Ducommun (DCO) 10-K 28 Feb 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Feb. 14, 2019	Jun. 30, 2018
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Trading Symbol	DCO
Entity Registrant Name	DUCOMMUN INC /DE/
Entity Central Index Key	30,305
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		11,425,954
Entity Public Float			$ 377

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current Assets
Cash and cash equivalents	$ 10,263		$ 2,150	$ 7,432	$ 5,454
Accounts receivable (less allowance for doubtful accounts of $1,135 and $868 at December 31, 2018 and 2017, respectively)	67,819		74,064
Contract assets	86,665	$ 68,739	0
Inventories	101,125	83,159	122,161
Production cost of contracts	11,679		11,204
Other current assets	9,839		11,435
Total Current Assets	287,390		221,014
Property and Equipment, Net	107,045		110,252
Goodwill	136,057		117,435
Intangibles, Net	112,092		114,693
Non-Current Deferred Income Taxes	308	166	261
Other Assets	5,251		3,098
Total Assets	648,143		566,753
Current Liabilities
Accounts payable	69,274		51,907
Contract liabilities	17,145	24,460	0
Accrued liabilities	37,786	22,238	28,329
Current portion of long-term debt	2,330		0
Total Current Liabilities	126,535		80,236
Long-Term Debt, Less Current Portion	226,961		216,055
Non-Current Deferred Income Taxes	18,070	18,589	15,981
Other Long-Term Liabilities	19,752		18,898
Total Liabilities	391,318		331,170
Commitments and Contingencies (Notes 13, 16)
Shareholders’ Equity
Common stock - $0.01 par value; 35,000,000 shares authorized; 11,417,863 and 11,332,841 shares issued and outstanding at December 31, 2018 and 2017, respectively	114		113
Additional paid-in capital	83,712		80,223
Retained earnings	180,356	$ 170,029	161,364
Accumulated other comprehensive loss	(7,357)		(6,117)
Total Shareholders’ Equity	256,825		235,583	$ 212,103	$ 185,734
Total Liabilities and Shareholders’ Equity	$ 648,143		$ 566,753

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 1,135	$ 868
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	35,000,000	35,000,000
Common stock, shares issued (in shares)	11,417,863	11,332,841
Common Stock, shares outstanding (in shares)	11,417,863	11,332,841

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement [Abstract]
Net Revenues	$ 164,183	$ 159,842	$ 154,827	$ 150,455	$ 142,258	$ 138,690	$ 140,938	$ 136,297	$ 629,307	$ 558,183	$ 550,642
Cost of Sales									506,711	455,050	444,102
Gross Profit	32,697	31,116	32,028	26,755	25,772	26,087	26,269	25,005	122,596	103,133	106,540
Selling, General and Administrative Expenses									84,007	79,139	77,142
Restructuring Charges	3,800	3,400	5,400	2,200	8,800				14,671	8,360	182
Operating Income									23,918	15,634	29,216
Interest Expense									(13,024)	(8,870)	(8,922)
Gain on Divestitures, Net									0	0	17,604
Loss on Extinguishment of Debt									(926)	0	0
Other Income, Net									303	845	215
Income Before Taxes	1,791	4,290	1,833	2,357	(5,057)	5,595	4,564	2,507	10,271	7,609	38,113
Income Tax Expense (Benefit)	1,118	119	242	(243)	(14,541)	940	741	392	1,236	(12,468)	12,852
Net Income	$ 673	$ 4,171	$ 1,591	$ 2,600	$ 9,484	$ 4,655	$ 3,823	$ 2,115	$ 9,035	$ 20,077	$ 25,261
Earnings Per Share
Basic earnings (loss) per share (in dollars per share)	$ 0.06	$ 0.37	$ 0.14	$ 0.23	$ 0.84	$ 0.41	$ 0.34	$ 0.19	$ 0.79	$ 1.78	$ 2.27
Diluted earnings (loss) per share (in dollars per share)	$ 0.06	$ 0.36	$ 0.14	$ 0.22	$ 0.82	$ 0.41	$ 0.33	$ 0.18	$ 0.77	$ 1.74	$ 2.24
Weighted-Average Number of Shares Outstanding
Basic (in shares)									11,390	11,290	11,151
Diluted (in shares)									11,659	11,558	11,299

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net Income	$ 673	$ 4,171	$ 1,591	$ 2,600	$ 9,484	$ 4,655	$ 3,823	$ 2,115	$ 9,035	$ 20,077	$ 25,261
Pension Adjustments:
Amortization of actuarial losses included in net income, net of tax benefit of $173, $302, and $283 for 2018, 2017, and 2016, respectively									570	508	479
Actuarial losses arising during the period, net of tax benefit of $302, $194, and $413 for 2018, 2017, and 2016, respectively									(899)	(304)	(650)
Change in net unrealized gains (losses) on cash flow hedges, net of tax expense (benefit) of $121, $(145), and $(180) for 2018, 2017, and 2016, respectively									407	(242)	(305)
Other Comprehensive (Loss) Income, Net of Tax									78	(38)	(476)
Comprehensive Income, Net of Tax									$ 9,113	$ 20,039	$ 24,785

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Amortization of actuarial (loss) gain, tax	$ 173	$ 302	$ 283
Actuarial gain (loss) arising during the period, tax expense (benefit)	302	194	413
Unrealized gain (loss) on cash flow hedges, tax	$ 121	$ (145)	$ (180)

Consolidated Statements of Chan

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, 2015		11,084,318
Beginning 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
Stock options exercised	4,336	$ 2		4,334
Stock repurchased related to the exercise of stock options (in shares)		(219,164)
Stock repurchased related to the exercise of stock options	(6,904)	$ (2)		(6,902)
Stock awards vested (in shares)		145,417
Stock awards vested	0	$ 1		(1)
Stock-based compensation	6,009			6,009
Ending Balance (in shares) at Dec. 31, 2017		11,332,841
Ending Balance at Dec. 31, 2017	235,583	$ 113	0	80,223	161,364	(6,117)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	9,035				9,035
Other comprehensive income (loss), net of tax	78					78
Adoption of ASU 2018-02 adjustment	$ (26)				1,292	(1,318)
Stock options exercised (in shares)	84,800	84,800
Stock options exercised	$ 1,822	$ 1		1,821
Stock repurchased related to the exercise of stock options (in shares)		(98,438)
Stock repurchased related to the exercise of stock options	(6,345)	$ (1)		(6,344)
Stock awards vested (in shares)		98,660
Stock awards vested	2,973	$ 1		2,972
Stock-based compensation	5,040			5,040
Ending Balance (in shares) at Dec. 31, 2018		11,417,863
