Document and Entity Information - USD ($) $ in Millions	12 Months Ended
Document and Entity Information - USD ($) $ in Millions	Dec. 31, 2017	Feb. 14, 2018	Jul. 01, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Trading Symbol	DCO
Entity Registrant Name	DUCOMMUN INC /DE/
Entity Central Index Key	0000030305
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		11,340,653
Entity Public Float			$ 357

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents	$ 2,150	$ 7,432
Accounts receivable (less allowance for doubtful accounts of $868 and $495 at December 31, 2017 and 2016, respectively)	74,064	76,239
Inventories	122,161	119,896
Production cost of contracts	11,204	11,340
Other current assets	11,435	11,034
Total Current Assets	221,014	225,941
Property and Equipment, Net	110,252	101,590
Goodwill	117,435	82,554
Intangibles, Net	114,693	101,573
Non-Current Deferred Income Taxes	261	286
Other Assets	3,098	3,485
Total Assets	566,753	515,429
Current Liabilities
Current portion of long-term debt	0	3
Accounts payable	51,907	57,024
Accrued liabilities	28,329	29,279
Total Current Liabilities	80,236	86,306
Long-Term Debt, Less Current Portion	216,055	166,896
Non-Current Deferred Income Taxes	15,981	31,417
Other Long-Term Liabilities	18,898	18,707
Total Liabilities	331,170	303,326
Commitments and Contingencies (Notes 14, 17)
Shareholders’ Equity
Common stock - $0.01 par value; 35,000,000 shares authorized; 11,332,841 and 11,193,813 shares issued and outstanding at December 31, 2017 and 2016, respectively	113	112
Additional paid-in capital	80,223	76,783
Retained earnings	161,364	141,287
Accumulated other comprehensive loss	(6,117)	(6,079)
Total Shareholders’ Equity	235,583	212,103
Total Liabilities and Shareholders’ Equity	$ 566,753	$ 515,429

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 868	$ 495
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	35,000,000	35,000,000
Common stock, shares issued	11,332,841	11,193,813
Common stock, shares outstanding	11,332,841	11,193,813

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net Revenues	$ 558,183	$ 550,642	$ 666,011
Cost of Sales	455,363	444,449	565,219
Gross Profit	102,820	106,193	100,792
Selling, General and Administrative Expenses	79,435	77,443	83,796
Goodwill Impairment	0	0	57,243
Intangible Asset Impairment	0	0	32,937
Restructuring Charges	8,360	182	2,125
Operating Income (Loss)	15,025	28,568	(75,309)
Interest Expense	(8,261)	(8,274)	(18,709)
Gain on Divestitures, Net	0	17,604	0
Loss on Extinguishment of Debt	0	0	(14,720)
Other Income, Net	845	215	2,148
Income (Loss) Before Taxes	7,609	38,113	(106,590)
Income Tax (Benefit) Expense	(12,468)	12,852	(31,711)
Net Income (Loss)	$ 20,077	$ 25,261	$ (74,879)
Earnings (Loss) Per Share
Basic earnings (loss) per share (in dollars per share)	$ 1.78	$ 2.27	$ (6.78)
Diluted earnings (loss) per share (in dollars per share)	$ 1.74	$ 2.24	$ (6.78)
Weighted-Average Number of Shares Outstanding
Basic (in shares)	11,290	11,151	11,047
Diluted (in shares)	11,558	11,299	11,047

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net Income	$ 20,077	$ 25,261	$ (74,879)
Pension Adjustments:
Amortization of actuarial loss included in net income, net of tax benefit of $302, $283, and $330 for 2017, 2016, and 2015, respectively	508	479	557
Actuarial (loss) gain arising during the period, net of tax (benefit) expense of $(194), $(413), and $300 for 2017, 2016, and 2015, respectively	(304)	(650)	491
Decrease in net unrealized gains and losses on cash flow hedges, net of tax benefit of $145, $180, and $0 for 2017, 2016, and 2015, respectively	(242)	(305)	0
Other Comprehensive (Loss) Income, Net of Tax	(38)	(476)	1,048
Comprehensive Income (Loss), Net of Tax	$ 20,039	$ 24,785	$ (73,831)

Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Amortization of actuarial (loss) gain, tax	$ 302	$ 283	$ 330
Actuarial gain (loss) arising during the period, tax expense (benefit)	(194)	(413)	300
Unrealized gain (loss) on cash flow hedges, tax	$ 145	$ 180	$ 0

Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning Balance (in shares) at Dec. 31, 2014		10,952,268
Beginning Balance at Dec. 31, 2014	$ 256,570	$ 110	$ 0	$ 72,206	$ 190,905	$ (6,651)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(74,879)				(74,879)
Other comprehensive income (loss), net of tax	1,048					1,048
Stock options exercised (in shares)		167,523
Stock options exercised	3,084	$ 1		3,083
Stock repurchased related to the exercise of stock options (in shares)		(137,194)
Stock repurchased related to the exercise of stock options	(4,210)	$ (1)		(4,209)
Stock awards vested (in shares)		101,721
Stock awards vested	0	$ 1		(1)
Stock-based compensation	3,495			3,495
Excess tax benefits or shortfall from share-based compensation	626			626
Ending Balance (in shares) at Dec. 31, 2015		11,084,318
Ending Balance at Dec. 31, 2015	185,734	$ 111	0	75,200	116,026	(5,603)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	25,261				25,261
Other comprehensive income (loss), net of tax	(476)					(476)
Stock options exercised (in shares)		132,325
Stock options exercised	2,122	$ 1		2,121
Stock repurchased related to the exercise of stock options (in shares)		(151,916)
Stock repurchased related to the exercise of stock options	(3,465)	$ (1)		(3,464)
Stock awards vested (in shares)		129,086
Stock awards vested	0	$ 1		(1)
Stock-based compensation	3,007			3,007
Excess tax benefits or shortfall from share-based compensation	(80)			(80)
Ending Balance (in shares) at Dec. 31, 2016		11,193,813
Ending Balance at Dec. 31, 2016	212,103	$ 112	0	76,783	141,287	(6,079)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	20,077				20,077
Other comprehensive income (loss), net of tax	$ (38)					(38)
Stock options exercised (in shares)	212,775	212,775
Stock options exercised	$ 4,336	$ 2		4,334
Stock repurchased related to the exercise of stock options (in shares)		(219,164)
Stock repurchased related to the exercise of stock options	(6,904)	$ (2)		(6,902)
Stock awards vested (in shares)		145,417
Stock awards vested	0	$ 1		(1)
Stock-based compensation	6,009			6,009
Ending Balance (in shares) at Dec. 31, 2017		11,332,841
Ending Balance at Dec. 31, 2017	$ 235,583	$ 113	$ 0	$ 80,223	$ 161,364	$ (6,117)

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash Flows from Operating Activities
Net Income	$ 20,077	$ 25,261	$ (74,879)
Adjustments to Reconcile Net Income (Loss) to Net Cash Provided by Operating Activities
Depreciation and amortization	22,845	22,860	26,846
Gain on divestitures, net	0	(17,604)	0
Goodwill impairment	0	0	57,243
Intangible asset impairment	0	0	32,937
Property and equipment impairment due to restructuring	3,607	0	0
Stock-based compensation expense	4,675	3,007	3,495
Deferred income taxes	(15,411)	3,519	(29,110)
Excess tax benefits from stock-based compensation	0	(248)	(626)
Provision for doubtful accounts	373	112	132
Noncash loss on extinguishment of debt	0	0	4,970
Other	(1,182)	(7,204)	5,628
Changes in Assets and Liabilities:
Accounts receivable	2,720	3,220	4,444
Inventories	(533)	(5,182)	20,985
Production cost of contracts	(267)	(1,536)	330
Other assets	40	2,974	5,884
Accounts payable	(4,015)	15,055	(13,978)
Accrued and other liabilities	2,505	(966)	(20,623)
Net Cash Provided by Operating Activities	35,434	43,268	23,678
Cash Flows from Investing Activities
Purchases of property and equipment	(27,610)	(17,001)	(15,891)
Proceeds from sale of assets	913	16	904
Insurance recoveries related to property and equipment	288	0	1,510
Proceeds from divestitures	0	51,893	0
Payments for purchase of Lightning Diversion Systems, LLC, net of cash acquired	(59,798)	0	0
Net Cash (Used in) Provided by Investing Activities	(86,207)	34,908	(13,477)
Cash Flows from Financing Activities
Borrowings from senior secured revolving credit facility	395,900	71,800	65,000
Repayment of senior secured revolving credit facility	(337,800)	(71,800)	(65,000)
Borrowings from term loan	0	0	275,000
Repayments of senior unsecured notes and term loans	(10,000)	(75,000)	(320,000)
Repayments of other debt	(3)	(23)	(26)
Debt issuance costs	0	0	(4,848)
Excess tax benefits from stock-based compensation	0	248	626
Net cash paid from issuance of common stock under stock plans	(2,606)	(1,423)	(1,126)
Net Cash Provided by (Used in) Financing Activities	45,491	(76,198)	(50,374)
Net (Decrease) Increase in Cash and Cash Equivalents	(5,282)	1,978	(40,173)
Cash and Cash Equivalents at Beginning of Year	7,432	5,454	45,627
Cash and Cash Equivalents at End of Year	$ 2,150	$ 7,432	$ 5,454

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2017

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, industrial, medical, and other industries. Our subsidiaries 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 aerospace and defense, industrial, medical, and other end-use markets. Electronic Systems’ product offerings primarily range from prototype development to complex assemblies. Structural Systems designs, engineers and manufactures large, complex contoured aerostructure components and assemblies and supplies composite and metal bonded structures and assemblies. Structural Systems’ products are primarily used on commercial aircraft, military fixed-wing aircraft and military and commercial rotary-wing aircraft. All reportable operating segments follow the same accounting principles.

Basis of Presentation

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

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

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

Use of Estimates

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

Reclassifications

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

Supplemental Cash Flow Information



	(In thousands) Years Ended December 31,
	2017		2016		2015
Interest paid	$	7,307	$	6,877	$	26,501
Taxes paid	$	3,125	$	9,778	$	1,150
Non-cash activities:
Purchases of property and equipment not paid	$	2,104	$	3,241	$	1,549

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. Level 2 refers to fair values estimated using significant observable inputs. Level 3, the lowest level, includes fair values estimated using significant unobservable inputs.. See Note 4 for further information.

Cash Equivalents

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

Derivative Instruments

We recognize derivative instruments on our consolidated balance sheets at their fair value. On the date that we enter into a derivative contract, we designate the derivative instrument as a fair value hedge, a cash flow hedge, a hedge of a net investment in a foreign operation, or a derivative instrument that will not be accounted for using hedge accounting methods. As of December 31, 2017 and December 31, 2016, 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 on the consolidated statements of cash flows in the same category as the item being hedged or on a basis consistent with the nature of the instrument.

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

Allowance for Doubtful Accounts

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

Inventories

Inventories are stated at the lower of cost or net realizable value with cost being determined using a moving average cost basis for raw materials and actual cost for work-in-process and finished goods, with units being relieved and charged to cost of sales on a first-in, first-out basis. 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. Costs under long-term contracts are accumulated into, and removed from, inventory on the same basis as other contracts. 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.

We net progress payments from customers related to inventory purchases against inventories in the consolidated balance sheets.

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 goods sold using the units of delivery method. We review long-lived assets within production costs of contracts for impairment on an annual basis (which we perform during the fourth quarter) or when events or changes in circumstances indicate that the carrying value of our long-lived assets may not be recoverable. An impairment charge is recognized when the carrying value of an asset exceeds the projected undiscounted future cash flows expected from its use and disposal. As of December 31, 2017 and 2016, production costs of contracts were $11.2 million and $11.3 million, respectively.

Property and Equipment and Depreciation

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

Goodwill and Indefinite-Lived Intangible Asset

Goodwill is evaluated for impairment on a annual basis on the first day of the fourth fiscal quarter or more frequently if events or changes in circumstances indicate that the asset may be impaired. Our impairment evaluation of goodwill consists of a qualitative assessment to determine if it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If our qualitative assessment indicates it is more likely than not that the estimated fair value of a reporting unit exceeds its carrying value, no further analysis is required and goodwill is not impaired. Otherwise, we will follow a two-step quantitative goodwill impairment test to determine if goodwill is impaired.

In the first step, we determine the fair value of the reporting unit using expected future discounted cash flows and market valuation approaches considering comparable Company revenue and Earnings Before Interest, Taxes, Depreciation and Amortization (“EBITDA”) multiples. If the carrying value of the reporting unit exceeds its fair value, we then perform the second step of the impairment test to measure the amount of the goodwill impairment loss, if any.

The second step requires fair valuation of all the reporting unit’s assets and liabilities in a manner similar to a purchase price allocation, with any residual fair value being allocated to goodwill. This residual fair value of goodwill is then compared to the carrying value of goodwill to determine impairment. An impairment charge will be recognized equal to the excess of the carrying value of goodwill over the implied fair value of goodwill.

In 2015, as a result of the annual goodwill impairment test, we recorded $57.2 million of goodwill impairment to the Structural Systems operating segment reducing the goodwill carrying value to zero as of December 31, 2015.

We review our indefinite-lived intangible asset for impairment on an annual basis or when events or changes in circumstances indicate that the carrying value of our intangible asset may not be recoverable. We may first assess qualitative factors to determine whether it is more likely than not that an indefinite-lived intangible asset is impaired as a basis for determining whether it is necessary to perform the quantitative impairment test. Impairment indicators include, but are not limited to, cost factors, financial performance, adverse legal or regulatory developments, industry and market conditions and general economic conditions. If the carrying amount of the indefinite-lived intangible asset exceeds its fair value, we would recognize an impairment loss in the amount of such excess. In performing our annual impairment test in the fourth quarter of 2015, we concluded the fair value of the indefinite-lived trade name to be zero as a result of divesting businesses in Electronic Systems and our discontinuation of the use of the trade name. Thus, we recorded a $32.9 million of trade name impairment to the Electronic Systems trade name carrying value to decrease its trade name carrying value to zero as of December 31, 2015.

Other Intangible Assets

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

Accumulated Other Comprehensive Loss

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

Revenue Recognition

Except as described below, we recognize revenue, including revenue from products sold under long-term contracts, when persuasive evidence of an arrangement exists, the price is fixed or determinable, collection is reasonably assured and delivery of products has occurred or services have been rendered.

We have a significant number of contracts for which we recognize revenue under the contract method of accounting and record revenues and cost of sales on each contract in accordance with the percentage-of-completion method of accounting, using the units-of-delivery method. Under the units-of-delivery method, revenue is recognized based upon the number of units delivered during a period and the costs are recognized based on the actual costs allocable to the delivered units. Costs allocable to undelivered units are reported on the balance sheet as inventory. This method is used in circumstances in which a company produces units of a basic product under production-type contracts in a continuous or sequential production process to buyers’ specifications. These contracts are primarily fixed-price contracts that vary widely in terms of size, length of performance period, and expected gross profit margins.

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 management 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. Management's estimate of the future cost to complete a contract may include assumptions as to improvements in manufacturing efficiency, reductions in 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 record additional provisions for estimated losses on contracts.

In 2015, we recorded a charge in Structural Systems related to estimated cost overruns as a result of a change in the contract requirements for the remaining contractual period for a regional jet program of $10.0 million. This amount was recorded as part of cost of goods sold in our results of operations and increased accrued liabilities by $7.6 million and other long-term liabilities by $2.4 million.

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 as a result of research and development (“R&D”) tax credits available in the United States and deductions available in the United States for domestic production activities. 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 valuation allowances against deferred tax assets, the recognition or derecognition of tax benefits related to uncertain tax positions, expected utilization of R&D tax credits and changes in or the interpretation of tax laws in jurisdictions where we conduct business.

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

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

On December 22, 2017, the Tax Cuts and Jobs Act (the “2017 Tax Act”) was enacted. The 2017 Tax Act represents major tax reform legislation that, among other provisions, reduces the U.S. corporate tax rate. Certain provisional amounts for the income tax effects of the 2017 Tax Act, including $13.0 million of deferred income tax benefit recorded principally due to the re-measurement of the federal portion of our deferred tax assets and liabilities, are reflected in our financial results in accordance with SEC Staff Accounting Bulletin No. 118 (“SAB 118”), which provides SEC staff guidance regarding the application of Accounting Standards Codification (“ASC”) Topic 740, “Income Taxes,” in the reporting period in which the 2017 Tax Act became law. See Note 16 for further information.

Litigation and Commitments

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

Environmental Liabilities

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

Accounting for Stock-Based Compensation

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

Earnings (Loss) 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 are computed by dividing income available to common shareholders plus income associated with dilutive securities by the weighted-average number of common shares outstanding, plus any potential dilutive shares that could be issued if exercised or converted into common stock in each period.

The net earnings (loss) and weighted-average number of common shares outstanding used to compute earnings (loss) per share were as follows:



	(In thousands, except per share data) Years Ended December 31,
	2017		2016		2015
Net income (loss)	$	20,077	$	25,261	$	(74,879	)
Weighted-average number of common shares outstanding
Basic weighted-average common shares outstanding	11,290		11,151		11,047
Dilutive potential common shares	268		148		—
Diluted weighted-average common shares outstanding	11,558		11,299		11,047
Earnings (loss) per share
Basic	$	1.78	$	2.27	$	(6.78	)
Diluted	$	1.74	$	2.24	$	(6.78	)

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



	(In thousands) Years Ended December 31,
	2017	2016	2015
Stock options and stock units	126	553	778

Recent Accounting Pronouncements

New Accounting Guidance Adopted in 2017

In December 2016, the FASB issued ASU 2016-19, “Technical Corrections and Improvements” (“2016-19”), which cover a variety of Topics in the Codification. The amendments in ASU 2016-19 represent changes to make corrections or improvements to the Codification that are not expected to have a significant effect on current accounting practice or create a significant administrative cost to most entities. The new guidance was effective for us beginning January 1, 2017. The adoption of this standard did not have a significant impact on our condensed consolidated financial statements.

