 226,961
Weighted-average interest rate (percent)	6.87%	4.71%
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt	$ 0	$ 0
Less debt issuance costs - term loan	1,669	1,907
Secured Debt
Debt Instrument [Line Items]
Long-term debt	226,429	233,000
Less debt issuance costs - term loan	1,548	1,802
Total long-term debt, net of debt issuance costs	$ 222,600	$ 228,868

Long-Term Debt - Additional information (Detail)		1 Months Ended						3 Months Ended	9 Months Ended		12 Months Ended
Long-Term Debt - Additional information (Detail)	Oct. 08, 2019 USD ($)	Dec. 31, 2018 USD ($)	Nov. 30, 2018 USD ($)	Apr. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Oct. 31, 2015 USD ($)	Sep. 28, 2019 USD ($)	Sep. 28, 2019 USD ($) subsidiary	Sep. 29, 2018 USD ($)	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Repayments of debt									$ 118,000	$ 0
Preliminary purchase price allocation									$ 0	$ 30,711,000
Municipal Bonds
Debt Instrument [Line Items]
Revenue bonds purchased		$ 2,200,000			$ 14,200,000	$ 9,900,000					$ 2,200,000
Parsons, KS
Debt Instrument [Line Items]
Proceeds received from sale of property to be leased back		2,200,000			14,200,000	9,900,000
Total lease liability from assets sold		$ 2,200,000			$ 14,200,000	$ 9,900,000					2,200,000
Interest rate cap
Debt Instrument [Line Items]
Interest rate hedge							$ 135,000,000
Payments made for interest rate hedge							$ 1,000,000
New Term Loan Maturing November 21, 2025
Debt Instrument [Line Items]
Debt issuance costs, line of credit arrangements			$ 1,700,000
Accumulated amortization of debt issuance costs			100,000
Debt issuance costs			$ 1,800,000
Term			7 years
New Revolving Credit Facility Maturing November 21, 2023
Debt Instrument [Line Items]
Debt issuance costs, line of credit arrangements			$ 1,800,000
Accumulated amortization of debt issuance costs			200,000
Debt issuance costs			$ 2,000,000
Term			5 years
New Existing Revolving Credit Facility
Debt Instrument [Line Items]
Amortization of debt issuance costs			$ 500,000
Gain (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, line of credit arrangements			3,500,000
Number of subsidiaries that are not guarantors on debt \| subsidiary									2
Certified Thermoplastics Co., LLC
Debt Instrument [Line Items]
Borrowings from debt				$ 30,800,000
Preliminary purchase price allocation				$ 30,700,000
Secured Debt \| New Term Loan Maturing November 21, 2025
Debt Instrument [Line Items]
Debt amount			$ 240,000,000.0
Prepayment amount of principal outstanding			0.25%
Repayments of debt								$ 600,000	$ 6,600,000
Borrowings from debt			$ 240,000,000
Secured Debt \| New Term Loan Maturing November 21, 2025 \| LIBOR \| Minimum
Debt Instrument [Line Items]
Spread on variable rate			3.75%
Secured Debt \| New Term Loan Maturing November 21, 2025 \| LIBOR \| Maximum
Debt Instrument [Line Items]
Spread on variable rate			4.00%
Secured Debt \| New Term Loan Maturing November 21, 2025 \| Federal Funds Rate
Debt Instrument [Line Items]
Spread on base rate			0.50%
Secured Debt \| New Term Loan Maturing November 21, 2025 \| Eurodollar Rate
Debt Instrument [Line Items]
Spread on base rate			1.00%
Secured Debt \| New Term Loan Maturing November 21, 2025 \| Base Rate \| Minimum
Debt Instrument [Line Items]
Spread on variable rate			3.75%
Secured Debt \| New Term Loan Maturing November 21, 2025 \| Base Rate \| Maximum
Debt Instrument [Line Items]
Spread on variable rate			4.00%
Revolving Credit Facility \| New Revolving Credit Facility Maturing November 21, 2023
Debt Instrument [Line Items]
Debt amount			$ 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 but greater than 2.50			25.00%
Percentage of excess cash flow payment when leverage ratio is less than or equal to 2.50			0.00%
Borrowings from debt			$ 7,900,000
Revolving Credit Facility \| New Revolving Credit Facility Maturing November 21, 2023 \| Minimum
Debt Instrument [Line Items]
Commitment fee			0.20%
Revolving Credit Facility \| New Revolving Credit Facility Maturing November 21, 2023 \| Maximum
Debt Instrument [Line Items]
Commitment fee			0.30%
Revolving Credit Facility \| New Revolving Credit Facility Maturing November 21, 2023 \| LIBOR \| Minimum
Debt Instrument [Line Items]
Spread on variable rate			1.75%
Revolving Credit Facility \| New Revolving Credit Facility Maturing November 21, 2023 \| LIBOR \| Maximum
Debt Instrument [Line Items]
Spread on variable rate			2.75%
Revolving Credit Facility \| New Revolving Credit Facility Maturing November 21, 2023 \| Federal Funds Rate
Debt Instrument [Line Items]
Spread on base rate			0.50%
Revolving Credit Facility \| New Revolving Credit Facility Maturing November 21, 2023 \| Eurodollar Rate
Debt Instrument [Line Items]
Spread on base rate			1.00%
Revolving Credit Facility \| New Revolving Credit Facility Maturing November 21, 2023 \| Base Rate \| Minimum
Debt Instrument [Line Items]
Spread on variable rate			0.75%
Revolving Credit Facility \| New Revolving Credit Facility Maturing November 21, 2023 \| Base Rate \| Maximum
Debt Instrument [Line Items]
Spread on variable rate			1.75%
Revolving Credit Facility \| New Existing Revolving Credit Facility
Debt Instrument [Line Items]
Repayments of debt			$ 247,900,000
Revolving Credit Facility \| New Credit Facilities
Debt Instrument [Line Items]
Remaining borrowing capacity								99,800,000	99,800,000
Outstanding standby letters of credit								$ 200,000	$ 200,000
Subsequent Event \| Nobles Parent Inc.
Debt Instrument [Line Items]
Preliminary purchase price allocation	$ 77,000,000
Subsequent Event \| Nobles Parent Inc. \| New Revolving Credit Facility Maturing November 21, 2023
Debt Instrument [Line Items]
Borrowings from debt	$ 77,300,000