Ending Balance at Dec. 31, 2018	$ 256,825	$ 114	$ 0	$ 83,712	$ 180,356	$ (7,357)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows from Operating Activities
Net Income	$ 9,035	$ 20,077	$ 25,261
Adjustments to Reconcile Net Income (Loss) to Net Cash Provided by Operating Activities
Depreciation and amortization	25,296	22,845	22,860
Gain on divestitures, net	0	0	(17,604)
Property and equipment impairment due to restructuring	6,207	3,607	0
Stock-based compensation expense	5,040	4,675	3,007
Deferred income taxes	2,042	(15,411)	3,519
Excess tax benefits from stock-based compensation	0	0	(248)
Provision for doubtful accounts	267	373	112
Noncash loss on extinguishment of debt	926	0	0
Other	11,659	(1,182)	(7,204)
Changes in Assets and Liabilities:
Accounts receivable	7,495	2,720	3,220
Contract assets	(86,665)	0	0
Inventories	23,243	(533)	(5,182)
Production cost of contracts	(1,569)	(267)	(1,536)
Other assets	1,881	40	2,974
Accounts payable	18,496	(4,015)	15,055
Contract liabilities	17,145	0	0
Accrued and other liabilities	5,739	2,505	(966)
Net Cash Provided by Operating Activities	46,237	35,434	43,268
Cash Flows from Investing Activities
Purchases of property and equipment	(17,617)	(27,610)	(17,001)
Proceeds from sale of assets	396	913	16
Insurance recoveries related to property and equipment	0	288	0
Proceeds from divestitures	0	0	51,893
Payments for acquisition of Lightning Diversion Systems, LLC, net of cash acquired	0	(59,798)	0
Payments for acquisition of Certified Thermoplastics Co., LLC, net of cash acquired	(30,712)	0	0
Net Cash (Used in) Provided by Investing Activities	(47,933)	(86,207)	34,908
Cash Flows from Financing Activities
Borrowings from senior secured revolving credit facility	296,400	395,900	71,800
Repayment of senior secured revolving credit facility	(354,500)	(337,800)	(71,800)
Borrowings from term loan	240,000	0	0
Repayments of term loan	(167,000)	(10,000)	(75,000)
Repayments of other debt	0	(3)	(23)
Debt issuance costs	(3,541)	0	0
Excess tax benefits from stock-based compensation	0	0	248
Net cash paid from issuance of common stock under stock plans	(1,550)	(2,606)	(1,423)
Net Cash Provided by (Used in) Financing Activities	9,809	45,491	(76,198)
Net (Decrease) Increase in Cash and Cash Equivalents	8,113	(5,282)	1,978
Cash and Cash Equivalents at Beginning of Year	2,150	7,432	5,454
Cash and Cash Equivalents at End of Year	$ 10,263	$ 2,150	$ 7,432

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Description of Business We are a leading global provider of engineering and manufacturing services for high-performance products and high-cost-of failure applications used primarily in the aerospace and defense (“A&D”), industrial, medical, and other industries (collectively, “Industrial”). Our operations are organized into two primary businesses: Electronic Systems segment and Structural Systems segment, each of which is a reportable operating segment. Electronic Systems designs, engineers and manufactures high-reliability electronic and electromechanical products used in worldwide technology-driven markets including A&D and Industrial end-use markets. Electronic Systems’ product offerings primarily range from prototype development to complex assemblies. Structural Systems designs, engineers and manufactures large, complex contoured aerostructure components and assemblies and supplies composite and metal bonded structures and assemblies. Structural Systems’ products are primarily used on commercial aircraft, military fixed-wing aircraft and military and commercial rotary-wing aircraft. All reportable operating segments follow the same accounting principles. Basis of Presentation The consolidated financial statements include the accounts of Ducommun Incorporated and its subsidiaries (“Ducommun,” the “Company,” “we,” “us” or “our”), after eliminating intercompany balances and transactions. In the opinion of management, all adjustments, consisting of recurring accruals, have been made that are necessary to fairly state our consolidated financial position, statements of income, comprehensive income, and cash flows in accordance with accounting principles generally accepted in the United States of America (“GAAP”). Our fiscal quarters typically end on the Saturday closest to the end of March, June and September for the first three fiscal quarters of each year, and ends on December 31 for our fourth fiscal quarter. As a result of using fiscal quarters for the first three quarters combined with leap years, our first and fourth fiscal quarters can range between 12 1/2 weeks to 13 1/2 weeks while the second and third fiscal quarters remain at a constant 13 weeks per fiscal quarter. Changes in Accounting Policies We adopted ASC 606, “Revenue from Contracts with Customers” (“ASC 606”), on January 1, 2018. As a result, we changed our accounting policy for revenue recognition as detailed below and in Note 2, as well as other accounting policies as noted below. We applied ASC 606 using the modified retrospective method (also known as the cumulative effect method) and therefore, recognized the cumulative effect of initially applying ASC 606 as an adjustment to the opening consolidated balance sheet at January 1, 2018. Therefore, the comparative information has not been adjusted and continues to be reported under the previous revenue recognition accounting standard, ASC 605, “Revenue Recognition” (“ASC 605”). The details of the significant changes and quantitative impact of the changes are described below and in Note 2. 