In March 2016, the FASB issued ASU 2016-09, “Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting” (“ASU 2016-09”), which is intended to improve the accounting for employee share-based payments. The new guidance was effective for us beginning January 1, 2017. The adoption of this standard did not have a significant dollar impact on our condensed consolidated financial statements.

In March 2016, the FASB issued ASU 2016-05, “Derivatives and Hedging (Topic 815): Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships” (“ASU 2016-05”), which clarifies that a change in the counter party to a derivative instrument designated as a hedging instrument does not require dedesignation of that hedging relationship, provided that all other hedge accounting criteria are met. The new guidance was effective for us beginning January 1, 2017. The adoption of this standard did not have a significant impact on our condensed consolidated financial statements.

In July 2015, the FASB issued ASU 2015-11, “Inventory (Topic 330)” (“ASU 2015-11”), which requires inventory within the scope of ASU 2015-11 to be measured at the lower of cost or net realizable value. Subsequent measurement is unchanged for inventory measured using last-in, first-out (“LIFO”) or the retail inventory value. The new guidance was effective for us beginning January 1, 2017. The adoption of this standard did not have a significant impact on our condensed consolidated financial statements.

Recently Issued Accounting Standards

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 will be our interim period beginning January 1, 2019. Early adoption is permitted, including adoption in any interim period after the issuance of ASU 2017-12. We are evaluating the impact of this standard.

In May 2017, the FASB issued ASU 2017-09, “Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting” (“ASU 2017-09”), which provides clarity on determining which changes to the terms and conditions of share-based payment awards require an entity to apply modification accounting under Topic 718. The new guidance is effective for annual periods beginning after December 15, 2017, including interim periods within those annual periods, which will be our interim period beginning January 1, 2018. Early adoption is permitted, including adoption in any interim period. The amendments should be applied prospectively to an award modified on or after the adoption date. We are evaluating the impact of this standard.

In March 2017, the FASB issued ASU 2017-07, “Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Costs” (“ASU 2017-07”), which require an employer to report the service cost component in the same line item or items as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations, if one is presented. If a separate line item or items are used to present the other components of net benefit cost, that line item or items must be appropriately described. If a separate line item or items are not used, the line item or items used in the income statement to present the other components of net benefit cost must be disclosed. The amendments also allow only the service cost component to be eligible for capitalization when applicable. The new guidance is effective for annual periods beginning after December 15, 2017, including interim periods within those annual periods, which will be our interim period beginning January 1, 2018. We are evaluating the impact of this standard.

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. We are evaluating the impact of this standard.

In January 2017, the FASB issued ASU 2017-01, “Business Combinations (Topic 805): Clarifying the Definition of a Business” (“ASU 2017-01”), which clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of businesses. The new guidance is effective for annual periods beginning after December 15, 2017, including interim periods within those annual periods, which will be our interim period beginning January 1, 2018. We are evaluating the impact of this standard.

In August 2016, the FASB issued ASU 2016-15, “Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments” (“ASU 2016-15”), which addresses the following eight specific cash flow issues: Debt prepayment or debt extinguishment costs; settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing; contingent consideration payments made after a business combination; proceeds from the settlement of insurance claims; proceeds from the settlement of corporate-owned life insurance policies (“COLIs”) (including bank-owned life insurance policies [“BOLIs”]); distributions received from equity method investees; beneficial interests in securitization transactions; and separately identifiable cash flows and application of the predominance principle. The new guidance is effective for annual periods beginning after December 15, 2017, including interim periods within those annual periods, which will be our interim period beginning January 1, 2018. We are evaluating the impact of this standard.

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. The new guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, which will be our interim period beginning January 1, 2019. We are evaluating the impact of this standard and currently anticipate it will impact our condensed consolidated financial statements.

In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606)” (“ASU 2014-09”), which outlines a new, single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. This new revenue recognition model provides a five-step analysis in determining when and how revenue is recognized. It depicts the transfer of promised goods or services to customers in an amount that reflects the consideration an entity expects to receive in exchange for those goods or services. Companies have the option of applying the provisions of ASU 2014-09 either retrospectively to each prior reporting period presented or retrospectively with the cumulative effect of initially applying this guidance recognized at the date of initial application. Additional guidance was issued subsequently as follows:


•	December 2016, the FASB issued ASU 2016-20, “Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers” (“ASU 2016-20”);


•	May 2016, the FASB issued ASU 2016-12, “Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients” (“ASU 2016-12”);


•	May 2016, the FASB issued ASU 2016-11, “Revenue Recognition (Topic 605) and Derivatives and Hedging (Topic 815): Rescission of SEC Guidance Because of Accounting Standards Updates 2014-09 and 2014-06 Pursuant to Staff Announcements at the March 3, 2016 EITF Meeting” (“ASU 2016-11”);


•	April 2016, the FASB issued ASU 2016-10, “Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing” (“ASU 2016-10”); and


•	August 2015, the FASB issued ASU 2015-14, “Revenue From Contracts With Customers (Topic 606)” (“ASU 2015-14”).

All of this new guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years, which will be our interim period beginning January 1, 2018.

We are in the process of completing the implementation phase of the project. We have noted that under ASU 2014-09, the percentage of completion, unit of delivery method of recognizing revenue will no longer be an acceptable method for us and production costs will generally not be deferred. Instead, revenue will be recognized as the customer obtains control of the goods and services promised in the contract (i.e., performance obligations). Given the nature of our products and terms and conditions in the majority of our contracts, our customer obtains control as we perform work under the contract. As such, the majority of our revenues will be recognized sooner as a result of changing to an over time method (i.e., cost-to-cost plus margin) from a point-in-time method, which is our current method for recognizing revenue. This will result in eliminating the majority of our work-in-process and finished goods inventory and a significant increase in unbilled accounts receivables (i.e., contract assets). This change will also impact our information technology systems, systems of internal controls over financial reporting, and certain accounting policies, requiring the usage of more judgment in determining our revenue recognition. We have selected a software solution and are in the process of implementing the software solution to comply with this new accounting standard. The new accounting standard will be adopted using the modified retrospective method, whereby 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 2018. We have periodically briefed our Audit Committee of the Board of Directors on the progress made towards the adoption of this revenue recognition accounting standard. Since we have not completed the implementation of the software solution, we currently are unable to determine the exact impact to our consolidated financial statements. However, we expect the impact to be significant on certain captions on our January 1, 2018 opening balance sheet.

Business Combination

12 Months Ended

Dec. 31, 2017

Business Combinations [Abstract]

Business Combination

On September 11, 2017, we acquired 100.0% of the outstanding equity interests of Lightning Diversion Systems, LLC (“LDS”), a privately-held, worldwide leader in lightning protection systems serving the aerospace and defense industries, located in Huntington Beach, California. The acquisition of LDS is part of our strategy to enhance revenue growth by focusing on advanced proprietary technology on various aerospace and defense platforms.

The purchase price for LDS was $60.0 million, net of cash acquired, all payable in cash. Upon the closing of the transaction, we paid $61.4 million with the remaining $0.6 million paid in October 2017. We allocated the gross purchase price of $62.0 million to the assets acquired and liabilities assumed at estimated fair values. The excess of the purchase price over the aggregate fair values was recorded as goodwill.

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



	Estimated Fair Value
Cash	$	2,223
Accounts receivable	918
Inventories	1,732
Other current assets	54
Property and equipment	138
Intangible assets	22,400
Goodwill	34,881
Total assets acquired	62,346
Current liabilities	(325		)
Total liabilities assumed	(325		)
Total purchase price allocation	$	62,021



	Useful Life (In years)	Estimated Fair Value (In thousands)
Intangible assets:
Customer relationships	15	$	21,100
Trade name	15	1,300
		$	22,400

The intangible assets acquired of $22.4 million were determined based on the estimated fair values using valuation techniques consistent with the income approach to measure fair value. The useful lives were estimated based on the underlying agreements or the future economic benefit expected to be received from the assets. The fair values of the identifiable intangible assets were estimated using several valuation methodologies, which represented Level 3 fair value measurements. The value for customer relationships was estimated based on a multi-period excess earnings approach, while the value for the trade name was assessed using the relief from royalty methodology. Further, we analyzed the technology acquired and concluded no fair value should be assigned to it.

The goodwill of $34.9 million arising from the acquisition is attributable to the benefits we expect to derive from expected synergies from the transaction, including complementary products that will enhance our overall product portfolio, opportunities within new markets, and an acquired assembled workforce. All the goodwill was assigned to the Electronic Systems segment. Since the LDS acquisition, for tax purposes, was deemed an asset acquisition, the goodwill recognized is deductible for income tax purposes.

Acquisition related transaction costs are not included as components of consideration transferred but have been expensed as incurred. Total acquisition-related transaction costs incurred by us were $0.3 million during 2017 and charged to selling, general and administrative expenses.

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

Restructuring Activities

12 Months Ended

Dec. 31, 2017

Restructuring and Related Activities [Abstract]

Restructuring Activities

Summary of 2017 Restructuring Plan

In November 2017, management approved and commenced a restructuring plan that is expected to increase operating efficiencies. We currently estimate this initiative will result in $19.0 million to $22.0 million in total pre-tax restructuring charges through 2018, with $8.8 million recorded during 2017. We are currently evaluating a number of possible scenarios to execute the second phase of the restructuring plan, which will result in additional restructuring charges during 2018. We anticipate the additional charges will include cash payments for employee separation and non-cash charges for asset impairments, depending on the specific plan we develop. On an annualized basis, beginning in 2019, we estimate these restructuring actions will result in total savings of $14.0 million.

In the Electronic Systems segment, we have recorded expenses of $1.2 million for severance and benefits which was charged to restructuring charges.

In the Structural Systems segment, we have recorded expenses of $1.7 million for severance and benefits which was charged to restructuring charges. In addition, we recorded non-cash expenses of $3.6 million for property and equipment impairment which was charged to restructuring charges. Further, we recorded non-cash expenses of $0.5 million for inventory write down which was charged to cost of sales.

In Corporate, we have recorded expenses of $0.4 million for severance and benefits and non-cash expenses of $1.4 million for stock-based compensation awards which were modified, all of which was charged to restructuring charges.

As of December 31, 2017, we have accrued $1.0 million, $1.3 million, and $0.4 million for severance and benefits and loss on early exit from lease in the Electronic Systems segment, Structural Systems segment, and Corporate, respectively.

Summary of 2016 Restructuring Plan

In May 2016, management approved and commenced implementation of the closure of one of our Tulsa facilities that was completed in June 2016, and is part of our overall strategy to streamline operations. We have recorded cumulative expenses of $0.2 million for severance and benefits and loss on early exit from a lease, all of which were charged to restructuring charges in 2016. We do not expect to record additional expenses related to this restructuring plan.

As of December 31, 2017, we have accrued less than $0.1 million for loss on early exit from lease in the Electronic Systems segment.

Summary of 2015 Restructuring Plans

In September 2015, management approved and commenced implementation of several restructuring actions, including organizational re-alignment, consolidation and relocation of the New York facilities that was completed in December 2015, closure of the Houston facility that was completed in December 2015, and closure of the St. Louis facility that was completed in April 2016, all of which are part of our overall strategy to streamline operations. We have recorded cumulative expenses of $2.2 million for severance and benefits and loss on early exit from leases, all of which were charged to restructuring charges in 2015. We do not expect to record additional expenses related to these restructuring plans.

As of December 31, 2017, all payments have been made on early exit from lease in the Structural Systems segment.

Our restructuring activities for 2017 and 2016 were as follows (in thousands):



	December 31, 2016		2017										December 31, 2017
	Balance		Charges		Cash Payments			Non-Cash Payments			Change in Estimates		Balance
Severance and benefits	$	—	$	3,337	$	(678	)	$	—		$	—	$	2,659
Modification of stock-based compensation awards	—		1,334		—			(1,334		)	—		—
Lease termination	654		18		(670		)	—			64		66
Property and equipment impairment due to restructuring	—		3,607		—			(3,607		)	—		—
Inventory write down	—		478		—			(478		)	—		—
Ending balance	$	654	$	8,774	$	(1,348	)	$	(5,419	)	$	64	$	2,725

Fair Value Measurements

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair value is defined as the price that would be received for an asset or the price that would be paid to transfer a liability (an exit price) in the principal or most advantageous market in an orderly transaction between market participants on the measurement date. The accounting standard provides a framework for measuring fair value using a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. This hierarchy requires us to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. Three levels of inputs that may be used to measure fair value are as follows:

Level 1 - Quoted prices (unadjusted) in active markets for identical assets or liabilities;

Level 2 - Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and

Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

Our financial instruments consist primarily of cash and cash equivalents and interest rate cap derivatives designated as cash flow hedging instruments. Assets and liabilities measured at fair value on a recurring basis were as follows (in thousands):



	As of December 31, 2017								As of December 31, 2016
	Fair Value Measurements Using								Fair Value Measurements Using
	Level 1		Level 2		Level 3		Total Balance		Level 1		Level 2		Level 3		Total Balance
Assets
Money market funds⁽¹⁾	$	26	$	—	$	—	$	26	$	3,751	$	—	$	—	$	3,751
Interest rate cap hedges⁽²⁾	—		165		—		165		—		553		—		553
Total Assets	$	26	$	165	$	—	$	191	$	3,751	$	553	$	—	$	4,304

(1) Included as cash and cash equivalents.

(2) Interest rate cap hedge premium included as other current assets and other assets.

The fair value of the interest rate cap hedge agreements is determined using pricing models that use observable market inputs as of the balance sheet date, a Level 2 measurement.

There were no transfers between Level 1, Level 2, or Level 3 financial instruments in either 2017 or 2016.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Financial Instruments

12 Months Ended

Dec. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Financial Instruments

Derivative Instruments and Hedging Activities

We periodically enter into cash flow derivative transactions, such as interest rate cap agreements, to hedge exposure to various risks related to interest rates. We assess the effectiveness of the interest rate cap hedges at inception of the hedge. We recognize all derivatives at their fair value. For cash flow designated hedges, the effective portion of the changes in fair value of the derivative contract are recorded in accumulated other comprehensive income (loss), net of taxes, and are recognized in net earnings at the time earnings are affected by the hedged transaction. Adjustments to record changes in fair values of the derivative contracts that are attributable to the ineffective portion of the hedges, if any, are recognized in earnings. We present derivative instruments in our consolidated statements of cash flows’ operating, investing, or financing activities consistent with the cash flows of the hedged item.

Our interest rate cap hedges were designated as cash flow hedges and deemed highly effective at the inception of the hedges. These interest rate cap hedges mature concurrently with the term loan in June 2020. In 2017, the interest rate cap hedges continued to be highly effective and $0.2 million, net of tax, was recognized in other comprehensive income. No amount was recorded in the consolidated statements of operations in 2017. See Note 10.

The recorded fair value of the derivative financial instruments in the consolidated balance sheets were as follows:



	(In thousands) December 31, 2017				(In thousands) December 31, 2016
	Other Current Assets		Other Long Term Assets		Other Current Assets		Other Long Term Assets
Derivatives Designated as Hedging Instruments
Cash Flow Hedges:
Interest rate cap premiums	$	—	$	165	$	—	$	553

Total Derivatives	$	—	$	165	$	—	$	553

Property and Equipment, Net

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property and Equipment, Net

Property and equipment, net consisted of the following:



	(In thousands) December 31,				Range of Estimated
	2017		2016		Useful Lives
Land	$	15,662	$	15,662
Buildings and improvements	57,024		49,870		5 - 40 Years
Machinery and equipment	146,175		137,555		2 - 20 Years
Furniture and equipment	21,127		21,749		2 - 10 Years
Construction in progress	13,480		12,238
	253,468		237,074
Less accumulated depreciation	143,216		135,484
Total	$	110,252	$	101,590

Depreciation expense was $13.2 million, $13.3 million and $15.7 million, for the years ended December 31, 2017, 2016 and 2015, respectively.

Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

Goodwill

The carrying amounts of goodwill, all in our Electronic Systems segment, for the years ended December 31, 2017 and 2016 were as follows:



	(In thousands)
Gross goodwill	$	164,276
Accumulated goodwill impairment	(81,722		)
Balance at December 31, 2016	82,554
Goodwill from acquisition during the period	34,881
Balance at December 31, 2017	$	117,435

Goodwill is evaluated for impairment on a annual basis on the first day of the fourth fiscal quarter or more frequently if events or changes in circumstances indicate that the asset may be impaired. Our impairment evaluation of goodwill consists of a qualitative assessment to determine if it is more likely than not that the fair value of a reporting unit is less than its carrying amount. The qualitative evaluation is an assessment of factors, including reporting unit specific operating results as well as industry, market, and economic conditions, to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount, including goodwill. If our qualitative assessment indicates it is more likely than not that the estimated fair value of a reporting unit exceeds its carrying value, no further analysis is required and goodwill is not impaired. Otherwise, we will follow a two-step quantitative goodwill impairment test to determine if goodwill is impaired.