Employee Benefit Plans - Components of Net Periodic Pension Cost for Defined Benefit Pension Plan and Retirement Plan (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Retirement Benefits [Abstract]
Service cost	$ 126	$ 150	$ 377	$ 450
Interest cost	347	317	1,041	951
Expected return on plan assets	(411)	(446)	(1,233)	(1,338)
Amortization of actuarial losses	221	185	664	557
Net periodic pension cost	$ 283	$ 206	$ 849	$ 620

Employee Benefit Plans - Reclassifications from Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 28, 2019	Sep. 28, 2019
Retirement Benefits [Abstract]
Amortization of actuarial loss - total before tax	$ 221	$ 664
Tax benefit	(51)	(154)
Net of tax	$ 170	$ 510

Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Income Taxes (Detail) - USD ($) $ in Thousands	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Income tax expense (benefit)	$ 1,937	$ 119	$ 4,325	$ 118
Unrecognized tax benefits	5,500		5,500		$ 5,300
Expected change in unrecognized tax benefits	$ 3,500		$ 3,500
Maximum
Operating Loss Carryforwards [Line Items]
Income tax expense (benefit)				$ 100

Contingencies (Detail) - Structural Systems - USD ($) $ in Millions	Sep. 28, 2019	Dec. 31, 2018
El Mirage and Monrovia, California
Loss Contingencies [Line Items]
Reserve for estimated liability	$ 1.5	$ 1.5
West Covina, California
Loss Contingencies [Line Items]
Reserve for estimated liability	0.4
Minimum \| West Covina, California
Loss Contingencies [Line Items]
Possible loss	0.4
Maximum \| West Covina, California
Loss Contingencies [Line Items]
Possible loss	$ 3.1

Business Segment Information - Financial Information by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Segment Reporting Information [Line Items]
Net Revenues	$ 181,101	$ 159,842	$ 534,162	$ 465,124
Operating Income	14,603	6,787	41,055	17,639
Depreciation and Amortization Expenses	6,992	6,320	20,751	18,635
Capital Expenditures	4,515	4,999	14,928	12,031
Electronic Systems
Segment Reporting Information [Line Items]
Net Revenues	90,588	85,696	264,045	252,606
Structural Systems
Segment Reporting Information [Line Items]
Net Revenues	90,513	74,146	270,117	212,518
Operating Segments
Segment Reporting Information [Line Items]
Operating Income	22,534	13,013	63,949	36,843
Operating Segments \| Electronic Systems
Segment Reporting Information [Line Items]
Net Revenues	90,588	85,696	264,045	252,606
Operating Income	9,657	9,050	28,750	23,463
Depreciation and Amortization Expenses	3,569	3,707	10,602	11,022
Capital Expenditures	1,768	879	4,820	5,091
Operating Segments \| Structural Systems
Segment Reporting Information [Line Items]
Net Revenues	90,513	74,146	270,117	212,518
Operating Income	12,877	3,963	35,199	13,380
Depreciation and Amortization Expenses	3,350	2,576	9,750	7,510
Capital Expenditures	2,747	3,935	10,108	6,565
Segment Reconciling Items
Segment Reporting Information [Line Items]
Corporate General and Administrative Expenses	(7,931)	(6,226)	(22,894)	(19,204)
Corporate Administration
Segment Reporting Information [Line Items]
Depreciation and Amortization Expenses	73	37	399	103
Capital Expenditures	$ 0	$ 185	$ 0	$ 375

Business Segment Information - Segment Assets (Detail) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Total Assets	$ 689,554	$ 644,739
Total Goodwill and Intangibles	240,034	248,149
Operating Segments \| Electronic Systems
Segment Reporting Information [Line Items]
Total Assets	418,187	405,743
Total Goodwill and Intangibles	212,808	219,872
Operating Segments \| Structural Systems
Segment Reporting Information [Line Items]
Total Assets	254,171	220,993
Total Goodwill and Intangibles	27,226	28,277
Corporate Administration
Segment Reporting Information [Line Items]
Total Assets	$ 17,196	$ 18,003

Label	Element	Value
Accounting Standards Update 2014-09 [Member] \| Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 8,665,000
Accounting Standards Update 2018-02 [Member] \| AOCI Attributable to Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	(1,318,000)
Accounting Standards Update 2018-02 [Member] \| Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	1,292,000
Accounting Standards Update 2016-02 [Member] \| Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (264,000)

Business Segment Information - Additional Information (Detail)	9 Months Ended
	Sep. 28, 2019 Segment
Segment Reporting [Abstract]
Number of reportable segments	2