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, 2018 2017 2016 Interest paid $ 11,573 $ 7,307 $ 6,877 Taxes paid $ 316 $ 3,125 $ 9,778 Non-cash activities: Purchases of property and equipment not paid $ 824 $ 2,104 $ 3,241 Fair Value Assets and liabilities that are measured, recorded or disclosed at fair value on a recurring basis are categorized using the fair value hierarchy. The fair value hierarchy has three levels based on the reliability of the inputs used to determine the fair value. Level 1, the highest level, refers to the values determined based on quoted prices in active markets for identical assets. Level 2 refers to fair values estimated using significant observable inputs. Level 3, the lowest level, includes fair values estimated using significant unobservable inputs. We have money market funds and they are included as cash and cash equivalents. We also have interest rate cap hedge agreements and the fair value of the interest rate cap hedge agreements were determined using pricing models that use observable market inputs as of the balance sheet date, a Level 2 measurement. The interest rate cap hedge premium of $0.3 million is included as other current assets and other assets. There were no transfers between Level 1, Level 2, or Level 3 financial instruments in either 2018 or 2017. 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, 2018 and December 31, 2017, all of our derivative instruments were designated as cash flow hedges. We record changes in the fair value of a derivative instrument that is highly effective and that is designated and qualifies as a cash flow hedge in other comprehensive income (loss), net of tax until our earnings are affected by the variability of cash flows of the underlying hedge. We record any hedge ineffectiveness and amounts excluded from effectiveness testing in current period earnings within interest expense. We report changes in the fair values of derivative instruments that are not designated or do not qualify for hedge accounting in current period earnings. We classify cash flows from derivative instruments in the consolidated statements of cash flows in the same category as the item being hedged or on a basis consistent with the nature of the instrument. In 2018, we recorded the changes in the fair value of the derivative instruments that were highly effective and that was designated and qualified as cash flow hedges in other comprehensive income (loss), net of tax, of $0.4 million . Since a portion of our cash flow hedges mature on a quarterly basis, $0.3 million of realized loss was recorded in the consolidated statements of income in 2018. When we determine that a derivative instrument is not highly effective as a hedge, we discontinue hedge accounting prospectively. In all situations in which we discontinue hedge accounting and the derivative instrument remains outstanding, we will carry the derivative instrument at its fair value on our consolidated balance sheets and recognize subsequent changes in its fair value in our current period earnings. Allowance for Doubtful Accounts We maintain an allowance for doubtful accounts for estimated losses from the inability of customers to make required payments. The allowance for doubtful accounts is evaluated periodically based on the aging of accounts receivable, the financial condition of customers and their payment history, historical write-off experience and other assumptions, such as current assessment of economic conditions. Inventories Inventories are stated at the lower of cost or net realizable value with cost being determined using a moving average cost basis for raw materials and actual cost for work-in-process and finished goods. The majority of our inventory is charged to cost of sales as raw materials are placed into production and the related revenue is recognized. Inventoried costs include raw materials, outside processing, direct labor and allocated overhead, adjusted for any abnormal amounts of idle facility expense, freight, handling costs, and wasted materials (spoilage) incurred. We assess the inventory carrying value and reduce it, if necessary, to its net realizable value based on customer orders on hand, and internal demand forecasts using management’s best estimates given information currently available. As a result of adopting ASC 606 on January 1, 2018, where we utilized the modified retrospective method of adoption and we changed our revenue recognition for the majority of our revenue from point in time to over time, our inventory balance decreased significantly. For revenue contracts where revenue is recognized using the point in time method, inventory is not reduced until it is shipped or transfer of control to the customer has occurred. Our ending inventory consists of raw materials, work-in-process, and finished goods. See Note 2. Production Cost of Contracts Production cost of contracts includes non-recurring production costs, such as design and engineering costs, and tooling and other special-purpose machinery necessary to build parts as specified in a contract. Production costs of contracts are recorded to cost of sales using the over time revenue recognition model. We review the value of the production cost of contracts on a quarterly basis to ensure when added to the estimated cost to complete, the value is not greater than the estimated realizable value of the related contracts. As of December 31, 2018 and 2017 , production costs of contracts were $11.7 million and $11.2 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 Goodwill is evaluated for impairment on an annual basis on the first day of the fourth fiscal quarter. If certain factors occur, including significant under performance of our business relative to expected operating results, significant adverse economic and industry trends, significant decline in our market capitalization for an extended period of time relative to net book value, a decision to divest individual businesses within a reporting unit, or a decision to group individual businesses differently, we may perform an impairment test prior to the fourth quarter. In the fourth quarter of 2018, the carrying amount of goodwill at the date of the most recent annual impairment evaluation for Electronic Systems and Structural Systems was $117.5 million and $18.6 million , respectively. As of the date of our 2018 annual evaluation for goodwill