In the fourth quarter of 2017, the carrying amount of goodwill at the date of the most recent annual impairment evaluation was $117.4 million, all of which was in our Electronic Systems operating segment. As of the date of our 2017 annual evaluation for goodwill impairment, we used a qualitative assessment noting it was not more likely than not that the fair value of a reporting unit is less than its carrying amount and thus, goodwill was not deemed impaired. Our most recent step-one goodwill impairment analysis was in the prior year fourth quarter of 2016 and the fair value of the Electronic Systems internal reporting unit exceeded its carrying value at that time by 32% and thus, was not deemed impaired.

In September 2017, we acquired 100.0% of the outstanding equity interests of LDS for a purchase price of $60.0 million, net of cash acquired. We allocated the gross purchase price of $62.0 million to the assets acquired and liabilities assumed at estimated fair values. The excess of the purchase over the aggregate fair values was recorded as goodwill. See Note 2.

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



		(In thousands)
		December 31, 2017						December 31, 2016
	Wtd. Avg Life (Yrs)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Finite-lived assets
Customer relationships	17	$	180,300	$	67,449	$	112,851	$	159,200	$	58,352	$	100,848
Trade names	15	1,300		26		1,274		—		—		—
Contract renewal	14	1,845		1,493		352		1,845		1,362		483
Technology	15	400		184		216		400		158		242
Total		$	183,845	$	69,152	$	114,693	$	161,445	$	59,872	$	101,573

The carrying amount of other intangible assets by operating segment as of December 31, 2017 and 2016 was as follows:



	(In thousands)
	December 31, 2017						December 31, 2016
	Gross		Accumulated Amortization		Net Carrying Value		Gross		Accumulated Amortization		Net Carrying Value
Other intangible assets
Structural Systems	$	19,300	$	16,464	$	2,836	$	19,300	$	15,555	$	3,745
Electronic Systems	164,545		52,688		111,857		142,145		44,317		97,828
Total	$	183,845	$	69,152	$	114,693	$	161,445	$	59,872	$	101,573

Amortization expense of other intangible assets was $9.3 million, $9.0 million and $10.0 million for the years ended December 31, 2017, 2016 and 2015, respectively. Future amortization expense by operating segment is expected to be as follows:



	(In thousands)
	Structural Systems		Electronic Systems		Consolidated Ducommun
2018	$	737	$	9,420	$	10,157
2019	591		9,419		10,010
2020	490		9,348		9,838
2021	381		9,287		9,668
2022	320		9,288		9,608
Thereafter	317		65,095		65,412
	$	2,836	$	111,857	$	114,693

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Long-Term Debt

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Long-Term Debt

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



	(In thousands) December 31,
	2017			2016
Term loan	$	160,000		$	170,000
Revolving credit facility	58,100			—
Other debt (fixed 5.41%)	—			3
Total debt	218,100			170,003
Less current portion	—			3
Total long-term debt	218,100			170,000
Less debt issuance costs	2,045			3,104
Total long-term debt, net of debt issuance costs	$	216,055		$	166,896
Weighted-average interest rate	3.73		%	3.25		%

Future long-term debt payments at December 31, 2017 were as follows:



	(In thousands)
2018	$	—
2019	—
2020	218,100
2021	—
2022	—
Total	$	218,100

Our credit facility consists of a $275.0 million senior secured term loan, which matures on June 26, 2020 (“Term Loan”), and a $200.0 million senior secured revolving credit facility (“Revolving Credit Facility”), which matures on June 26, 2020 (collectively, the “Credit Facilities”). The Credit Facilities bear interest, at our option, at a rate equal to either (i) the Eurodollar Rate (defined as LIBOR) plus an applicable margin ranging from 1.50% to 2.75% 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 0.50% to 1.75% per year, in each case based upon the consolidated total net adjusted leverage ratio. The undrawn portions of the commitments of the Credit Facilities are subject to a commitment fee ranging from 0.175% to 0.300%, based upon the consolidated total net adjusted leverage ratio.

Further, we are required to make mandatory prepayments of amounts outstanding under the Term Loan. The mandatory prepayments will be made quarterly, equal to 5.0% per year of the original aggregate principal amount during the first two years and increase to 7.5% per year during the third year, and increase to 10.0% per year during the fourth year and fifth years, with the remaining balance payable on June 26, 2020. The loans under the Revolving Credit Facility are due on June 26, 2020. As of December 31, 2017, we were in compliance with all covenants required under the Credit Facilities.

In addition, we incurred $4.8 million of debt issuance costs related to the Credit Facilities and those costs were capitalized and are being amortized over the five year life of the Credit Facilities.

In September 2017, we acquired LDS for a purchase price of $60.0 million, net of cash acquired, all payable in cash. Upon the closing of the transaction, we paid $61.4 million in cash by drawing down on the Revolving Credit Facility. The remaining $0.6 million was paid in October 2017 in cash, also by drawing down on the Revolving Credit Facility. See Note 2.

In July 2017, we entered into a technical amendment to the Credit Facilities (“First Amendment”) which provided more flexibility to close certain qualified acquisitions permitted under the Credit Facilities.

We made voluntary principal prepayments of $10.0 million under the Term Loan during 2017.

As of December 31, 2017, we had $141.6 million of unused borrowing capacity under the Revolving Credit Facility, after deducting $58.1 million for draw down on the Revolving Credit Facility and $0.3 million for standby letters of credit.

The Existing Notes were issued by us (“Parent Company”) and guaranteed by all of our subsidiaries, other than one subsidiary that was considered minor (“Subsidiary Guarantors”). The Subsidiary Guarantors jointly and severally guarantee the Existing Notes and 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 maturity dates of June 2020, and in aggregate, totaling $135.0 million of our debt. We paid a total of $1.0 million in connection with the interest rate cap hedges. See Note 5 for further information.

In December 2017 and 2016, we entered into agreements to purchase $14.2 million and $9.9 million of industrial revenue bonds (“IRBs”) issued by the city of Parsons, Kansas (“Parsons”) and concurrently, sold $14.2 million and $9.9 million of property and equipment (“Property”) to Parsons as well as entered into a lease agreement to lease the Property from Parsons (“Lease”) with lease payments totaling $14.2 million and $9.9 million over the lease term, respectively. The sale of the Property and concurrent lease back of the Property in December 2017 and 2016 did not meet the sale-leaseback accounting requirements as a result of our continuous involvement with the Property and thus, the $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 Lease included a right of offset so long as we continue to own the IRBs and thus, the financing obligation of $14.2 million and $9.9 million was offset against the $14.2 million and $9.9 million, respectively, of IRBs assets and are presented net on the consolidated balance sheets with no impact to the consolidated statements of operations or consolidated cash flow statements.

Stock-Based Compensation

12 Months Ended

Dec. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation

Stock Incentive Compensation Plans

We have two stock incentive plans: the 2007 Stock Incentive Plan (the “2007 Plan”), as amended effective March 20, 2007, and the 2013 Stock Incentive Plan (the “2013 Plan”), collectively referred to as (the “Stock Incentive Plans”). The Stock Incentive Plans permit awards of stock options, restricted stock units, performance stock units and other stock-based awards to our officers, key employees and non-employee directors on terms determined by the Compensation Committee of the Board of Directors (the “Committee”). The aggregate number of shares available for issuance under the 2007 Plan and 2013 Plan is 1,200,000 and 1,040,000, respectively. Under the 2007 Plan, no more than an aggregate of 400,000 shares are available for issue of stock-based awards other than stock options and stock appreciation rights. As of December 31, 2017, shares available for future grant under the 2007 Plan and 2013 Plan are zero and 77,693, respectively. Prior the adoption of the 2007 Plan, we granted stock-based awards to purchase shares of our common stock to officers, key employees and non-employee directors under certain predecessor plans. No further awards can be granted under the 2007 Plan or these predecessor plans.

Stock Options

In the years ended December 31, 2017, 2016, and 2015, we granted stock options to our officers, key employees and non-employee directors of 129,400, 123,500, and 73,000, respectively, with weighted-average grant date fair values of $11.88, $6.53, and $10.63, respectively. Stock options have been granted with an exercise price equal to the fair market value of our stock on the date of grant and expire not more than seven years from the date of grant. The stock options typically vest over a period of four years from the date of grant. The option price and number of shares are subject to adjustment under certain dilutive circumstances. If an employee terminates employment, the non-vested portion of the stock options will not vest and all rights to the non-vested portion will terminate completely.

Stock option activity for the year ended December 31, 2017 were as follows:



	Number of Stock Options		Weighted- Average Exercise Price Per Share		Weighted-Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2017	439,550		$	20.07
Granted	129,400		$	29.19
Exercised	(212,775	)	$	20.38
Expired	(5,800	)	$	21.12
Forfeited	(44,150	)	$	22.19
Outstanding at December 31, 2017	306,225		$	23.38	5.2	$	1,654
Exerciseable at December 31, 2017	86,425		$	20.78	2.9	$	663

Changes in nonvested stock options for the year ended December 31, 2017 were as follows:



	Number of Stock Options		Weighted- Average Grant Date Fair Value
Nonvested at January 1, 2017	225,175		$	8.77
Granted	129,400		$	11.88
Vested	(90,625	)	$	8.87
Forfeited	(44,150	)	$	7.93
Nonvested at December 31, 2017	219,800		$	11.07

The aggregate intrinsic value of stock options represents the amount by which the market price of our common stock exceeds the exercise price of the stock option. The aggregate intrinsic value of stock options exercised for the years ended December 31, 2017, 2016 and 2015 was $2.5 million, $1.3 million, and $2.3 million, respectively. Cash received from stock options exercised for the years ended December 31, 2017, 2016 and 2015 was $4.3 million, $2.1 million, and $3.1 million, respectively, with related tax benefits of $0.9 million, $0.5 million, and $0.9 million, respectively. The total amount of stock options vested and expected to vest in the future is 306,225 shares with a weighted-average exercise price of $23.38 and an aggregate intrinsic value of $1.7 million. These stock options have a weighted-average remaining contractual term of 5.2 years.

The share-based compensation cost expensed for stock options for the years ended December 31, 2017, 2016, and 2015 (before tax benefits) was $0.7 million, $0.8 million, and $1.2 million, respectively, and is included in selling, general and administrative expenses on the consolidated income statements. At December 31, 2017, total unrecognized compensation cost (before tax benefits) related to stock options of $1.5 million is expected to be recognized over a weighted-average period of 3.1 years. The total fair value of stock options vested during the years ended December 31, 2017, 2016, and 2015 was $0.8 million, $0.9 million, and $1.3 million, respectively.

We apply fair value accounting for stock-based compensation based on the grant date fair value estimated using a Black-Scholes-Merton (“Black-Scholes”) valuation model. The assumptions used to compute the fair value of stock option grants under the Stock Incentive Plans for years ended December 31, 2017, 2016, and 2015 were as follows:



	Years Ended December 31,
	2017		2016		2015
Risk-free interest rate	1.75	%	1.20	%	1.13	%
Expected volatility	50.37	%	51.79	%	53.72	%
Expected dividends	—		—		—
Expected term (in months)	48		48		47

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

Restricted Stock Units

We granted restricted stock units (“RSUs”) to certain officers, key employees and non-employee directors of 135,350, 139,450, and 108,500 RSUs during the years ended December 31, 2017, 2016, and 2015, respectively, with weighted-average grant date fair values (equal to the fair market value of our stock on the date of grant) of $28.97, $15.97, and $25.15 per share, respectively. RSUs represent a right to receive a share of stock at future vesting dates with no cash payment required from the holder. The RSUs typically have a three year vesting term of 33%, 33% and 34% on the first, second and third anniversaries of the date of grant, respectively. If an employee terminates employment, their non-vested portion of the RSUs will not vest and all rights to the non-vested portion will terminate.

Restricted stock unit activity for the year ended December 31, 2017 was as follows:



	Number of Restricted Stock Units		Weighted- Average Grant Date Fair Value
Outstanding at January 1, 2017	193,382		$	18.88
Granted	135,350		$	28.97
Vested	(101,930	)	$	19.66
Forfeited	(41,458	)	$	21.93
Outstanding at December 31, 2017	185,344		$	25.14

The share-based compensation cost expensed for RSUs for the years ended December 31, 2017, 2016, and 2015 (before tax benefits) was $2.0 million, $1.8 million, and $1.8 million respectively, and is included in selling, general and administrative expenses on the consolidated income statements. At December 31, 2017, total unrecognized compensation cost (before tax benefits) related to RSUs of $3.0 million is expected to be recognized over a weighted average period of 2.0 years. The total fair value of RSUs vested for the years ended December 31, 2017, 2016, and 2015 was $3.0 million, $1.3 million, and $1.8 million, respectively. The tax benefit realized from vested RSUs for the years ended December 31, 2017, 2016, and 2015 was $1.1 million, $0.7 million, and $0.7 million, respectively.

Performance Stock Units

We granted performance stock awards (“PSUs”) to certain key employees of 126,000, 62,500, and 64,000 PSUs during the years ended December 31, 2017, 2016, and 2015, respectively, with weighted-average grant date fair values of $26.31, $15.92, and $25.51 per share, respectively. PSU awards are subject to the attainment of performance goals established by the Committee, the periods during which performance is to be measured, and all other limitations and conditions applicable to the awarded shares. Performance goals are based on a pre-established objective formula that specifies the manner of determining the number of performance stock awards that will be granted if performance goals are attained. If an employee terminates employment, their non-vested portion of the PSUs will not vest and all rights to the non-vested portion will terminate.

Performance stock activity for the year ended December 31, 2017 was as follows:



	Number of Performance Stock Units		Weighted- Average Grant Date Fair Value
Outstanding at January 1, 2017	121,637		$	20.39
Granted	126,000		$	26.31
Adjustment for target performance	37,350		$	25.48
Vested	(43,487	)	$	24.98
Forfeited	(20,000	)	$	22.63
Outstanding at December 31, 2017	221,500		$	23.52

The share-based compensation cost expensed for PSUs for the years ended December 31, 2017, 2016, and 2015 (before tax benefits) was $2.0 million, $0.4 million and $0.5 million, respectively, and is included in selling, general and administrative expenses on the consolidated income statements. At December 31, 2017, total unrecognized compensation cost (before tax benefits) related to PSUs of $2.4 million is expected to be recognized over a weighted-average period of 1.7 years. The total fair value of PSUs vested during the years ended December 31, 2017, 2016, and 2015, was $1.2 million, $1.1 million, and $0.9 million, respectively. The tax benefit realized from PSUs for the years ended December 31, 2017, 2016, and 2015 were $0.5 million, $0.2 million, and $0.3 million, respectively.

Employee Benefit Plans

12 Months Ended

Dec. 31, 2017

Retirement Benefits [Abstract]

Employee Benefit Plans

Supplemental Retirement Plans

We have three unfunded supplemental retirement plans. The first plan was suspended in 1986, but continues to cover certain former executives. The second plan was suspended in 1997, but continues to cover certain current and retired directors. The third plan covers certain current and retired employees and further employee contributions to this plan were suspended on August 5, 2011. The liability for the third plan and interest thereon is included in accrued employee compensation and long-term liabilities and was $0.1 million and $0.7 million, respectively, at December 31, 2017 and $0.6 million and $0.8 million, respectively, at December 31, 2016. The accumulated benefit obligations of the first two plans at December 31, 2017 and December 31, 2016 were $0.6 million and $0.7 million, respectively, and are included in accrued liabilities.

Defined Contribution 401(K) Plans

We sponsor a 401(k) defined contribution plan for all our employees. The plan allows the employees to make annual voluntary contributions not to exceed the lesser of an amount equal to 25% of their compensation or limits established by the Internal Revenue Code. Under this plan, we generally provide a match equal to 50% of the employee’s contributions up to the first 6% of compensation, except for union employees who are not eligible to receive the match. Our provision for matching and profit sharing contributions for the three years ended December 31, 2017, 2016, and 2015 was $2.7 million, $2.7 million, and $3.2 million, respectively.

Other Plans

We have a defined benefit pension plan covering certain hourly employees of a subsidiary (the “Pension Plan”). Pension Plan benefits are generally determined on the basis of the retiree’s age and length of service. Assets of the Pension Plan are composed primarily of fixed income and equity securities. We also have a retirement plan covering certain current and retired employees (the “LaBarge Retirement Plan”).

The components of net periodic pension cost for both plans are as follows:



	(In thousands) Years Ended December 31,
	2017			2016			2015
Service cost	$	531		$	531		$	785
Interest cost	1,329			1,367			1,350
Expected return on plan assets	(1,530		)	(1,482		)	(1,495		)
Amortization of actuarial losses	810			762			887
Net periodic pension cost	$	1,140		$	1,178		$	1,527

The components of the reclassifications of net actuarial losses from accumulated other comprehensive loss to net income for 2017 were as follows:



	(In thousands) Year Ended December 31,
	2017
Amortization of actuarial loss - total before tax ⁽¹⁾	$	810
Tax benefit	(302		)
Net of tax	$	508


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

The estimated net actuarial loss for both plans that will be amortized from accumulated other comprehensive loss into net periodic cost during 2018 is $0.7 million.

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



	(In thousands) December 31,
	2017			2016
Change in benefit obligation⁽¹⁾
Beginning benefit obligation (January 1)	$	33,154		$	31,510
Service cost	531			531
Interest cost	1,329			1,367
Actuarial loss	2,449			1,132
Benefits paid	(1,461		)	(1,386		)
Ending benefit obligation (December 31)	$	36,002		$	33,154
Change in plan assets
Beginning fair value of plan assets (January 1)	$	22,015		$	19,933
Return on assets	3,481			1,551
Employer contribution	1,611			1,917
Benefits paid	(1,461		)	(1,386		)
Ending fair value of plan assets (December 31)	$	25,646		$	22,015
Funded status (underfunded)	$	(10,356	)	$	(11,139	)
Amounts recognized in the consolidated balance sheet
Current liabilities	$	560		$	544
Non-current liabilities	$	9,796		$	10,595
Unrecognized loss included in accumulated other comprehensive loss
Beginning unrecognized loss, before tax (January 1)	$	9,220		$	8,919
Amortization	(810		)	(762		)
Liability loss	2,449			1,132
Asset gain	(1,951		)	(69		)
Ending unrecognized loss, before tax (December 31)	8,908			9,220
Tax impact	(3,309		)	(3,425		)
Unrecognized loss included in accumulated other comprehensive loss, net of tax	$	5,599		$	5,795


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

On December 31, 2017, our annual measurement date, the accumulated benefit obligation exceeded the fair value of the plans assets by $10.4 million. Such excess is referred to as an unfunded accumulated benefit obligation. We recorded unrecognized loss included in accumulated other comprehensive loss, net of tax at December 31, 2017 and 2016 of $5.6 million and $5.8 million, respectively, which decreased shareholders’ equity. This charge to shareholders’ equity represents a net loss not yet recognized as pension expense. This charge did not affect reported earnings, and would be decreased or be eliminated if either interest rates increase or market performance and plan returns improve which will cause the Pension Plan to return to fully funded status.

Our Pension Plan asset allocations at December 31, 2017 and 2016, by asset category, were as follows:



	December 31,
	2017		2016
Equity securities	70	%	65	%
Cash and equivalents	1	%	2	%
Debt securities	29	%	33	%
Total⁽¹⁾	100	%	100	%


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



Cash	0-5%
Fixed income securities	15-75%
Equities	30-80%

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



	(In thousands) Year Ended December 31, 2017
	Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	135	$	—	$	—	$	135
Fixed income securities	3,494		—		—		3,494
Equities⁽¹⁾	1,625		—		—		1,625
Other investments	910		—		—		910
Total plan assets at fair value	$	6,164	$	—	$	—	6,164
Pooled funds							19,482
Total fair value of plan assets							$	25,646



	(In thousands) Year Ended December 31, 2016
	Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	366	$	—	$	—	$	366
Fixed income securities	3,468		—		—		3,468
Equities⁽¹⁾	1,611		—		—		1,611
Other investments	760		—		—		760
Total plan assets at fair value	$	6,205	$	—	$	—	6,205
Pooled funds							15,810
Total fair value of plan assets							$	22,015


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

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

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

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



	Years Ended December 31,
	2017		2016		2015
Discount rate used to determine pension expense
Pension Plan	4.18	%	4.55	%	4.25	%
LaBarge Retirement Plan	3.75	%	4.00	%	3.70	%

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



	December 31,
	2017		2016		2015
Discount rate used to determine value of obligations
Pension Plan	3.64	%	4.18	%	4.55	%
LaBarge Retirement Plan	3.40	%	3.75	%	4.00	%
Long-term rate of return - Pension Plan only	7.00	%	7.50	%	7.50	%

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



	(In thousands)
	Pension Plan		LaBarge Retirement Plan
2018	$	1,178	$	561
2019	1,212		546
2020	1,288		528
2021	1,365		506
2022	1,453		482
2023 - 2027	8,246		2,022

Our funding policy is to contribute cash to our plans so that the minimum contribution requirements established by government funding and taxing authorities are met. We expect to make contributions of $0.9 million to the plans in 2018.

Indemnifications	12 Months Ended
Indemnifications	Dec. 31, 2017
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 the facility or the lease. We indemnify our directors and officers to the maximum extent permitted under the laws of the State of Delaware. However, we have a directors and officers insurance policy that may reduce our exposure in certain circumstances and may enable us to recover a portion of future amounts that may be payable, if any. The duration of the guarantees and indemnities varies and, in many cases is indefinite but subject to statute of limitations. The majority of guarantees and indemnities do not provide any limitations of the maximum potential future payments we could be obligated to make. Historically, payments related to these guarantees and indemnities have been immaterial. We estimate the fair value of our indemnification obligations as insignificant based on this history and insurance coverage and have, therefore, not recorded any liability for these guarantees and indemnities in the accompanying consolidated balance sheets.

Leases

12 Months Ended

Dec. 31, 2017

Leases [Abstract]

Leases

We lease certain facilities and equipment for periods ranging from one to ten years. The leases generally are renewable and provide for the payment of property taxes, insurance and other costs relative to the property. Rental expense in 2017, 2016, and 2015 was $5.0 million, $4.9 million, and $8.5 million, respectively. Future minimum rental payments under operating leases having initial or remaining non-cancelable terms in excess of one year at December 31, 2017 were as follows:



	(In thousands)
2018	$	3,586
2019	2,793
2020	2,554
2021	1,927
2022	947
Thereafter	553
Total	$	12,360

Income Taxes

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Income Taxes

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



	(In thousands) Years Ended December 31,
	2017			2016		2015
Current tax expense (benefit)
Federal	$	2,387		$	5,953	$	(1,511	)
State	525			2,982		(418		)
	2,912			8,935		(1,929		)
Deferred tax (benefit) expense
Federal	(15,515		)	3,876		(28,011		)
State	135			41		(1,771		)
	(15,380		)	3,917		(29,782		)
Income tax (benefit) expense	$	(12,468	)	$	12,852	$	(31,711	)

On December 22, 2017, the President of the United States signed into law the Tax Cuts and Jobs Act (the “2017 Tax Act”) which, among a broad range of tax reform measures, reduced the U.S. corporate tax rate from 35.0% to 21.0% effective January 1, 2018. The reduction in the corporate tax rate required the federal portion of our deferred tax assets and liabilities at December 31, 2017 to be re-measured at the enacted tax rate expected to apply when the temporary differences are to be realized or settled using 21.0%. As a result, we recorded a provisional deferred income tax benefit of $13.0 million related to the re-measurement for the year ended December 31, 2017. SEC Staff Accounting Bulletin No. 118, “Income Tax Accounting Implications of the Tax Cuts and Jobs Act” (“SAB 118”), allows us to record provisional amounts during a measurement period not to extend beyond one year of the enactment date. Since the 2017 Tax Act was passed late in the fourth quarter of 2017, and ongoing guidance and accounting interpretation are expected over the next 12 months, we consider the accounting of the deferred tax re-measurement and other items to be incomplete due to the forthcoming guidance and our ongoing analysis of final year-end data and tax positions. We expect to complete our analysis within the measurement period in accordance with SAB 118.

ASU 2016-09, “Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting” (“ASU 2016-09”), became effective beginning January 1, 2017 and required all the tax effects related to share-based payments be recorded through the income statement. We recognized net income tax benefits from deductions of share-based payments in excess of compensation cost recognized for financial reporting purposes of $0.6 million for the year ended December 31, 2017. Prior to January 1, 2017, the current income tax expense (benefit) excluded net (tax shortfalls) excess tax benefits which were previously recorded directly to additional paid-in-capital in the amounts of $(0.1) million, and $0.6 million for the years ended December 31, 2016 and 2015, respectively.

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



	(In thousands) December 31,
	2017			2016
Deferred tax assets:
Accrued expenses	$	313		$	760
Allowance for doubtful accounts	208			184
Contract overrun reserves	294			1,776
Deferred compensation	177			507
Employment-related accruals	2,091			2,888
Environmental reserves	501			769
Federal tax credit carryforwards	5,613			4,234
Inventory reserves	1,315			2,313
Pension obligation	2,398			4,002
State net operating loss carryforwards	86			63
State tax credit carryforwards	9,051			6,585
Stock-based compensation	1,480			1,950
Workers’ compensation	75			122
Other	1,492			2,098
Total gross deferred tax assets	25,094			28,251
Valuation allowance	(9,013		)	(6,607		)
Total gross deferred tax assets, net of valuation allowance	16,081			21,644
Deferred tax liabilities:
Depreciation	(7,976		)	(13,167		)
Goodwill	(2,902		)	(3,909		)
Intangibles	(20,611		)	(35,071		)
Prepaid insurance	(312		)	(626		)
Unbilled receivables	—			(2		)
Total gross deferred tax liabilities	(31,801		)	(52,775		)
Net deferred tax liabilities	$	(15,720	)	$	(31,131	)

We have net operating losses in various states of $1.8 million as of December 31, 2017. The state net operating loss carryforwards include $1.3 million that is not expected to be realized under ASC Subtopic 740-10 and has been reduced by a valuation allowance. If not realized, the state net operating loss carryforwards will begin to expire in 2030.

We have federal and state tax credit carryforwards of $6.6 million and $12.8 million, respectively, as of December 31, 2017. A valuation allowance of $11.3 million has been provided on state tax credit carryforwards that are not expected to be realized under ASC Subtopic 740-10. If not realized, the federal and state tax credit carryforwards will expire between 2018 and 2037.

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

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



	Years Ended December 31,
	2017	2016	2015
Statutory federal income tax (benefit) rate	35.0%	35.0%	(35.0)%
State income taxes (net of federal benefit)	2.5	5.7	(1.2)
Qualified domestic production activities	(2.6)	(2.0)	0.5
Stock-based compensation expense	(8.2)	—	—
Research and development tax credits	(50.6)	(8.6)	(2.9)
Other tax credits	(7.5)	—	—
Goodwill impairment	—	—	8.1
Changes in valuation allowance	10.6	0.9	0.6
Non-deductible book expenses	1.1	0.2	0.2
Changes in deferred tax assets	15.4	1.5	0.1
Re-measurement of deferred taxes for 2017 Tax Act	(171.3)	—	—
Changes in tax reserves	11.4	—	0.1
Other	0.4	1.0	(0.2)
Effective income tax (benefit) rate	(163.8)%	33.7%	(29.7)%

The deduction for qualified domestic production activities is treated as a “special deduction” which has no effect on deferred tax assets and liabilities. Instead, the impact of this deduction is reported in our rate reconciliation. No deduction for qualified domestic production has been recognized in 2015 due to a taxable loss. As part of the 2017 Tax Act, the qualified domestic production deduction is repealed for tax years beginning after December 31, 2017.

We recorded a goodwill impairment charge related to the Structural Systems operating segment in 2015. A portion of this goodwill impairment charge was nondeductible for tax purposes and was a permanent impact to our income tax provision of $8.7 million.

Our total amount of unrecognized tax benefits was $5.3 million, $3.0 million, and $3.0 million at December 31, 2017, 2016, and 2015, respectively. We record interest and penalty charge, if any, related to uncertain tax positions as a component of tax expense and unrecognized tax benefits. The amounts accrued for interest and penalty charges as of December 31, 2017, 2016, and 2015 were not significant. If recognized, $3.4 million would affect the effective income tax rate. We do not reasonably expect significant increases or decreases to our unrecognized tax benefits in the next twelve months.

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



	(In thousands) Years Ended December 31,
	2017			2016			2015
Balance at January 1,	$	3,036		$	2,963		$	2,803
Additions for tax positions related to the current year	422			476			702
Additions for tax positions related to prior years	1,953			385			—
Reductions for tax positions related to prior years	(99		)	(567		)	(48		)
Reductions for lapse of statute of limitations	(41		)	(221		)	(494		)
Balance at December 31,	$	5,271		$	3,036		$	2,963

We file U.S. Federal and state income tax returns. During the fourth quarter of 2017, the Internal Revenue Service (“IRS”) completed the audit of tax years 2013, 2014, and 2015. Consequently, Federal income tax returns after 2015 are subject to examination. California franchise (income) tax returns after 2012 and other state income tax returns after 2012 are subject to examination. While we are no longer subject to examination prior to those periods, carryforwards generated prior to those periods may still be adjusted upon examination by the IRS or state taxing authority if they either have been or will be used in a subsequent period. We believe we have adequately accrued for tax deficiencies or reductions in tax benefits, if any, that could result from the examination and all open audit years.

Contingencies	12 Months Ended
Contingencies	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies Structural Systems has been directed by California environmental agencies to investigate and take corrective action for groundwater contamination at its facilities located in El Mirage and Monrovia, California. Based on currently available information, Ducommun has established an accrual for its estimated liability for such investigation and corrective action of $1.5 million at December 31, 2017, which is reflected in other long-term liabilities on its consolidated balance sheet. Structural Systems also faces liability as a potentially responsible party for hazardous waste disposed at landfills located in Casmalia and West Covina, California. Structural Systems and other companies and government entities have entered into consent decrees with respect to these landfills with the United States Environmental Protection Agency and/or California environmental agencies under which certain investigation, remediation and maintenance activities are being performed. Based on currently available information, Ducommun preliminarily estimates that the range of its future liabilities in connection with the landfill located in West Covina, California is between $0.4 million and $3.1 million. Ducommun has established an accrual for its estimated liability in connection with the West Covina landfill of $0.4 million at December 31, 2017, which is reflected in other long-term liabilities on its consolidated balance sheet. Ducommun’s ultimate liability in connection with these matters will depend upon a number of factors, including changes in existing laws and regulations, the design and cost of construction, operation and maintenance activities, and the allocation of liability among potentially responsible parties. In the normal course of business, Ducommun and its subsidiaries are defendants in certain other litigation, claims and inquiries, including matters relating to environmental laws. In addition, Ducommun makes various commitments and incurs contingent liabilities. While it is not feasible to predict the outcome of these matters, Ducommun does not presently expect that any sum it may be required to pay in connection with these matters would have a material adverse effect on its consolidated financial position, results of operations or cash flows.

Major Customers and Concentrations of Credit Risk

12 Months Ended

Dec. 31, 2017

Risks and Uncertainties [Abstract]

Major Customers and Concentrations of Credit Risk

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



	Years Ended December 31,
	2017		2016		2015
Boeing	16.4	%	17.3	%	16.0	%
Lockheed Martin	5.5	%	5.6	%	1.2	%
Raytheon	13.5	%	8.4	%	8.7	%
Spirit	8.2	%	8.2	%	7.4	%
United Technologies	4.7	%	5.3	%	6.1	%
Top ten customers⁽¹⁾	62.5	%	58.6	%	55.7	%

(1) Includes Boeing, Raytheon, Spirit, and United Technologies for 2017, 2016, and 2015 and Lockheed Martin for 2017 and 2016.

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



	December 31,
	2017		2016
Boeing	7.8	%	7.8	%
Lockheed Martin	5.9	%	2.9	%
Raytheon	1.4	%	10.9	%
Spirit	13.5	%	9.0	%
United Technologies	2.3	%	7.8	%

In 2017, 2016 and 2015, net revenues from foreign customers based on the location of the customer were $57.2 million, $56.4 million and $60.2 million, respectively. No net revenues from a foreign country were greater than 3.0% of total net revenues in 2017, 2016, and 2015. We have manufacturing facilities in Thailand and Mexico. Our net revenues, profitability and identifiable long-lived assets attributable to foreign revenues activity were not material compared to our net revenues, profitability and identifiable long-lived assets attributable to our domestic operations during 2017, 2016, and 2015. We are not subject to any significant foreign currency risks as all our sales are made in United States dollars.

Business Segment Information

12 Months Ended

Dec. 31, 2017

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, Structural Systems and Electronic Systems, each of which is an operating segment as well as a reportable segment.

Financial information by reportable segment was as follows:



	(In thousands) Years Ended December 31,
	2017			2016			2015
Net Revenues
Structural Systems	$	241,460		$	246,465		$	273,319
Electronic Systems	316,723			304,177			392,692
Total Net Revenues	$	558,183		$	550,642		$	666,011
Segment Operating Income (Loss) ⁽¹⁾⁽²⁾
Structural Systems	$	5,477		$	16,497		$	(53,010	)
Electronic Systems	30,940			28,983			(4,472		)
	36,417			45,480			(57,482		)
Corporate General and Administrative Expenses ⁽¹⁾⁽²⁾	(21,392		)	(16,912		)	(17,827		)
Operating Income (Loss)	$	15,025		$	28,568		$	(75,309	)
Depreciation and Amortization Expenses
Structural Systems	$	8,860		$	8,688		$	9,417
Electronic Systems	13,888			14,087			17,267
Corporate Administration	97			85			162
Total Depreciation and Amortization Expenses	$	22,845		$	22,860		$	26,846
Capital Expenditures
Structural Systems	$	20,679		$	15,661		$	11,559
Electronic Systems	5,019			3,032			4,419
Corporate Administration	775			—			10
Total Capital Expenditures	$	26,473		$	18,693		$	15,988


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


(2)	The results for 2017 includes LDS’ results of operations which have been included in our consolidated statements of operations since the date of acquisition as part of the Electronic Systems segment. See Note 2.

Segment assets include assets directly identifiable with each segment. Corporate assets include assets not specifically identified with a business segment, including cash. The following table summarizes our segment assets for 2017 and 2016:



	(In thousands) December 31,
	2017		2016
Total Assets
Structural Systems	$	193,600	$	175,580
Electronic Systems	362,831		325,780
Corporate Administration	10,322		14,069
Total Assets	$	566,753	$	515,429
Goodwill and Intangibles
Structural Systems	$	2,836	$	3,745
Electronic Systems	229,292		180,382
Total Goodwill and Intangibles	$	232,128	$	184,127

In the first quarter of 2016, we entered into and completed the sale of our Pittsburgh, Pennsylvania and Miltec operations, both of which were part of our Electronic Systems operating segment.