impairment, we used a qualitative assessment including 1) margin of passing most recent step 1 analysis, 2) earnings before interest, taxes, depreciation, and amortization, 3) long-term growth rate, 4) analyzing material adverse factors/changes between valuation dates, 5) general macroeconomic factors, and 6) industry and market conditions, noting it was not more likely than not that the fair value of a reporting unit is less than its carrying amount and thus, goodwill was not deemed impaired. Other Intangible Assets We amortize acquired other intangible assets with finite lives over the estimated economic lives of the assets, ranging from 10 to 18 years generally using the straight-line method. The value of other intangibles acquired through business combinations has been estimated using present value techniques which involve estimates of future cash flows. We evaluate other intangible assets for recoverability considering undiscounted cash flows, when significant changes in conditions occur, and recognize impairment losses, if any, based upon the estimated fair value of the assets. Accumulated Other Comprehensive Loss Accumulated other comprehensive loss, as reflected on the consolidated balance sheets under the equity section, was comprised of cumulative pension and retirement liability adjustments, net of tax, and change in net unrealized gains and losses on cash flow hedges, net of tax. Revenue Recognition Our customers typically engage us to manufacture products based on designs and specifications provided by the end-use customer. This will require the building of tooling and manufacturing first article inspection products (prototypes) before volume manufacturing. Contracts with our customers generally include a termination for convenience clause. We have a significant number of contracts that are started and completed within the same year, as well as contracts derived from long-term agreements and programs that can span several years. We recognize revenue under ASC 606, which utilizes a five-step model. Further, we utilized the modified retrospective method (also known as the cumulative effect method) of adoption of ASC 606. See Note 2. The definition of a contract under ASC 606 for us is typically defined as a customer purchase order as this is when we achieve enforceable right to payment. The majority of our contracts are firm fixed-price contracts. The deliverables within a customer purchase order are analyzed to determine the number of performance obligations. In addition, at times, in order to achieve economies of scale and based on our customer’s forecasted demand, we may build in advance of receiving a purchase order from our customers and in which case, we would not recognize revenue until we have received the customer purchase order. A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account under ASC 606. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. The majority of our contracts have a single performance obligation as the promise to transfer the individual goods or services are highly interrelated or met the Series guidance. For contracts with multiple performance obligations, we allocate the contract transaction price to each performance obligation using our best estimate of the standalone selling price of each distinct good or service in the contract. The primary method used to estimate the standalone selling price is the expected cost plus a margin approach, under which we forecast our expected costs of satisfying a performance obligation and then add an appropriate margin for that distinct good or service. The majority of our performance obligations are satisfied over time as work progresses. Typically, revenue is recognized over time using an input measure (i.e., costs incurred to date relative to total estimated costs at completion, also known as cost-to-cost plus reasonable profit) to measure progress. Our typical revenue contract is a firm fixed price contract, and the cost of raw materials could make up a significant amount of the total costs incurred. As such, we believe using the total costs incurred input method would be the most appropriate method. While the cost of raw materials could make up a significant amount of the total costs incurred, there is a direct relationship between our inputs and the transfer of control of goods or services to the customer as in the event the customer invokes the termination for convenience clause, we would be entitled to costs incurred to date plus a reasonable profit. The majority of our revenues are recognized over time. Contract costs typically include labor, materials, and overhead. Contract estimates are based on various assumptions to project the outcome of future events that can span multiple months or years. These assumptions include labor productivity and availability; the complexity of the work to be performed; the cost and availability of materials; and the performance of subcontractors. As a significant change in one or more of these estimates could affect the profitability of our contracts, we review and update our contract-related estimates on a regular basis. We recognize adjustments in estimated profit on contracts under the cumulative catch-up method. Under this method, the impact of the adjustment on profit recorded to date is recognized in the period the adjustment is identified. Revenue and profit in future periods of contract performance is recognized using the adjusted estimate. If at any time the estimate of contract profitability indicates an anticipated loss on the contract, we recognize the total loss in the quarter it is identified. The impact of adjustments in contract estimates on our operating earnings can be reflected in either operating costs and expenses or revenue. Net cumulative catch-up adjustments on profit recorded to date were not material for the year ended December 31, 2018. Payments under long-term contracts may be received before or after revenue is recognized. When revenue is recognized before we bill our customer, a contract asset is created for the work performed but not yet billed. Similarly, when we receive payment before we ship our products to our customer, a contract liability is created for the advance or progress payment. Contract Assets and Contract Liabilities Contract assets consist of our right to payment for work performed but not yet billed. Contract assets are transferred to accounts receivable when we ship the products to our customers and meet the shipping terms within the revenue contract. Contract liabilities consist of advance or progress payments received from our customers prior to the time transfer of control occurs plus the estimated losses on contracts. Contract assets and contract liabilities from revenue contracts with customers are as follows: (In thousands) December 31, December 31, Contract assets $ 86,665 $ — Contract liabilities $ 17,145 $ — Remaining performance obligations is defined as customer placed purchase orders (“POs”) with firm fixed price and firm delivery dates. Our remaining performance obligations as of December 31, 2018 totaled $722.8 million . We anticipate recognizing an estimated 70% of our remaining performance obligations as revenue during the next 12 months with the remaining performance obligations being recognized in 2020 and beyond. Revenue by Category In addition to the revenue categories disclosed above, the following table reflects our revenue disaggregated by major end-use market: (In thousands) Years Ended December 31, % of Net Revenues Change 2018 2017 2018 2017 Consolidated Ducommun Military and space $ 8,901 $ 276,659 $ 267,758 44.0 % 48.0 % Commercial aerospace 68,101 304,455 236,354 48.4 % 42.3 % Industrial (5,878 ) 48,193 54,071 7.6 % 9.7 % Total $ 71,124 $ 629,307 $ 558,183 100.0 % 100.0 % Electronic Systems Military and space $ 3,684 $ 214,786 $ 211,102 63.6 % 66.6 % Commercial aerospace 23,339 74,889 51,550 22.2 % 16.3 % Industrial (5,878 ) 48,193 54,071 14.2 % 17.1 % Total $ 21,145 $ 337,868 $ 316,723 100.0 % 100.0 % Structural Systems Military and space $ 5,217 $ 61,873 $ 56,656 21.2 % 23.5 % Commercial aerospace 44,762 229,566 184,804 78.8 % 76.5 % Total $ 49,979 $ 291,439 $ 241,460 100.0 % 100.0 % Provision for Estimated Losses on Contracts We record provisions for the total anticipated losses on contracts, considering total estimated costs to complete the contract compared to total anticipated revenues, in the period in which such losses are identified. The provisions for estimated losses on contracts require us to make certain estimates and assumptions, including those with respect to the future revenue under a contract and the future cost to complete the contract. Our estimate of the future cost to complete a contract may include assumptions as to changes in manufacturing efficiency, operating and material costs, and our ability to resolve claims and assertions with our customers. If any of these or other assumptions and estimates do not materialize in the future, we may be required to adjust the provisions for estimated losses on contracts. As a result of the adoption of ASC 606 on January 1, 2018, the definition of a revenue contract with a customer for us now has changed and is typically defined as a customer purchase order. As such, in certain scenarios such as at the inception of a long-term agreement where our customer may be issuing purchase orders over the duration of the long-term agreement, we may be required to recognize anticipated losses on some of these contracts that would not have occurred under ASC 605. In addition, provision for estimated losses on contracts are now included as part of contract liabilities on the consolidated balance sheets. 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. 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 United States (“U.S.”) enacted the Tax Cuts and Jobs Act (the “2017 Tax Act”). The 2017 Tax Act represented major tax reform legislation that, among other provisions, reduced the U.S. corporate tax rate from 35.0% to 21.0% effective January 1, 2018. In our consolidated financial statements included in our 2017 Annual Report on Form 10-K, we recognized provisional amounts for the income tax effects of the 2017 Tax Act which included $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 in accordance with SEC Staff Accounting Bulletin No. 118 (“SAB 118”). SAB 118 provided 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 and allowed a measurement period to make refinements and finalize the tax effects not exceed one year from the enactment date. During the fourth quarter of 2018, we finalized our accounting for the tax effects of the 2017 Tax Act. See Note 15 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 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 and weighted-average number of common shares outstanding used to compute earnings per share were as follows: (In thousands, except per share data) Years Ended December 31, 2018 2017 2016 Net income $ 9,035 $ 20,077 $ 25,261 Weighted-average number of common shares outstanding Basic weighted-average common shares outstanding 11,390 11,290 11,151 Dilutive potential common shares 269 268 148 Diluted weighted-average common shares outstanding 11,659 11,558 11,299 Earnings per share Basic $ 0.79 $ 1.78 $ 2.27 Diluted $ 0.77 $ 1.74 $ 2.24 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, 2018 2017 2016 Stock options and stock units 208 126 553 Recent Accounting Pronouncements New Accounting Guidance Adopted in 2018 In August 2018, the FASB issued ASU 2018-15, “Intangibles - Goodwill and Other - Internal-Use Software (Topic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract” (“ASU 2018-15”), which align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). Accordingly, the amendments require an entity (customer) in a hosting arrangement that is a