Supplemental Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Supplementary Quarterly Financial Data (Unaudited)

Supplemental Quarterly Financial Data (Unaudited)



	(In thousands, except per share amounts)
	Three Months Ended 2017									Three Months Ended 2016
	Dec 31			Sep 30		Jul 1		Apr 1		Dec 31		Oct 1		Jul 2		Apr 2
Net Revenues	$	142,258		$	138,690	$	140,938	$	136,297	$	142,486	$	132,571	$	133,437	$	142,148
Gross Profit	25,693			26,009		26,191		24,927		27,786		25,223		26,215		26,969
(Loss) Income Before Taxes	(5,057		)	5,595		4,564		2,507		5,825		6,248		5,331		20,709
Income Tax (Benefit) Expense	(14,541		)	940		741		392		2,989		1,234		1,470		7,159
Net Income	$	9,484		$	4,655	$	3,823	$	2,115	$	2,836	$	5,014	$	3,861	$	13,550
Earnings Per Share
Basic earnings per share	$	0.84		$	0.41	$	0.34	$	0.19	$	0.25	$	0.45	$	0.35	$	1.22
Diluted earnings per share	$	0.82		$	0.41	$	0.33	$	0.18	$	0.25	$	0.44	$	0.34	$	1.21

In the fourth quarter of 2017, we adopted the Tax Cuts and Jobs Act and as a result, recorded a provisional deferred income tax benefit of $13.0 million related to the re-measurement for the year ended December 31, 2017. See Note 16. In addition, we commenced a restructuring plan and recorded restructuring charges of $8.8 million (with $0.5 million recorded as costs of sales). See Note 3.

In the third quarter of 2017, we acquired 100.0% of the outstanding equity interests of LDS and LDS’ results of operations have been included in our consolidated statements of operations since the date of acquisition as part of the Electronic Systems segment. See Note 2.

In the first quarter of 2016, we entered into and completed the sale of our Pittsburgh, Pennsylvania and Miltec operations, both of which were part of our Electronic Systems operating segment. We recorded a preliminary pre-tax gain of $18.8 million.

Consolidated Valuation And Qualifying Accounts

12 Months Ended

Dec. 31, 2017

Valuation and Qualifying Accounts [Abstract]

Consolidated Valuation And Qualifying Accounts

DUCOMMUN INCORPORATED AND SUBSIDIARIES

CONSOLIDATED VALUATION AND QUALIFYING ACCOUNTS

YEARS ENDED DECEMBER 31, 2017, 2016, AND 2015

(in thousands)

SCHEDULE II



Description	Balance at Beginning of Period		Charged to Costs and Expenses (1)			Deductions/(Recoveries)			Balance at End of Period
2017
Allowance for Doubtful Accounts	$	495	$	334		$	(39	)	$	868
Valuation Allowance on Deferred Tax Assets	6,607		2,406			—			9,013
2016
Allowance for Doubtful Accounts	$	359	$	233		$	97		$	495
Valuation Allowance on Deferred Tax Assets	7,477		(870		)	—			6,607
2015
Allowance for Doubtful Accounts ⁽¹⁾	$	252	$	235		$	128		$	359
Valuation Allowance on Deferred Tax Assets	6,882		595			—			7,477


(1)	Included amount that was part of assets held for sale.

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Description of Business

Basis of Presentation

Use of Estimates

Reclassifications

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

Fair Value

Cash Equivalents

Derivative Instruments

Allowance for Doubtful Accounts

Inventories

We net progress payments from customers related to inventory purchases against inventories in the consolidated balance sheets.

Production Cost of Contracts

Property and Equipment and Depreciation

Goodwill and Indefinite-Lived Intangible Asset

Other Intangible Assets

Accumulated Other Comprehensive Loss

Revenue Recognition

Provision for Estimated Losses on Contracts

Income Taxes

Litigation and Commitments

Environmental Liabilities

Accounting for Stock-Based Compensation

Earnings (Loss) per Share

Earnings (Loss) Per Share

Recent Accounting Pronouncements

New Accounting Guidance Adopted in 2017

Recently Issued Accounting Standards


•	December 2016, the FASB issued ASU 2016-20, “Technical Corrections and Improvements to Topic 606, Revenue from Contracts with Customers” (“ASU 2016-20”);


•	May 2016, the FASB issued ASU 2016-12, “Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients” (“ASU 2016-12”);


•	May 2016, the FASB issued ASU 2016-11, “Revenue Recognition (Topic 605) and Derivatives and Hedging (Topic 815): Rescission of SEC Guidance Because of Accounting Standards Updates 2014-09 and 2014-06 Pursuant to Staff Announcements at the March 3, 2016 EITF Meeting” (“ASU 2016-11”);


•	April 2016, the FASB issued ASU 2016-10, “Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing” (“ASU 2016-10”); and


•	August 2015, the FASB issued ASU 2015-14, “Revenue From Contracts With Customers (Topic 606)” (“ASU 2015-14”).

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Schedule of Cash Flow, Supplemental Disclosures

Supplemental Cash Flow Information



	(In thousands) Years Ended December 31,
	2017		2016		2015
Interest paid	$	7,307	$	6,877	$	26,501
Taxes paid	$	3,125	$	9,778	$	1,150
Non-cash activities:
Purchases of property and equipment not paid	$	2,104	$	3,241	$	1,549

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

The net earnings (loss) and weighted-average number of common shares outstanding used to compute earnings (loss) per share were as follows:



	(In thousands, except per share data) Years Ended December 31,
	2017		2016		2015
Net income (loss)	$	20,077	$	25,261	$	(74,879	)
Weighted-average number of common shares outstanding
Basic weighted-average common shares outstanding	11,290		11,151		11,047
Dilutive potential common shares	268		148		—
Diluted weighted-average common shares outstanding	11,558		11,299		11,047
Earnings (loss) per share
Basic	$	1.78	$	2.27	$	(6.78	)
Diluted	$	1.74	$	2.24	$	(6.78	)

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



	(In thousands) Years Ended December 31,
	2017	2016	2015
Stock options and stock units	126	553	778

Business Combination (Tables)

12 Months Ended

Dec. 31, 2017

Business Combinations [Abstract]

Schedule of Business Acquisitions, by Acquisition

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



	Estimated Fair Value
Cash	$	2,223
Accounts receivable	918
Inventories	1,732
Other current assets	54
Property and equipment	138
Intangible assets	22,400
Goodwill	34,881
Total assets acquired	62,346
Current liabilities	(325		)
Total liabilities assumed	(325		)
Total purchase price allocation	$	62,021

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



	Useful Life (In years)	Estimated Fair Value (In thousands)
Intangible assets:
Customer relationships	15	$	21,100
Trade name	15	1,300
		$	22,400

Restructuring Activities (Tables)

12 Months Ended

Dec. 31, 2017

Restructuring and Related Activities [Abstract]

Schedule of Restructuring Activities

Our restructuring activities for 2017 and 2016 were as follows (in thousands):



	December 31, 2016		2017										December 31, 2017
	Balance		Charges		Cash Payments			Non-Cash Payments			Change in Estimates		Balance
Severance and benefits	$	—	$	3,337	$	(678	)	$	—		$	—	$	2,659
Modification of stock-based compensation awards	—		1,334		—			(1,334		)	—		—
Lease termination	654		18		(670		)	—			64		66
Property and equipment impairment due to restructuring	—		3,607		—			(3,607		)	—		—
Inventory write down	—		478		—			(478		)	—		—
Ending balance	$	654	$	8,774	$	(1,348	)	$	(5,419	)	$	64	$	2,725

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Schedule of Fair Value Measurements

Assets and liabilities measured at fair value on a recurring basis were as follows (in thousands):



	As of December 31, 2017								As of December 31, 2016
	Fair Value Measurements Using								Fair Value Measurements Using
	Level 1		Level 2		Level 3		Total Balance		Level 1		Level 2		Level 3		Total Balance
Assets
Money market funds⁽¹⁾	$	26	$	—	$	—	$	26	$	3,751	$	—	$	—	$	3,751
Interest rate cap hedges⁽²⁾	—		165		—		165		—		553		—		553
Total Assets	$	26	$	165	$	—	$	191	$	3,751	$	553	$	—	$	4,304

(1) Included as cash and cash equivalents.

(2) Interest rate cap hedge premium included as other current assets and other assets.

- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

+ References + Details

Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments

The recorded fair value of the derivative financial instruments in the consolidated balance sheets were as follows:



	(In thousands) December 31, 2017				(In thousands) December 31, 2016
	Other Current Assets		Other Long Term Assets		Other Current Assets		Other Long Term Assets
Derivatives Designated as Hedging Instruments
Cash Flow Hedges:
Interest rate cap premiums	$	—	$	165	$	—	$	553

Total Derivatives	$	—	$	165	$	—	$	553

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41641-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41678-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41638-113959

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579240-113959

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41620-113959

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(n)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Inventories (Tables)

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Summary of Inventories

Inventories consisted of the following:



	(In thousands) December 31,
	2017		2016
Raw materials and supplies	$	65,221	$	64,650
Work in process	62,584		56,806
Finished goods	10,665		9,180
	138,470		130,636
Less progress payments	16,309		10,740
Total	$	122,161	$	119,896

Property and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Summary of Property and Equipment

Property and equipment, net consisted of the following:



	(In thousands) December 31,				Range of Estimated
	2017		2016		Useful Lives
Land	$	15,662	$	15,662
Buildings and improvements	57,024		49,870		5 - 40 Years
Machinery and equipment	146,175		137,555		2 - 20 Years
Furniture and equipment	21,127		21,749		2 - 10 Years
Construction in progress	13,480		12,238
	253,468		237,074
Less accumulated depreciation	143,216		135,484
Total	$	110,252	$	101,590

Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The carrying amounts of goodwill, all in our Electronic Systems segment, for the years ended December 31, 2017 and 2016 were as follows:



	(In thousands)
Gross goodwill	$	164,276
Accumulated goodwill impairment	(81,722		)
Balance at December 31, 2016	82,554
Goodwill from acquisition during the period	34,881
Balance at December 31, 2017	$	117,435

Other Intangible Assets

Intangible assets are as follows:



		(In thousands)
		December 31, 2017						December 31, 2016
	Wtd. Avg Life (Yrs)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Finite-lived assets
Customer relationships	17	$	180,300	$	67,449	$	112,851	$	159,200	$	58,352	$	100,848
Trade names	15	1,300		26		1,274		—		—		—
Contract renewal	14	1,845		1,493		352		1,845		1,362		483
Technology	15	400		184		216		400		158		242
Total		$	183,845	$	69,152	$	114,693	$	161,445	$	59,872	$	101,573

The carrying amount of other intangible assets by operating segment as of December 31, 2017 and 2016 was as follows:



	(In thousands)
	December 31, 2017						December 31, 2016
	Gross		Accumulated Amortization		Net Carrying Value		Gross		Accumulated Amortization		Net Carrying Value
Other intangible assets
Structural Systems	$	19,300	$	16,464	$	2,836	$	19,300	$	15,555	$	3,745
Electronic Systems	164,545		52,688		111,857		142,145		44,317		97,828
Total	$	183,845	$	69,152	$	114,693	$	161,445	$	59,872	$	101,573

Summary of Future Amortization Expense

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



	(In thousands)
	Structural Systems		Electronic Systems		Consolidated Ducommun
2018	$	737	$	9,420	$	10,157
2019	591		9,419		10,010
2020	490		9,348		9,838
2021	381		9,287		9,668
2022	320		9,288		9,608
Thereafter	317		65,095		65,412
	$	2,836	$	111,857	$	114,693

Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Long Term Debt Summary

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



	(In thousands) December 31,
	2017			2016
Term loan	$	160,000		$	170,000
Revolving credit facility	58,100			—
Other debt (fixed 5.41%)	—			3
Total debt	218,100			170,003
Less current portion	—			3
Total long-term debt	218,100			170,000
Less debt issuance costs	2,045			3,104
Total long-term debt, net of debt issuance costs	$	216,055		$	166,896
Weighted-average interest rate	3.73		%	3.25		%

Future Long Term Debt Payments

Future long-term debt payments at December 31, 2017 were as follows:



	(In thousands)
2018	$	—
2019	—
2020	218,100
2021	—
2022	—
Total	$	218,100

- 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://www.xbrl.org/2003/role/presentationRef
-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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-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 4: http://www.xbrl.org/2003/role/presentationRef
-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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644

+ Details

Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2017

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Option Activity

Stock option activity for the year ended December 31, 2017 were as follows:



	Number of Stock Options		Weighted- Average Exercise Price Per Share		Weighted-Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value (in thousands)
Outstanding at January 1, 2017	439,550		$	20.07
Granted	129,400		$	29.19
Exercised	(212,775	)	$	20.38
Expired	(5,800	)	$	21.12
Forfeited	(44,150	)	$	22.19
Outstanding at December 31, 2017	306,225		$	23.38	5.2	$	1,654
Exerciseable at December 31, 2017	86,425		$	20.78	2.9	$	663

Schedule of Nonvested Options Activity

Changes in nonvested stock options for the year ended December 31, 2017 were as follows:



	Number of Stock Options		Weighted- Average Grant Date Fair Value
Nonvested at January 1, 2017	225,175		$	8.77
Granted	129,400		$	11.88
Vested	(90,625	)	$	8.87
Forfeited	(44,150	)	$	7.93
Nonvested at December 31, 2017	219,800		$	11.07

Schedule of Assumptions Used

The assumptions used to compute the fair value of stock option grants under the Stock Incentive Plans for years ended December 31, 2017, 2016, and 2015 were as follows:



	Years Ended December 31,
	2017		2016		2015
Risk-free interest rate	1.75	%	1.20	%	1.13	%
Expected volatility	50.37	%	51.79	%	53.72	%
Expected dividends	—		—		—
Expected term (in months)	48		48		47

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



	Years Ended December 31,
	2017		2016		2015
Discount rate used to determine pension expense
Pension Plan	4.18	%	4.55	%	4.25	%
LaBarge Retirement Plan	3.75	%	4.00	%	3.70	%

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



	December 31,
	2017		2016		2015
Discount rate used to determine value of obligations
Pension Plan	3.64	%	4.18	%	4.55	%
LaBarge Retirement Plan	3.40	%	3.75	%	4.00	%
Long-term rate of return - Pension Plan only	7.00	%	7.50	%	7.50	%

Schedule of Restricted Stock Units Activity

Restricted stock unit activity for the year ended December 31, 2017 was as follows:



	Number of Restricted Stock Units		Weighted- Average Grant Date Fair Value
Outstanding at January 1, 2017	193,382		$	18.88
Granted	135,350		$	28.97
Vested	(101,930	)	$	19.66
Forfeited	(41,458	)	$	21.93
Outstanding at December 31, 2017	185,344		$	25.14

Schedule of Performance-based Units Activity

Performance stock activity for the year ended December 31, 2017 was as follows:



	Number of Performance Stock Units		Weighted- Average Grant Date Fair Value
Outstanding at January 1, 2017	121,637		$	20.39
Granted	126,000		$	26.31
Adjustment for target performance	37,350		$	25.48
Vested	(43,487	)	$	24.98
Forfeited	(20,000	)	$	22.63
Outstanding at December 31, 2017	221,500		$	23.52

Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2017

Retirement Benefits [Abstract]

Components of Net Periodic Pension Cost

The components of net periodic pension cost for both plans are as follows:



	(In thousands) Years Ended December 31,
	2017			2016			2015
Service cost	$	531		$	531		$	785
Interest cost	1,329			1,367			1,350
Expected return on plan assets	(1,530		)	(1,482		)	(1,495		)
Amortization of actuarial losses	810			762			887
Net periodic pension cost	$	1,140		$	1,178		$	1,527

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 2017 were as follows:



	(In thousands) Year Ended December 31,
	2017
Amortization of actuarial loss - total before tax ⁽¹⁾	$	810
Tax benefit	(302		)
Net of tax	$	508


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

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

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



	(In thousands) December 31,
	2017			2016
Change in benefit obligation⁽¹⁾
Beginning benefit obligation (January 1)	$	33,154		$	31,510
Service cost	531			531
Interest cost	1,329			1,367
Actuarial loss	2,449			1,132
Benefits paid	(1,461		)	(1,386		)
Ending benefit obligation (December 31)	$	36,002		$	33,154
Change in plan assets
Beginning fair value of plan assets (January 1)	$	22,015		$	19,933
Return on assets	3,481			1,551
Employer contribution	1,611			1,917
Benefits paid	(1,461		)	(1,386		)
Ending fair value of plan assets (December 31)	$	25,646		$	22,015
Funded status (underfunded)	$	(10,356	)	$	(11,139	)
Amounts recognized in the consolidated balance sheet
Current liabilities	$	560		$	544
Non-current liabilities	$	9,796		$	10,595
Unrecognized loss included in accumulated other comprehensive loss
Beginning unrecognized loss, before tax (January 1)	$	9,220		$	8,919
Amortization	(810		)	(762		)
Liability loss	2,449			1,132
Asset gain	(1,951		)	(69		)
Ending unrecognized loss, before tax (December 31)	8,908			9,220
Tax impact	(3,309		)	(3,425		)
Unrecognized loss included in accumulated other comprehensive loss, net of tax	$	5,599		$	5,795


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

Company's Pension Plan Asset Allocation, by Asset Category



	(In thousands) Year Ended December 31, 2017
	Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	135	$	—	$	—	$	135
Fixed income securities	3,494		—		—		3,494
Equities⁽¹⁾	1,625		—		—		1,625
Other investments	910		—		—		910
Total plan assets at fair value	$	6,164	$	—	$	—	6,164
Pooled funds							19,482
Total fair value of plan assets							$	25,646