service contract to follow the guidance in Subtopic 350-40 to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense. In addition, the amendments also require the entity (customer) to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement, which includes reasonably certain renewals. The new guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, which will be our interim period beginning January 1, 2020. Early adoption is permitted, including adoption in any interim period, and thus, we have chosen to early adopt ASU 2018-15 beginning July 1, 2018. We utilized the prospective transition method of adoption which allows us to capitalize software implementation projects currently in process. The adoption of ASU 2018-15 resulted in capitalizing $0.2 million of implementation costs and included as other current assets on our consolidated balance sheets as of December 31, 2018. In February 2018, the FASB issued ASU 2018-02, “Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (“AOCI”)” (“ASU 2018-02”), which provides financial statement preparers with an option to reclassify stranded income tax effects within AOCI to retained earnings in each period in which the effect of the change in U.S. federal corporate income tax rate in the Tax Cuts and Jobs Act (or portion thereof) is recorded. The new guidance was effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted and we have chosen to early adopt ASU 2018-02 beginning January 1, 2018. Further, in March 2018, the FASB issued ASU 2018-05, “Income Taxes (Topic 740): Amendments to SEC Paragraphs Pursuant to Staff Accounting Bulletin No. 118” (“ASU 2018-05”), which amends certain SEC material in Topic 740 for the income tax accounting implications of the recently issued Tax Cuts and Jobs Act (“Tax Cuts and Jobs Act”). The new guidance was effective upon inclusion in the FASB Codification. The adoption of these standards resulted in reclassifying $1.3 million of income tax effects from AOCI to retained earnings during 2018 on our consolidated balance sheets. The income tax effects remaining in AOCI will be released into earnings as the related pre-tax AOCI amounts are reclassified to earnings. 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 was effective for us beginning January 1, 2018. The adoption of this standard did not have a significant impact on our consolidated financial statements. 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 requires 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 was effective for us beginning January 1, 2018. The adoption of this standard did not have a material impact on our consolidated financial statements. See Note 12. In January 2017, the FASB issued ASU 2017-01, “Business Combinations (Topic 805): Clarifying the Definition of a Business” (“ASU 2017-01”), which clarifies the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions

Adoption of Accounting Standard

Adoption of Accounting Standards Codification 606	12 Months Ended
	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Adoption of Accounting Standards Codification 606	Adoption of Accounting Standards Codification 606 We adopted ASC 606 with an initial application as of January 1, 2018. We utilized the modified retrospective method, under which the cumulative effect of initially applying the new guidance is recognized as an adjustment to certain captions on the consolidated balance sheet, including the opening balance of retained earnings in the year ended December 31, 2018. The net impact to the various captions on our January 1, 2018 opening consolidated balance sheets was as follows: (In thousands) December 31, 2017 January 1, 2018 Unaudited Consolidated Balance Sheets Balances Without Adoption of ASC 606 Effect of Adoption Balances With Adoption of ASC 606 Assets Contract assets $ — $ 68,739 $ 68,739 Inventories $ 122,161 $ (39,002 ) $ 83,159 Non-current deferred income taxes $ 261 $ (95 ) $ 166 Liabilities Contract liabilities $ — $ 24,460 $ 24,460 Accrued liabilities $ 28,329 $ (6,091 ) $ 22,238 Non-current deferred income taxes $ 15,981 $ 2,608 $ 18,589 Shareholders’ Equity Retained earnings $ 161,364 $ 8,665 $ 170,029 Under ASC 606, we no longer net progress payments from customers related to inventory purchases against inventories but instead, they are included in contract liabilities on the consolidated balance sheets. See Note 5. The net impact to retained earnings as a result of adopting ASC 606 on the January 1, 2018 opening balance sheet was shown as a change in “other” on the consolidated statements of cash flows. The following tables summarize the impact of adopting ASC 606 on our consolidated financial statements for the year ended December 31, 2018 (in thousands, except per share data): December 31, 2018 Consolidated Balance Sheets As Reported Effect of Adoption Balances Without Adoption of ASC 606 Assets Current Assets Cash and cash equivalents $ 10,263 $ — $ 10,263 Accounts receivable, net of allowance for doubtful accounts of $1,135 at December 31, 2018 67,819 — 67,819 Contract assets 86,665 (86,665 ) — Inventories 101,125 57,527 158,652 Production cost of contracts 11,679 — 11,679 Other current assets 9,839 1,085 10,924 Total Current Assets 287,390 (28,053 ) 259,337 Property and equipment, net 107,045 — 107,045 Goodwill 136,057 — 136,057 Intangibles, net 112,092 — 112,092 Non-current deferred income taxes 308 8 316 Other assets 5,251 — 5,251 Total Assets $ 648,143 $ (28,045 ) $ 620,098 Liabilities and Shareholders’ Equity Current Liabilities Accounts payable $ 69,274 $ — $ 69,274 Contract liabilities 17,145 (17,145 ) — Accrued liabilities 37,786 4,994 42,780 Current portion of long-term debt 2,330 — 2,330 Total Current Liabilities 126,535 (12,151 ) 114,384 Long-term debt, less current portion 226,961 — 226,961 Non-current deferred income taxes 18,070 (2,570 ) 15,500 Other long-term liabilities 19,752 — 19,752 Total Liabilities 391,318 (14,721 ) 376,597 