	(In thousands) Year Ended December 31, 2016
	Level 1		Level 2		Level 3		Total
Cash and cash equivalents	$	366	$	—	$	—	$	366
Fixed income securities	3,468		—		—		3,468
Equities⁽¹⁾	1,611		—		—		1,611
Other investments	760		—		—		760
Total plan assets at fair value	$	6,205	$	—	$	—	6,205
Pooled funds							15,810
Total fair value of plan assets							$	22,015


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

Our Pension Plan asset allocations at December 31, 2017 and 2016, by asset category, were as follows:



	December 31,
	2017		2016
Equity securities	70	%	65	%
Cash and equivalents	1	%	2	%
Debt securities	29	%	33	%
Total⁽¹⁾	100	%	100	%


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



Cash	0-5%
Fixed income securities	15-75%
Equities	30-80%

Weighted Average Assumptions Used to Determine Net Periodic Benefit Cost

The assumptions used to compute the fair value of stock option grants under the Stock Incentive Plans for years ended December 31, 2017, 2016, and 2015 were as follows:



	Years Ended December 31,
	2017		2016		2015
Risk-free interest rate	1.75	%	1.20	%	1.13	%
Expected volatility	50.37	%	51.79	%	53.72	%
Expected dividends	—		—		—
Expected term (in months)	48		48		47

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



	Years Ended December 31,
	2017		2016		2015
Discount rate used to determine pension expense
Pension Plan	4.18	%	4.55	%	4.25	%
LaBarge Retirement Plan	3.75	%	4.00	%	3.70	%

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



	December 31,
	2017		2016		2015
Discount rate used to determine value of obligations
Pension Plan	3.64	%	4.18	%	4.55	%
LaBarge Retirement Plan	3.40	%	3.75	%	4.00	%
Long-term rate of return - Pension Plan only	7.00	%	7.50	%	7.50	%

Expected Future Benefit Payments Under Pension Plans

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



	(In thousands)
	Pension Plan		LaBarge Retirement Plan
2018	$	1,178	$	561
2019	1,212		546
2020	1,288		528
2021	1,365		506
2022	1,453		482
2023 - 2027	8,246		2,022

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Income Tax Disclosure [Abstract]

Summary of Provision for Income Tax Expense (Benefit)

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



	(In thousands) Years Ended December 31,
	2017			2016		2015
Current tax expense (benefit)
Federal	$	2,387		$	5,953	$	(1,511	)
State	525			2,982		(418		)
	2,912			8,935		(1,929		)
Deferred tax (benefit) expense
Federal	(15,515		)	3,876		(28,011		)
State	135			41		(1,771		)
	(15,380		)	3,917		(29,782		)
Income tax (benefit) expense	$	(12,468	)	$	12,852	$	(31,711	)

Summary of Deferred Tax Assets (Liabilities)

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



	(In thousands) December 31,
	2017			2016
Deferred tax assets:
Accrued expenses	$	313		$	760
Allowance for doubtful accounts	208			184
Contract overrun reserves	294			1,776
Deferred compensation	177			507
Employment-related accruals	2,091			2,888
Environmental reserves	501			769
Federal tax credit carryforwards	5,613			4,234
Inventory reserves	1,315			2,313
Pension obligation	2,398			4,002
State net operating loss carryforwards	86			63
State tax credit carryforwards	9,051			6,585
Stock-based compensation	1,480			1,950
Workers’ compensation	75			122
Other	1,492			2,098
Total gross deferred tax assets	25,094			28,251
Valuation allowance	(9,013		)	(6,607		)
Total gross deferred tax assets, net of valuation allowance	16,081			21,644
Deferred tax liabilities:
Depreciation	(7,976		)	(13,167		)
Goodwill	(2,902		)	(3,909		)
Intangibles	(20,611		)	(35,071		)
Prepaid insurance	(312		)	(626		)
Unbilled receivables	—			(2		)
Total gross deferred tax liabilities	(31,801		)	(52,775		)
Net deferred tax liabilities	$	(15,720	)	$	(31,131	)

Principle Reasons for Variation Between Expected and Effective Tax Rate

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



	Years Ended December 31,
	2017	2016	2015
Statutory federal income tax (benefit) rate	35.0%	35.0%	(35.0)%
State income taxes (net of federal benefit)	2.5	5.7	(1.2)
Qualified domestic production activities	(2.6)	(2.0)	0.5
Stock-based compensation expense	(8.2)	—	—
Research and development tax credits	(50.6)	(8.6)	(2.9)
Other tax credits	(7.5)	—	—
Goodwill impairment	—	—	8.1
Changes in valuation allowance	10.6	0.9	0.6
Non-deductible book expenses	1.1	0.2	0.2
Changes in deferred tax assets	15.4	1.5	0.1
Re-measurement of deferred taxes for 2017 Tax Act	(171.3)	—	—
Changes in tax reserves	11.4	—	0.1
Other	0.4	1.0	(0.2)
Effective income tax (benefit) rate	(163.8)%	33.7%	(29.7)%

Reconciliation of Unrecognized Tax Benefits

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



	(In thousands) Years Ended December 31,
	2017			2016			2015
Balance at January 1,	$	3,036		$	2,963		$	2,803
Additions for tax positions related to the current year	422			476			702
Additions for tax positions related to prior years	1,953			385			—
Reductions for tax positions related to prior years	(99		)	(567		)	(48		)
Reductions for lapse of statute of limitations	(41		)	(221		)	(494		)
Balance at December 31,	$	5,271		$	3,036		$	2,963

Major Customers and Concentrations of Credit Risk (Tables)

12 Months Ended

Dec. 31, 2017

Risks and Uncertainties [Abstract]

Schedule of Concentration Risk by Major Customers

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



	Years Ended December 31,
	2017		2016		2015
Boeing	16.4	%	17.3	%	16.0	%
Lockheed Martin	5.5	%	5.6	%	1.2	%
Raytheon	13.5	%	8.4	%	8.7	%
Spirit	8.2	%	8.2	%	7.4	%
United Technologies	4.7	%	5.3	%	6.1	%
Top ten customers⁽¹⁾	62.5	%	58.6	%	55.7	%

(1) Includes Boeing, Raytheon, Spirit, and United Technologies for 2017, 2016, and 2015 and Lockheed Martin for 2017 and 2016.

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



	December 31,
	2017		2016
Boeing	7.8	%	7.8	%
Lockheed Martin	5.9	%	2.9	%
Raytheon	1.4	%	10.9	%
Spirit	13.5	%	9.0	%
United Technologies	2.3	%	7.8	%

Business Segment Information (Tables)

12 Months Ended

Dec. 31, 2017

Segment Reporting [Abstract]

Financial Information by Reportable Segment

Financial information by reportable segment was as follows:



	(In thousands) Years Ended December 31,
	2017			2016			2015
Net Revenues
Structural Systems	$	241,460		$	246,465		$	273,319
Electronic Systems	316,723			304,177			392,692
Total Net Revenues	$	558,183		$	550,642		$	666,011
Segment Operating Income (Loss) ⁽¹⁾⁽²⁾
Structural Systems	$	5,477		$	16,497		$	(53,010	)
Electronic Systems	30,940			28,983			(4,472		)
	36,417			45,480			(57,482		)
Corporate General and Administrative Expenses ⁽¹⁾⁽²⁾	(21,392		)	(16,912		)	(17,827		)
Operating Income (Loss)	$	15,025		$	28,568		$	(75,309	)
Depreciation and Amortization Expenses
Structural Systems	$	8,860		$	8,688		$	9,417
Electronic Systems	13,888			14,087			17,267
Corporate Administration	97			85			162
Total Depreciation and Amortization Expenses	$	22,845		$	22,860		$	26,846
Capital Expenditures
Structural Systems	$	20,679		$	15,661		$	11,559
Electronic Systems	5,019			3,032			4,419
Corporate Administration	775			—			10
Total Capital Expenditures	$	26,473		$	18,693		$	15,988


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


(2)	The results for 2017 includes LDS’ results of operations which have been included in our consolidated statements of operations since the date of acquisition as part of the Electronic Systems segment. See Note 2

Segment Assets

Corporate assets include assets not specifically identified with a business segment, including cash. The following table summarizes our segment assets for 2017 and 2016:



	(In thousands) December 31,
	2017		2016
Total Assets
Structural Systems	$	193,600	$	175,580
Electronic Systems	362,831		325,780
Corporate Administration	10,322		14,069
Total Assets	$	566,753	$	515,429
Goodwill and Intangibles
Structural Systems	$	2,836	$	3,745
Electronic Systems	229,292		180,382
Total Goodwill and Intangibles	$	232,128	$	184,127

Supplemental Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information



	(In thousands, except per share amounts)
	Three Months Ended 2017									Three Months Ended 2016
	Dec 31			Sep 30		Jul 1		Apr 1		Dec 31		Oct 1		Jul 2		Apr 2
Net Revenues	$	142,258		$	138,690	$	140,938	$	136,297	$	142,486	$	132,571	$	133,437	$	142,148
Gross Profit	25,693			26,009		26,191		24,927		27,786		25,223		26,215		26,969
(Loss) Income Before Taxes	(5,057		)	5,595		4,564		2,507		5,825		6,248		5,331		20,709
Income Tax (Benefit) Expense	(14,541		)	940		741		392		2,989		1,234		1,470		7,159
Net Income	$	9,484		$	4,655	$	3,823	$	2,115	$	2,836	$	5,014	$	3,861	$	13,550
Earnings Per Share
Basic earnings per share	$	0.84		$	0.41	$	0.34	$	0.19	$	0.25	$	0.45	$	0.35	$	1.22
Diluted earnings per share	$	0.82		$	0.41	$	0.33	$	0.18	$	0.25	$	0.44	$	0.34	$	1.21

Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended									12 Months Ended
	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jul. 01, 2017 USD ($)	Apr. 01, 2017 USD ($)	Dec. 31, 2016 USD ($)	Oct. 01, 2016 USD ($)	Jul. 02, 2016 USD ($)	Apr. 02, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 USD ($) Segment	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Significant Accounting Policies [Line Items]
Number of reportable segments \| Segment										2
Non-current deferred income taxes	$ 15,981,000				$ 31,417,000					$ 15,981,000	$ 31,417,000
Net (loss) income	9,484,000	$ 4,655,000	$ 3,823,000	$ 2,115,000	2,836,000	$ 5,014,000	$ 3,861,000	$ 13,550,000		$ 20,077,000	25,261,000	$ (74,879,000)
Cash equivalent maturity period										three months or less
Production cost of contracts	11,204,000				11,340,000					$ 11,204,000	11,340,000
Goodwill impairment										0	0	57,243,000
Goodwill	117,435,000				82,554,000					117,435,000	82,554,000
Carrying value of trade names									$ 0			0
Provision for forward loss reserves	$ 1,226,000				$ 4,780,000					1,226,000	$ 4,780,000
Tax Cuts And Jobs Act of 2017, deferred Income tax benefit										$ 13,000,000
Minimum
Significant Accounting Policies [Line Items]
Estimated useful life of intangible assets (in years)										14 years
Income tax benefit percentage										50.00%
Maximum
Significant Accounting Policies [Line Items]
Estimated useful life of intangible assets (in years)										18 years
Accrued Liabilities
Significant Accounting Policies [Line Items]
Provision for forward loss reserves									7,600,000			7,600,000
Other Long-term Liabilities
Significant Accounting Policies [Line Items]
Provision for forward loss reserves									2,400,000			2,400,000
Structural Systems
Significant Accounting Policies [Line Items]
Goodwill impairment												57,200,000
Goodwill									0			0
Forward loss provision												$ 10,000,000
Trade name
Significant Accounting Policies [Line Items]
Impairment of trade names									$ 32,900,000

Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Supplemental Cash Flow Information [Abstract]
Interest paid	$ 7,307	$ 6,877	$ 26,501
Taxes paid	3,125	9,778	1,150
Non-cash activities:
Purchases of property and equipment not paid	$ 2,104	$ 3,241	$ 1,549

Summary of Significant Accounting Policies - Weighted Average Number of Shares Outstanding Used to Compute Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Net Income	$ 9,484	$ 4,655	$ 3,823	$ 2,115	$ 2,836	$ 5,014	$ 3,861	$ 13,550	$ 20,077	$ 25,261	$ (74,879)
Weighted-average number of common shares outstanding
Basic weighted-average common shares outstanding (in shares)									11,290	11,151	11,047
Dilutive potential common shares (in shares)									268	148	0
Diluted weighted-average common shares outstanding (in shares)									11,558	11,299	11,047
Earnings (Loss) Per Share
Basic (in dollars per share)	$ 0.84	$ 0.41	$ 0.34	$ 0.19	$ 0.25	$ 0.45	$ 0.35	$ 1.22	$ 1.78	$ 2.27	$ (6.78)
Diluted (in dollars per share)	$ 0.82	$ 0.41	$ 0.33	$ 0.18	$ 0.25	$ 0.44	$ 0.34	$ 1.21	$ 1.74	$ 2.24	$ (6.78)

Summary of Significant Accounting Policies - Weighted Average Number of Shares Outstanding Excluded from Computation of Diluted Earnings (Detail) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Stock Options And Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options and stock units	126	553	778

Business Combination - Narrative (Details) - USD ($) $ in Thousands		1 Months Ended	12 Months Ended
	Sep. 11, 2017	Oct. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2017
Business Acquisition [Line Items]
Purchase price, net of cash acquired			$ 59,798	$ 0	$ 0
Goodwill			117,435	$ 82,554
Lightning Diversion Systems, Inc.
Business Acquisition [Line Items]
Equity interest acquired	100.00%					100.00%
Purchase price, net of cash acquired	$ 60,000
Payments to acquire business	61,400	$ 600
Gross purchase price	62,021
Intangible assets	22,400
Goodwill	$ 34,881
Acquisition related costs			$ 300

Business Combination - Fair Value of Assets and Liabilities Acquired (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Sep. 11, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill	$ 117,435		$ 82,554
Lightning Diversion Systems, Inc.
Business Acquisition [Line Items]
Cash		$ 2,223
Accounts receivable		918
Inventories		1,732
Other current assets		54
Property and equipment		138
Intangible assets		22,400
Goodwill		34,881
Total assets acquired		62,346
Current liabilities		(325)
Total liabilities assumed		(325)
Total purchase price allocation		$ 62,021

Business Combination - Estimated Fair Value of Intangible Assets Acquired (Details) - USD ($) $ in Thousands		12 Months Ended
	Sep. 11, 2017	Dec. 31, 2017
Lightning Diversion Systems, Inc.
Business Acquisition [Line Items]
Intangible assets	$ 22,400
Customer relationships
Business Acquisition [Line Items]
Useful Life (In years)		17 years
Customer relationships \| Lightning Diversion Systems, Inc.
Business Acquisition [Line Items]
Useful Life (In years)	15 years
Intangible assets	$ 21,100
Trade name
Business Acquisition [Line Items]
Useful Life (In years)		15 years
Trade name \| Lightning Diversion Systems, Inc.
Business Acquisition [Line Items]
Useful Life (In years)	15 years
Intangible assets	$ 1,300

Restructuring Activities (Detail) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
Restructuring Activities (Detail) $ in Thousands	May 31, 2016 facility	Dec. 31, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Restructuring Cost and Reserve [Line Items]
Number of facilities closed \| facility	1
Restructuring Reserve [Roll Forward]
Beginning balance				$ 654
Charges		$ 8,800		8,360	$ 182	$ 2,125
Ending balance		2,725		2,725	654
Severance and benefits
Restructuring Reserve [Roll Forward]
Beginning balance				0
Ending balance		2,659		2,659	0
Modification of stock-based compensation awards
Restructuring Reserve [Roll Forward]
Beginning balance				0
Ending balance		0		0	0
Lease termination
Restructuring Reserve [Roll Forward]
Beginning balance				654
Ending balance		66		66	654
Property and equipment impairment due to restructuring
Restructuring Reserve [Roll Forward]
Beginning balance				0
Ending balance		0		0	0
Inventory write down
Restructuring Reserve [Roll Forward]
Beginning balance				0
Ending balance		0		0	$ 0
Electronic Systems
Restructuring Cost and Reserve [Line Items]
Accrued severance and loss on early exit		1,000		1,000
Electronic Systems \| Severance and benefits
Restructuring Reserve [Roll Forward]
Charges				1,200
Structural Systems
Restructuring Cost and Reserve [Line Items]
Inventory Write-down				500
Accrued severance and loss on early exit		1,300		1,300
Structural Systems \| Severance and benefits
Restructuring Reserve [Roll Forward]
Charges				1,700
Corporate Segment
Restructuring Cost and Reserve [Line Items]
Accrued severance and loss on early exit		400		400
Corporate Segment \| Severance and benefits
Restructuring Reserve [Roll Forward]
Charges				400
Corporate Segment \| Modification of stock-based compensation awards
Restructuring Reserve [Roll Forward]
Charges				1,400
Restructuring Plan, 2017
Restructuring Reserve [Roll Forward]
Charges				8,774
Cash Payments				(1,348)
Non-Cash Payments				5,419
Change in Estimates				64
Restructuring Plan, 2017 \| Severance and benefits
Restructuring Reserve [Roll Forward]
Charges				3,337
Cash Payments				(678)
Non-Cash Payments				0
Change in Estimates				0
Restructuring Plan, 2017 \| Modification of stock-based compensation awards
Restructuring Reserve [Roll Forward]
Charges				1,334
Cash Payments				0
Non-Cash Payments				1,334
Change in Estimates				0
Restructuring Plan, 2017 \| Lease termination
Restructuring Reserve [Roll Forward]
Charges				18
Cash Payments				(670)
Non-Cash Payments				0
Change in Estimates				64
Restructuring Plan, 2017 \| Property and equipment impairment due to restructuring
Restructuring Reserve [Roll Forward]
Charges				3,607
Cash Payments				0
Non-Cash Payments				3,607
Change in Estimates				0
Restructuring Plan, 2017 \| Inventory write down
Restructuring Reserve [Roll Forward]
Charges				478
Cash Payments				0
Non-Cash Payments				478
Change in Estimates				0
Restructuring Plan, 2016 \| Severance and benefits
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred to date		200		200
Restructuring Plan, 2016 \| Electronic Systems
Restructuring Reserve [Roll Forward]
Ending balance		100		100
Restructuring Plan, 2015 \| Severance and benefits
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred to date		2,200		2,200
Minimum \| Restructuring Plan, 2017
Restructuring Cost and Reserve [Line Items]
Expected restructuring cost		19,000		19,000
Maximum \| Restructuring Plan, 2017
Restructuring Cost and Reserve [Line Items]
Expected restructuring cost		$ 22,000		$ 22,000
Scenario, Forecast \| Restructuring Plan, 2017
Restructuring Reserve [Roll Forward]
Effect on Future Earnings, Amount			$ 14,000