Commitments and contingencies (Notes 13, 16) Shareholders’ Equity Common stock - $0.01 par value; 35,000,000 shares authorized; 11,417,863 shares issued and outstanding at December 31, 2018 114 — 114 Additional paid-in capital 83,712 — 83,712 Retained earnings 180,356 (13,324 ) 167,032 Accumulated other comprehensive loss (7,357 ) — (7,357 ) Total Shareholders’ Equity 256,825 (13,324 ) 243,501 Total Liabilities and Shareholders’ Equity $ 648,143 $ (28,045 ) $ 620,098 Year Ended December 31, 2018 Consolidated Statements of Income As Reported Effect of Adoption Balances Without Adoption of ASC 606 Net Revenues $ 629,307 $ (15,712 ) $ 613,595 Cost of Sales 506,711 (11,458 ) 495,253 Gross Profit 122,596 (4,254 ) 118,342 Selling, General and Administrative Expenses 84,007 — 84,007 Restructuring Charges 14,671 — 14,671 Operating Income 23,918 (4,254 ) 19,664 Interest Expense (13,024 ) (1,526 ) (14,550 ) Loss on Extinguishment of Debt (926 ) — (926 ) Other Income 303 — 303 Income Before Taxes 10,271 (5,780 ) 4,491 Income Tax Expense 1,236 (1,120 ) 116 Net Income $ 9,035 $ (4,660 ) $ 4,375 Earnings Per Share Basic earnings per share $ 0.79 $ 0.38 Diluted earnings per share $ 0.77 $ 0.38 Weighted-Average Number of Common Shares Outstanding Basic 11,390 11,390 Diluted 11,659 11,659 Year Ended December 31, 2018 Consolidated Statements of Comprehensive Income As Reported Effect of Adoption Balances Without Adoption of ASC 606 Net Income $ 9,035 $ (4,660 ) $ 4,375 Other Comprehensive Income (Loss), Net of Tax: Amortization of actuarial losses included in net income, net of tax benefit of $173, for the year ended December 31, 2018 570 — 570 Actuarial loss arising during the period, net of tax benefit of $302, for the year ended December 31, 2018 (899 ) — (899 ) Change in unrealized gains on cash flow hedges, net of tax of $121 for the year ended December 31, 2018 407 — 407 Other Comprehensive Income (Loss), Net of Tax 78 — 78 Comprehensive Income $ 9,113 $ (4,660 ) $ 4,453 Year Ended December 31, 2018 Consolidated Statements of Cash Flows As Reported Effect of Adoption Balances Without Adoption of ASC 606 Cash Flows from Operating Activities Net Income $ 9,035 $ (4,660 ) $ 4,375 Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities: Depreciation and amortization 25,296 — 25,296 Property and equipment impairment due to restructuring 6,207 — 6,207 Stock-based compensation expense 5,040 — 5,040 Deferred income taxes 2,042 (2,578 ) (536 ) Provision for doubtful accounts 267 — 267 Noncash loss on extinguishment of debt 926 — 926 Other 11,659 (8,364 ) 3,295 Changes in Assets and Liabilities: Accounts receivable 7,495 — 7,495 Contract assets (86,665 ) 86,665 — Inventories 23,243 (57,527 ) (34,284 ) Production cost of contracts (1,569 ) — (1,569 ) Other assets 1,881 (1,084 ) 797 Accounts payable 18,496 — 18,496 Contract liabilities 17,145 (17,145 ) — Accrued and other liabilities 5,739 4,693 10,432 Net Cash Provided by Operating Activities 46,237 — 46,237 Cash Flows from Investing Activities Purchases of property and equipment (17,617 ) — (17,617 ) Proceeds from sale of assets 396 — 396 Payments for purchase of Certified Thermoplastics Co., LLC, net of cash acquired (30,712 ) — (30,712 ) Net Cash Used in Investing Activities (47,933 ) — (47,933 ) Cash Flows from Financing Activities Borrowings from senior secured revolving credit facility 296,400 — 296,400 Repayments of senior secured revolving credit facility (354,500 ) — (354,500 ) Borrowings from term loan 240,000 — 240,000 Repayments of term loan (167,000 ) — (167,000 ) Debt issuance costs (3,541 ) — (3,541 ) Net cash paid upon issuance of common stock under stock plans (1,550 ) — (1,550 ) Net Cash Provided by Financing Activities 9,809 — 9,809 Net Increase in Cash and Cash Equivalents 8,113 — 8,113 Cash and Cash Equivalents at Beginning of Period 2,150 — 2,150 Cash and Cash Equivalents at End of Period $ 10,263 $ — $ 10,263 Year Ended December 31, 2018 Consolidated Statements of Changes in Shareholders’ Equity As Reported Effect of Adoption Balances Without Adoption of ASC 606 Net Income $ 9,035 $ (4,660 ) $ 4,375 Other Comprehensive Loss, Net of Tax $ 78 $ — $ 78 Adoption of ASC 606 Adjustment $ 8,665 $ (8,665 ) $ — Adoption of ASU 2018-02 adjustment $ (26 ) $ — $ (26 ) Stock Options Exercised $ 1,822 $ — $ 1,822 Stock Repurchased Related to the Exercise of Stock Options $ (6,345 ) $ — $ (6,345 ) Stock Awards Vested $ 2,973 $ — $ 2,973 Stock-Based Compensation $ 5,040 $ — $ 5,040

Business Combinations

Business Combinations	12 Months Ended
	Dec. 31, 2018
Business Combinations [Abstract]
Business Combination	Business Combinations Certified Thermoplastics Co., LLC On April 23, 2018, we acquired 100.0% of the outstanding equity interests of Certified Thermoplastics Co., LLC (“CTP”), a privately-held leader in precision profile extrusions and extruded assemblies of engineered thermoplastic resins, compounds, and alloys for a wide range of commercial aerospace, defense, medical, and industrial applications. CTP is located in Santa Clarita, California. The acquisition of CTP was part of our strategy to diversify towards more customized, higher value, engineered products with greater aftermarket potential. The purchase price for CTP was $30.7 million , net of cash acquired, all payable in cash. We allocated the gross purchase price of $30.8 million to the assets acquired and liabilities assumed at estimated fair values. The excess of the purchase price over the aggregate fair values of the net assets was recorded as goodwill. 