Fair Value Measurements (Details) - Recurring Measurement - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	$ 26	$ 3,751
Interest rate cap hedges	165	553
Total Assets	191	4,304
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	26	3,751
Interest rate cap hedges	0	0
Total Assets	26	3,751
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	0	0
Interest rate cap hedges	165	553
Total Assets	165	553
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds	0	0
Interest rate cap hedges	0	0
Total Assets	$ 0	$ 0

Financial Instruments (Details) - USD ($)	12 Months Ended
Financial Instruments (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Interest rate cap hedges recognized in other comprehensive income, net of tax	$ (242,000)	$ (305,000)	$ 0
Other Current Assets
Derivative [Line Items]
Derivative asset	0	0
Other Long Term Assets
Derivative [Line Items]
Derivative asset	165,000	553,000
Interest rate cap premiums
Derivative [Line Items]
Interest rate cap hedges recognized in other comprehensive income, net of tax	200,000
Gain (loss) on derivative, net	0
Cash Flow Hedging \| Designated as Hedging Instrument \| Interest rate cap premiums \| Other Current Assets
Derivative [Line Items]
Derivative asset	0	0
Cash Flow Hedging \| Designated as Hedging Instrument \| Interest rate cap premiums \| Other Long Term Assets
Derivative [Line Items]
Derivative asset	$ 165,000	$ 553,000

Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 65,221	$ 64,650
Work in process	62,584	56,806
Finished goods	10,665	9,180
Total inventory, gross	138,470	130,636
Less progress payments	16,309	10,740
Total	$ 122,161	$ 119,896

Property and Equipment, Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 253,468	$ 237,074
Less accumulated depreciation	143,216	135,484
Total	110,252	101,590
Depreciation expense	13,200	13,300	$ 15,700
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	15,662	15,662
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 57,024	49,870
Buildings and improvements \| Minimum
Property, Plant and Equipment [Line Items]
Useful life	5 years
Buildings and improvements \| Maximum
Property, Plant and Equipment [Line Items]
Useful life	40 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 146,175	137,555
Machinery and equipment \| Minimum
Property, Plant and Equipment [Line Items]
Useful life	2 years
Machinery and equipment \| Maximum
Property, Plant and Equipment [Line Items]
Useful life	20 years
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 21,127	21,749
Furniture and equipment \| Minimum
Property, Plant and Equipment [Line Items]
Useful life	2 years
Furniture and equipment \| Maximum
Property, Plant and Equipment [Line Items]
Useful life	10 years
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 13,480	$ 12,238

Goodwill and Other Intangible Assets - Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 82,554
Goodwill, ending balance	117,435
Electronic Systems
Goodwill [Line Items]
Gross goodwill		$ 164,276
Accumulated goodwill impairment		$ (81,722)
Goodwill [Roll Forward]
Goodwill, beginning balance	82,554
Goodwill from acquisition during the period	34,881
Goodwill, ending balance	$ 117,435

Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands		12 Months Ended
	Sep. 11, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2017
Goodwill And Intangible Assets [Line Items]
Goodwill		$ 117,435	$ 82,554
Purchase price, net of cash acquired		59,798	0	$ 0
Amortization expense of intangible asset		$ 9,300	9,000	$ 10,000
Minimum
Goodwill And Intangible Assets [Line Items]
Acquired intangible assets amortization period		14 years
Maximum
Goodwill And Intangible Assets [Line Items]
Acquired intangible assets amortization period		18 years
Electronic Systems
Goodwill And Intangible Assets [Line Items]
Goodwill		$ 117,435	$ 82,554
Goodwill fair value in excess of carrying value			32.00%
Lightning Diversion Systems, Inc.
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 34,881
Equity interest acquired	100.00%				100.00%
Purchase price, net of cash acquired	$ 60,000
Gross purchase price	$ 62,021

Goodwill and Other Intangible Assets - Carrying Amount of Finite-lived and Other Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 183,845	$ 161,445
Accumulated Amortization	69,152	59,872
Net Carrying Amount	114,693	101,573
Structural Systems
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	19,300	19,300
Accumulated Amortization	16,464	15,555
Net Carrying Amount	2,836	3,745
Electronic Systems
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	164,545	142,145
Accumulated Amortization	52,688	44,317
Net Carrying Amount	$ 111,857	97,828
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets (in years)	17 years
Gross Carrying Amount	$ 180,300	159,200
Accumulated Amortization	67,449	58,352
Net Carrying Amount	$ 112,851	100,848
Trade Names
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets (in years)	15 years
Gross Carrying Amount	$ 1,300	0
Accumulated Amortization	26	0
Net Carrying Amount	$ 1,274	0
Contract renewal
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets (in years)	14 years
Gross Carrying Amount	$ 1,845	1,845
Accumulated Amortization	1,493	1,362
Net Carrying Amount	$ 352	483
Technology
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets (in years)	15 years
Gross Carrying Amount	$ 400	400
Accumulated Amortization	184	158
Net Carrying Amount	$ 216	$ 242

Goodwill and Other Intangible Assets - Future Amortization Expense of Other Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2018	$ 10,157
2019	10,010
2020	9,838
2021	9,668
2022	9,608
Thereafter	65,412
Net Carrying Amount	114,693	$ 101,573
Structural Systems
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2018	737
2019	591
2020	490
2021	381
2022	320
Thereafter	317
Net Carrying Amount	2,836	3,745
Electronic Systems
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2018	9,420
2019	9,419
2020	9,348
2021	9,287
2022	9,288
Thereafter	65,095
Net Carrying Amount	$ 111,857	$ 97,828

Accrued Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Accrued compensation	$ 18,925	$ 15,455
Accrued income tax and sales tax	71	332
Customer deposits	3,970	3,204
Provision for forward loss reserves	1,226	4,780
Other	4,137	5,508
Total	$ 28,329	$ 29,279

Long-Term Debt - Summary (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long-term debt, gross	$ 218,100	$ 170,003
Less current portion	0	3
Total long-term debt	218,100	170,000
Less debt issuance costs	2,045	3,104
Total long-term debt, net of debt issuance costs	$ 216,055	$ 166,896
Weighted-average interest rate (percent)	3.73%	3.25%
Term Loan
Debt Instrument [Line Items]
Long-term debt, gross	$ 160,000	$ 170,000
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross	58,100	0
Other Debt
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	$ 3
Fixed rate (percent)	5.41%

Long-Term Debt - Future Long-Term Debt Payment (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]
2018	$ 0
2019	0
2020	218,100
2021	0
2022	0
Total Debt	$ 218,100

Long-Term Debt - Additional information (Detail) - USD ($)		1 Months Ended			12 Months Ended
	Sep. 11, 2017	Oct. 31, 2017	Dec. 31, 2016	Oct. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Purchase price, net of cash acquired					$ 59,798,000	$ 0	$ 0
Interest rate cap premiums
Debt Instrument [Line Items]
Hedging asset				$ 135,000,000
Payments for hedging asset				$ 1,000,000
New Credit Facilities \| First Two Years
Debt Instrument [Line Items]
Prepayment percentage of principal					5.00%
New Credit Facilities \| Third Year
Debt Instrument [Line Items]
Prepayment percentage of principal					7.50%
New Credit Facilities \| Fourth and Fifth Year
Debt Instrument [Line Items]
Prepayment percentage of principal					10.00%
New Credit Facilities \| Federal Funds Rate
Debt Instrument [Line Items]
Fixed rate spread (percent)					0.50%
New Credit Facilities \| Eurodollar Rate
Debt Instrument [Line Items]
Fixed rate spread (percent)					1.00%
New Credit Facilities \| Minimum
Debt Instrument [Line Items]
Commitment fee (percent)					0.175%
New Credit Facilities \| Minimum \| LIBOR Rate
Debt Instrument [Line Items]
Variable rate spread (percent)					1.50%
New Credit Facilities \| Minimum \| Base Rate
Debt Instrument [Line Items]
Variable rate spread (percent)					0.50%
New Credit Facilities \| Maximum
Debt Instrument [Line Items]
Commitment fee (percent)					0.30%
New Credit Facilities \| Maximum \| LIBOR Rate
Debt Instrument [Line Items]
Variable rate spread (percent)					2.75%
New Credit Facilities \| Maximum \| Base Rate
Debt Instrument [Line Items]
Variable rate spread (percent)					1.75%
New Credit Facilities \| Term Loan
Debt Instrument [Line Items]
Face amount of instrument					$ 275,000,000.0
Term of debt instrument					5 years
Repayments of line of credit					$ 10,000,000
New Credit Facilities \| Revolving Credit Facility
Debt Instrument [Line Items]
Face amount of instrument					200,000,000.0
Debt issuance costs					4,800,000
Remaining borrowing capacity					141,600,000
Proceeds from line of credit					58,100,000
Outstanding standby letters of credit					300,000
Parsons, KS \| Municipal Bonds
Debt Instrument [Line Items]
Purchase of industrial revenue bonds			$ 9,900,000		14,200,000	9,900,000
Parsons, KS
Debt Instrument [Line Items]
Proceeds received from sale of property to be leased back			9,900,000		14,200,000
Total lease liability from assets sold			$ 9,900,000		$ 14,200,000	$ 9,900,000
Lightning Diversion Systems, Inc.
Debt Instrument [Line Items]
Purchase price, net of cash acquired	$ 60,000,000
Payments to acquire business	$ 61,400,000	$ 600,000

Shareholders' Equity (Detail) - shares	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0

Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) plan $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of incentive plans \| plan	2
Options, Granted (in shares) \| shares	129,400
Weighted-average fair value of grants (in dollars per share) \| $ / shares	$ 11.88
Outstanding at end of period, Weighted average remaining contractual term	5 years 2 months 12 days
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Granted (in shares) \| shares	129,400	123,500	73,000
Weighted-average fair value of grants (in dollars per share) \| $ / shares	$ 11.88	$ 6.53	$ 10.63
Expiration period from date of grant	7 years
Option vesting term	4 years
Aggregate intrinsic value of stock options exercised	$ 2.5	$ 1.3	$ 2.3
Cash received from the exercise of options	4.3	2.1	3.1
Tax benefits realized for the tax deductions from options exercised	$ 0.9	0.5	0.9
Options vested (in shares) \| shares	306,225
Weighted average exercise price (in dollars per share) \| $ / shares	$ 23.38
Aggregate intrinsic value	$ 1.7
Outstanding at end of period, Weighted average remaining contractual term	5 years 2 months 12 days
Share-based compensation expense	$ 0.7	0.8	1.2
Unrecognized compensation cost related to stock option	$ 1.5
Weighted average period	3 years 1 month 6 days
Total fair value of options expensed before tax benefits	$ 0.8	0.9	1.3
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vesting term	3 years
Share-based compensation expense	$ 2.0	$ 1.8	$ 1.8
Weighted average period	2 years
Awards, Granted (in shares) \| shares	135,350	139,450	108,500
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 28.97	$ 15.97	$ 25.15
Vesting percentage in year one	33.00%
Vesting percentage in year two	33.00%
Vesting percentage in year three	34.00%
Compensation not yet recognized	$ 3.0
Fair value of awards vested in period	3.0	$ 1.3	$ 1.8
Tax benefit realized on vesting of options	1.1	0.7	0.7
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 2.0	$ 0.4	$ 0.5
Weighted average period	1 year 8 months 12 days
Awards, Granted (in shares) \| shares	126,000	62,500	64,000
Weighted average grant date fair value (in dollars per share) \| $ / shares	$ 26.31	$ 15.92	$ 25.51
Compensation not yet recognized	$ 2.4
Fair value of awards vested in period	1.2	$ 1.1	$ 0.9
Tax benefit realized on vesting of options	$ 0.5	$ 0.2	$ 0.3
2007 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares) \| shares	1,200,000
Shares reserved for future issuance other than stock options \| shares	400,000
Shares reserved for future issuance \| shares	0
2013 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares) \| shares	1,040,000
Shares reserved for future issuance \| shares	77,693

Stock-Based Compensation - Option Activity (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) $ / shares shares
Number of Shares
Options, Outstanding Beginning Balance (in shares) \| shares	439,550
Options, Granted (in shares) \| shares	129,400
Options, Exercised (in shares) \| shares	(212,775)
Option, Expired (in shares) \| shares	(5,800)
Options, Forfeited (in shares) \| shares	(44,150)
Options, Outstanding Ending Balance (in shares) \| shares	306,225
Options, Exercisable at end of period (in shares) \| shares	86,425
Weighted-Average Exercise Price Per Share
Options, Beginning Balance (in dollars per share) \| $ / shares	$ 20.07
Options, Granted (in dollars per share) \| $ / shares	29.19
Options, Exercised (in dollars per share) \| $ / shares	20.38
Options, Expired, (in dollars per share) \| $ / shares	21.12
Options, Forfeited (in dollars per share) \| $ / shares	22.19
Options, Ending Balance (in dollars per share) \| $ / shares	23.38
Options, Exercisable at end of period (in dollars per share) \| $ / shares	$ 20.78
Options, Outstanding at end of period, Weighted Average Remaining Contractual Life (Years)	5 years 2 months 12 days
Options, Exercisable at end of period, Weighted Average Remaining Contractual Life (Years)	2 years 10 months 24 days
Options, Outstanding at end of period, Aggregate Intrinsic Value \| $	$ 1,654
Options, Exercisable at end of period, Aggregate Intrinsic Value \| $	$ 663

Stock-Based Compensation - Changes in Nonvested Stock Options (Details)	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Options, Nonvested, Beginning balance (shares) \| shares	225,175
Options, Nonvested, Granted (in shares) \| shares	129,400
Options, Nonvested, Vested (shares) \| shares	(90,625)
Options, Nonvested, Forfeited (shares) \| shares	(44,150)
Options, Nonvested, Ending balance (shares) \| shares	219,800
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Options, Nonvested, Weighted Average Grant Date Fair Value, Beginning balance, (in dollars per share) \| $ / shares	$ 8.77
Options, Nonvested, Weighted Average Grant Date Fair Value, Granted, (in dollars per share) \| $ / shares	11.88
Options, Nonvested, Weighted Average Grant Date Fair Value, Vested, (in dollars per share) \| $ / shares	8.87
Options, Nonvested, Weighted Average Grant Date Fair Value, Forfeited, (in dollars per share) \| $ / shares	7.93
Options, Nonvested, Weighted Average Grant Date Fair Value, Ending balance, (in dollars per share) \| $ / shares	$ 11.07

Stock-Based Compensation - Assumptions Used for Estimating Fair Value of Share Based Payment Award (Detail) - Stock Options - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate (percent)	1.75%	1.20%	1.13%
Expected volatility (percent)	50.37%	51.79%	53.72%
Expected dividends	$ 0	$ 0	$ 0
Expected term (in months)	48 months	48 months	47 months

Stock-Based Compensation - Restricted Stock Activity (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Weighted Average Grant Date Fair Value
Adjustment for target performance, Weighted Average Grant Date Fair Value (in dollars per share)	$ 25.48
Restricted Stock Units
Outstanding
Awards, Outstanding at beginning of period (in shares)	193,382
Awards, Granted (in shares)	135,350	139,450	108,500
Awards, Vested (in shares)	(101,930)
Awards, Forfeited (in shares)	(41,458)
Awards, Outstanding at ending of period (in shares)	185,344	193,382
Weighted Average Grant Date Fair Value
Outstanding at beginning of period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 18.88
Granted, Weighted Average Grant Date Fair Value (in dollars per share)	28.97	$ 15.97	$ 25.15
Vested, Weighted Average Grant Date Fair Value (in dollars per share)	19.66
Forfeited, Weighted Average Grant Date Fair Value (in dollars per share)	21.93
Outstanding at ending of period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 25.14	$ 18.88
Performance Stock Units
Outstanding
Awards, Outstanding at beginning of period (in shares)	121,637
Awards, Granted (in shares)	126,000	62,500	64,000
Adjustment for target performance (in shares)	37,350
Awards, Vested (in shares)	(43,487)
Awards, Forfeited (in shares)	(20,000)
Awards, Outstanding at ending of period (in shares)	221,500	121,637
Weighted Average Grant Date Fair Value
Outstanding at beginning of period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 20.39
Granted, Weighted Average Grant Date Fair Value (in dollars per share)	26.31	$ 15.92	$ 25.51
Vested, Weighted Average Grant Date Fair Value (in dollars per share)	24.98
Forfeited, Weighted Average Grant Date Fair Value (in dollars per share)	22.63
Outstanding at ending of period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 23.52	$ 20.39

Employee Benefit Plans - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) CompensationPlan	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of unfunded supplemental retirement plans \| CompensationPlan	3
Accumulated benefit obligations	$ 0.6	$ 0.7
Number of company sponsored 401(K) defined contribution plans \| CompensationPlan	1
Provision for matching and profit sharing contribution	$ 2.7	2.7	$ 3.2
Estimated net actuarial loss for the defined benefit pension plan	0.7
Excess of accumulated benefit obligation over fair value of plan assets	10.4
Pension liability	5.6	5.8
Estimated employer Contribution to pension plan in next fiscal year	$ 0.9
Plan One covering all employees, other than employees of Miltec
Defined Benefit Plan Disclosure [Line Items]
Contribution by employee towards defined benefit plan	25.00%
Contribution by employer towards defined benefit plan	50.00%
Employee contribution compensation limit	6.00%
Deferred Compensation Plan
Defined Benefit Plan Disclosure [Line Items]
Liability for LaBarge Deferred Compensation Plan	$ 0.1	0.6
Interest on LaBarge Deferred Compensation Plan	$ 0.7	$ 0.8
Executives and Directors
Defined Benefit Plan Disclosure [Line Items]
Number of unfunded supplemental retirement plans \| CompensationPlan	2

Employee Benefit Plans - Components of Net Periodic Pension Cost for Defined Benefit Pension Plan and Retirement Plan (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Retirement Benefits [Abstract]
Service cost	$ 531	$ 531	$ 785
Interest cost	1,329	1,367	1,350
Expected return on plan assets	(1,530)	(1,482)	(1,495)
Amortization of actuarial losses	810	762	887
Net periodic pension cost	$ 1,140	$ 1,178	$ 1,527

Employee Benefit Plans - Reclassifications from Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Retirement Benefits [Abstract]
Amortization of actuarial loss - total before tax	$ 810
Tax benefit	(302)	$ (283)	$ (330)
Net of tax	$ 508	$ 479	$ 557

Employee Benefit Plans - Obligation and Funded Status of Defined Benefit Pension Plan and Retirement Plan (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Change in benefit obligation
Benefit obligation at beginning of year	$ 33,154	$ 31,510
Service cost	531	531	$ 785
Interest cost	1,329	1,367	1,350
Actuarial loss	2,449	1,132
Benefits paid	(1,461)	(1,386)
Ending benefit obligation	36,002	33,154	31,510
Change in plan assets
Fair value of plan assets at beginning of year	22,015	19,933
Return on assets	3,481	1,551
Employer contribution	1,611	1,917
Benefits paid	(1,461)	(1,386)
Fair value of plan assets at end of year	25,646	22,015	19,933
Funded status (underfunded)	(10,356)	(11,139)
Amounts recognized in the consolidated balance sheet
Current liabilities	560	544
Non-current liabilities	9,796	10,595
Unrecognized loss included in accumulated other comprehensive loss
Unrecognized loss before tax, beginning balance	9,220	8,919
Amortization	(810)	(762)
Liability loss	2,449	1,132
Asset gain	(1,951)	(69)
Unrecognized loss before tax, ending balance	8,908	9,220	$ 8,919
Tax impact	(3,309)	(3,425)
Unrecognized loss included in accumulated other comprehensive loss, net of tax	$ 5,599	$ 5,795

Employee Benefit Plans - Pension Plan Asset Allocations (Detail)	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	100.00%	100.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	70.00%	65.00%
Cash and equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	1.00%	2.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	29.00%	33.00%

Employee Benefit Plans - Asset Allocation Ranges (Detail)	Dec. 31, 2017
Minimum \| Cash
Defined Benefit Plan Disclosure [Line Items]
Minimum %	0.00%
Minimum \| Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Minimum %	15.00%
Minimum \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Minimum %	30.00%
Maximum \| Cash
Defined Benefit Plan Disclosure [Line Items]
Minimum %	5.00%
Maximum \| Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Minimum %	75.00%
Maximum \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Minimum %	80.00%

Employee Benefit Plans - Return on Current and Target Asset Allocation (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	$ 25,646	$ 22,015	$ 19,933
Total fair value of plan assets, not including pooled funds	6,164	6,205
Pooled funds	19,482	15,810
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	135	366
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	3,494	3,468
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	1,625	1,611
Other Investments
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	910	760
Level 1
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets, not including pooled funds	6,164	6,205
Level 1 \| Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	135	366
Level 1 \| Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	3,494	3,468
Level 1 \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	1,625	1,611
Level 1 \| Other Investments
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	910	760
Level 2
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets, not including pooled funds	0	0
Level 2 \| Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Level 2 \| Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Level 2 \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Level 2 \| Other Investments
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Level 3
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets, not including pooled funds	0	0
Level 3 \| Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Level 3 \| Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Level 3 \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	0	0
Level 3 \| Other Investments
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	$ 0	$ 0

Employee Benefit Plans - Weighted-average Assumptions Used to Determine Benefit Obligations (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Plan
Discount rate used to determine pension expense :
Discount rate	4.18%	4.55%	4.25%
Discount rate used to determine value of obligations
Discount rate	3.64%	4.18%	4.55%
Long term rate of return	7.00%	7.50%	7.50%
Retirement Plan \| La Barge
Discount rate used to determine pension expense :
Discount rate	3.75%	4.00%	3.70%
Discount rate used to determine value of obligations
Discount rate	3.40%	3.75%	4.00%

Employee Benefit Plans - Future Benefit Payments Under Pension Plans (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Pension Plan
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2018	$ 1,178
2019	1,212
2020	1,288
2021	1,365
2022	1,453
2023 - 2027	8,246
Retirement Plan \| La Barge
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2018	561
2019	546
2020	528
2021	506
2022	482
2023 - 2027	$ 2,022

Leases - Rental Payments Under Operating Lease (Detail) $ in Thousands	Dec. 31, 2017 USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2018	$ 3,586
2019	2,793
2020	2,554
2021	1,927
2022	947
Thereafter	553
Total	$ 12,360

Income Taxes - Schedule of Components of Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current tax expense (benefit)
Federal									$ 2,387	$ 5,953	$ (1,511)
State									525	2,982	(418)
Current Income Tax Expense (Benefit), Total									2,912	8,935	(1,929)
Deferred tax (benefit) expense
Federal									(15,515)	3,876	(28,011)
State									135	41	(1,771)
Deferred Income Tax (Benefit) Expense, Total									(15,380)	3,917	(29,782)
Income tax (benefit) expense	$ (14,541)	$ 940	$ 741	$ 392	$ 2,989	$ 1,234	$ 1,470	$ 7,159	$ (12,468)	$ 12,852	$ (31,711)

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Tax Credit Carryforward [Line Items]
Tax Cuts and Jobs Act of 2017, tax benefit	$ 13,000
Excess tax benefit over compensation cost recognized, amount	600
Excess tax (benefits) or shortfall from share-based compensation		$ (80)	$ 626
Operating loss carryforward not expected to be realized under ASC subtopic 740-10	1,300
Tax credit carryforwards	5,613	4,234
Tax credit carryforwards valuation allowance	9,013	6,607
Permanent book to tax difference from goodwill impairment			8,700
Unrecognized tax benefits	5,271	$ 3,036	$ 2,963	$ 2,803
Unrecognized tax benefits that would impact effective tax rate	3,400
State
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	1,800
Tax credit carryforwards	12,800
Tax credit carryforwards valuation allowance	11,300
Federal
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	$ 6,600

Income Taxes - Schedule of Deferred Income Taxes (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Accrued expenses	$ 313	$ 760
Allowance for doubtful accounts	208	184
Contract overrun reserves	294	1,776
Deferred compensation	177	507
Employment-related accruals	2,091	2,888
Environmental reserves	501	769
Federal tax credit carryforwards	5,613	4,234
Inventory reserves	1,315	2,313
Pension obligation	2,398	4,002
State net operating loss carryforwards	86	63
State tax credit carryforwards	9,051	6,585
Stock-based compensation	1,480	1,950
Workers’ compensation	75	122
Other	1,492	2,098
Total gross deferred tax assets	25,094	28,251
Valuation allowance	(9,013)	(6,607)
Total gross deferred tax assets, net of valuation allowance	16,081	21,644
Deferred tax liabilities:
Depreciation	(7,976)	(13,167)
Goodwill	(2,902)	(3,909)
Intangibles	(20,611)	(35,071)
Prepaid insurance	(312)	(626)
Unbilled receivables	0	(2)
Total gross deferred tax liabilities	(31,801)	(52,775)
Net deferred tax liabilities	$ (15,720)	$ (31,131)

Income Taxes - Variation Between Expected and Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Statutory federal income tax (benefit) rate	35.00%	35.00%	35.00%
State income taxes (net of federal benefit)	2.50%	5.70%	1.20%
Qualified domestic production activities	(2.60%)	(2.00%)	(0.50%)
Stock-based compensation expense	(8.20%)	0.00%	0.00%
Research and development tax credits	(50.60%)	(8.60%)	2.90%
Other tax credits	(7.50%)	(0.00%)	(0.00%)
Goodwill impairment	0.00%	0.00%	(8.10%)
Changes in valuation allowance	10.60%	0.90%	(0.60%)
Non-deductible book expenses	1.10%	0.20%	(0.20%)
Changes in deferred tax assets	15.40%	1.50%	(0.10%)
Re-measurement of deferred taxes for 2017 Tax Act	(171.30%)	0.00%	0.00%
Changes in tax reserves	11.40%	0.00%	(0.10%)
Other	0.40%	1.00%	0.20%
Effective income tax (benefit) rate	(163.80%)	33.70%	29.70%

Income Taxes - Schedule of Changes in Unrecognized Tax Benefit (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	$ 3,036	$ 2,963	$ 2,803
Additions for tax positions related to the current year	422	476	702
Additions for tax positions related to prior years	1,953	385	0
Reductions for tax positions related to prior years	(99)	(567)	(48)
Reductions for lapse of statute of limitations	(41)	(221)	(494)
Ending Balance	$ 5,271	$ 3,036	$ 2,963

Contingencies (Detail) - Ducommun AeroStructures $ in Millions	Dec. 31, 2017 USD ($)
El Mirage and Monrovia, California
Loss Contingencies [Line Items]
Reserve for estimated liability	$ 1.5
Casmalia and West Covina, California
Loss Contingencies [Line Items]
Reserve for estimated liability	0.4
Minimum \| Casmalia and West Covina, California
Loss Contingencies [Line Items]
Estimate of possible loss	0.4
Maximum \| Casmalia and West Covina, California
Loss Contingencies [Line Items]
Estimate of possible loss	$ 3.1

Major Customers and Concentrations of Credit Risk - Sales to Major Customers (Detail) - Customer Concentration Risk - Sales Revenue, Net	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Boeing
Revenue, Major Customer [Line Items]
Concentration percentage	16.40%	17.30%	16.00%
Lockheed Martin
Revenue, Major Customer [Line Items]
Concentration percentage	5.50%	5.60%	1.20%
Raytheon
Revenue, Major Customer [Line Items]
Concentration percentage	13.50%	8.40%	8.70%
Spirit
Revenue, Major Customer [Line Items]
Concentration percentage	8.20%	8.20%	7.40%
United Technologies
Revenue, Major Customer [Line Items]
Concentration percentage	4.70%	5.30%	6.10%
Top Ten Customers
Revenue, Major Customer [Line Items]
Concentration percentage	62.50%	58.60%	55.70%

Major Customers and Concentrations of Credit Risk - Receivables from Customers (Detail) - Customer Concentration Risk - Accounts Receivable	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Boeing
Concentration Risk [Line Items]
Concentration percentage	7.80%	7.80%
Lockheed Martin
Concentration Risk [Line Items]
Concentration percentage	5.90%	2.90%
Raytheon
Concentration Risk [Line Items]
Concentration percentage	1.40%	10.90%
Spirit
Concentration Risk [Line Items]
Concentration percentage	13.50%	9.00%
United Technologies
Concentration Risk [Line Items]
Concentration percentage	2.30%	7.80%

Major Customers and Concentrations of Credit Risk - Additional Information (Detail) - Foreign Customers Worldwide - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Concentration Risk [Line Items]
Revenues	$ 57.2	$ 56.4	$ 60.2
Maximum
Concentration Risk [Line Items]
Percentage of sales	3.00%	3.00%	3.00%

Business Segment Information - Additional Information (Detail) $ in Thousands		12 Months Ended
	Sep. 11, 2017 USD ($)	Dec. 31, 2017 USD ($) Segment	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2017
Segment Reporting [Abstract]
Number of reportable segments \| Segment		2
Segment Reporting Information [Line Items]
Purchase price, net of cash acquired		$ 59,798	$ 0	$ 0
Lightning Diversion Systems, Inc.
Segment Reporting Information [Line Items]
Equity interest acquired	100.00%				100.00%
Purchase price, net of cash acquired	$ 60,000
Gross purchase price	$ 62,021

Business Segment Information - Financial Information by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net Revenues	$ 142,258	$ 138,690	$ 140,938	$ 136,297	$ 142,486	$ 132,571	$ 133,437	$ 142,148	$ 558,183	$ 550,642	$ 666,011
Segment Operating Income (Loss)									36,417	45,480	(57,482)
Corporate General and Administrative Expenses									(21,392)	(16,912)	(17,827)
Operating Income (Loss)									15,025	28,568	(75,309)
Depreciation and amortization									22,845	22,860	26,846
Capital Expenditures									26,473	18,693	15,988
Operating Segments \| Structural Systems
Segment Reporting Information [Line Items]
Net Revenues									241,460	246,465	273,319
Segment Operating Income (Loss)									5,477	16,497	(53,010)
Depreciation and amortization									8,860	8,688	9,417
Capital Expenditures									20,679	15,661	11,559
Operating Segments \| Electronic Systems
Segment Reporting Information [Line Items]
Net Revenues									316,723	304,177	392,692
Segment Operating Income (Loss)									30,940	28,983	(4,472)
Depreciation and amortization									13,888	14,087	17,267
Capital Expenditures									5,019	3,032	4,419
Corporate Administration
Segment Reporting Information [Line Items]
Depreciation and amortization									97	85	162
Capital Expenditures									$ 775	$ 0	$ 10

Business Segment Information - Segment Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Total Assets	$ 566,753	$ 515,429
Goodwill and Intangibles	232,128	184,127
Operating Segments \| Structural Systems
Segment Reporting Information [Line Items]
Total Assets	193,600	175,580
Goodwill and Intangibles	2,836	3,745
Operating Segments \| Electronic Systems
Segment Reporting Information [Line Items]
Total Assets	362,831	325,780
Goodwill and Intangibles	229,292	180,382
Corporate Administration
Segment Reporting Information [Line Items]
Total Assets	$ 10,322	$ 14,069

Supplemental Quarterly Financial Data (Unaudited) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Net Revenues	$ 142,258	$ 138,690	$ 140,938	$ 136,297	$ 142,486	$ 132,571	$ 133,437	$ 142,148	$ 558,183	$ 550,642	$ 666,011
Gross Profit	25,693	26,009	26,191	24,927	27,786	25,223	26,215	26,969	102,820	106,193	100,792
(Loss) Income Before Taxes	(5,057)	5,595	4,564	2,507	5,825	6,248	5,331	20,709	7,609	38,113	(106,590)
Income Tax (Benefit) Expense	(14,541)	940	741	392	2,989	1,234	1,470	7,159	(12,468)	12,852	(31,711)
Net Income	$ 9,484	$ 4,655	$ 3,823	$ 2,115	$ 2,836	$ 5,014	$ 3,861	$ 13,550	$ 20,077	$ 25,261	$ (74,879)
Earnings Per Share
Basic earnings (loss) per share (in dollars per share)	$ 0.84	$ 0.41	$ 0.34	$ 0.19	$ 0.25	$ 0.45	$ 0.35	$ 1.22	$ 1.78	$ 2.27	$ (6.78)
Diluted earnings (loss) per share (in dollars per share)	$ 0.82	$ 0.41	$ 0.33	$ 0.18	$ 0.25	$ 0.44	$ 0.34	$ 1.21	$ 1.74	$ 2.24	$ (6.78)

Supplemental Quarterly Financial Data (Unaudited) - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2017	Apr. 02, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 11, 2017
Segment Reporting Information [Line Items]
Tax Cuts and Jobs Act of 2017, provisional income tax benefit	$ 13,000
Restructuring Charges	8,800		$ 8,360	$ 182	$ 2,125
Pittsburgh and Miltec Operations [Member]
Segment Reporting Information [Line Items]
Gain (loss) on disposition of assets		$ 18,800
Lightning Diversion Systems, Inc.
Segment Reporting Information [Line Items]
Equity interest acquired						100.00%	100.00%
Cost of Sales
Segment Reporting Information [Line Items]
Restructuring Charges	$ 500

Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 495	$ 359	$ 252
Additions Charged to Costs and Expenses	334	233	235
Deductions/(Recoveries)	(39)	97	128
Balance at End of Period	868	495	359
Valuation Allowance of Deferred Tax Assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	6,607	7,477	6,882
Additions Charged to Costs and Expenses	2,406	(870)	595
Deductions/(Recoveries)	0	0	0
Balance at End of Period	$ 9,013	$ 6,607	$ 7,477

Shareholders' Equity	12 Months Ended
Shareholders' Equity	Dec. 31, 2017
Equity [Abstract]
Shareholders' Equity	Shareholders’ Equity We are authorized to issue five million shares of preferred stock. At December 31, 2017 and 2016, no preferred shares were issued or outstanding.