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 $ 98 Accounts receivable 1,517 Inventories 2,207 Other current assets 27 Property and equipment 603 Intangible assets 8,100 Goodwill 18,622 Total assets acquired 31,174 Current liabilities (364 ) Total liabilities assumed (364 ) Total purchase price allocation $ 30,810 Useful Life (In years) Estimated Fair Value (In thousands) Intangible assets: Customer relationships 10 $ 6,900 Trade names and trademarks 10 1,200 $ 8,100 The intangible assets acquired of $8.1 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 trade names and trademarks was assessed using the relief from royalty methodology. The goodwill of $18.6 million arising from the acquisition is attributable to the benefits we expect to derive from expected synergies from the transaction, including complementary products that will enhance our overall product portfolio, opportunities within new markets, and an acquired assembled workforce. All the goodwill was assigned to the Structural Systems segment. Since the CTP 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 $0.6 million during 2018 and charged to selling, general and administrative expenses. CTP’s results of operations have been included in our consolidated statements of income since the date of acquisition as part of the Structural Systems segment. Pro forma results of operations of the CTP acquisition have not been presented as the effect of the CTP acquisition was not material to our financial results. Lightning Diversion Systems, LLC In September 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 was 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. We allocated the gross purchase price of $62.0 million to the assets acquired and liabilities assumed at estimated fair values. The estimated fair value of the assets acquired included $22.4 million of intangible assets, $2.2 million of cash, $1.7 million of inventories, $0.9 million of accounts receivable, $0.1 million of property and equipment, $0.1 million of other current assets, and $0.3 million of liabilities assumed. The excess of the purchase price over the aggregate fair values of $34.9 million was recorded as goodwill. The intangible assets acquired were comprised of $21.1 million for customer relationships and $1.3 million for trade name, both of which were assigned an estimated useful life of 15 years . 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 was deductible for income tax purposes. LDS’ results of operations have been included in our consolidated statements of income since the date of acquisition as part of the Electronic Systems segment.

Restructuring Activities

Restructuring Activities	12 Months Ended
	Dec. 31, 2018
Restructuring and Related Activities [Abstract]
Restructuring Activities	Restructuring Activities Summary of 2017 Restructuring Plan In November 2017, management approved and commenced a restructuring plan that was intended to increase operating efficiencies. We have recorded cumulative expenses of $23.6 million through December 31, 2018, with $8.8 million recorded during 2017. In the Electronic Systems segment, we have recorded $2.6 million during 2018 and cumulative expenses of $3.8 million for severance and benefits which were classified as restructuring charges. We recorded during 2018 and on a cumulative basis, expenses of $0.9 million for loss on early exit from lease termination which was classified as restructuring charges. We also recorded during 2018 and on a cumulative basis, other expenses of $0.9 million which were classified as restructuring charges. In addition, we recorded during 2018 and on a cumulative basis, expenses of $0.2 million for professional service fees which were classified as restructuring charges. Further, we recorded during 2018 and on a cumulative basis, non-cash expenses of $0.1 million for inventory write down which were classified as cost of sales. Finally, we recorded during 2018 and on a cumulative basis, non-cash expenses of $0.1 million for property and equipment impairment which were classified as restructuring charges. In the Structural Systems segment, we have recorded $1.3 million during 2018 and cumulative expenses of $3.0 million for severance and benefits which were classified as restructuring charges. We recorded $6.2 million during 2018 and on a cumulative basis, non-cash expenses of $9.8 million for property and equipment impairment which were classified as restructuring charges. We also recorded during 2018 and on a cumulative basis, non-cash expenses of $0.5 million for inventory write down which were classified as cost of sales. In addition, we recorded during 2018 and on a cumulative basis, other expenses of $0.4 million which were classified as restructuring charges. In Corporate, we have recorded $1.0 million during 2018 and cumulative expenses of $1.4 million for severance and benefits which was classified as restructuring charges. We recorded $0.1 million during 2018 and on a cumulative basis, non-cash expenses of $1.4 million for stock-based compensation awards which were modified, all of which were classified as restructuring charges. In addition, we recorded during 2018 and on a cumulative basis, expenses of $1.0 million for professional service fees which were classified as restructuring charges. As of December 31, 2018, we have accrued $2.8 million , $0.9 million , and $0.3 million for severance and benefits, professional service fees, and loss on early exit from lease in the Electronic Systems segment, Structural Systems segment, and Corporate, respectively. Our restructuring activities for 2018 and 2017 were as follows (in thousands): December 31, 2017 2018 December 31, 2018 Balance Charges Cash Payments Non-Cash Payments Change in Estimates Balance Severance and benefits $ 2,659 $ 5,018 $ (4,346 ) $ — $ (700 ) $ 2,631 Modification of stock-based compensation awards — 105 — (105 ) — — Lease termination 66 864 (69 ) — — 861 Property and equipment impairment due to restructuring — 6,207 — (6,207 ) — — Professional service fees — 1,165 (1,122 ) — — 43 Other — 1,312 (896 ) — — 416 Total charged to restructuring charges 2,725 14,671 (6,433 ) (6,312 ) (700 ) 3,951 Inventory reserve — 121 — — (71 ) 50 Total charged to cost of sales — 121 — — (71 ) 50 Ending balance $ 2,725 $ 14,792 $ (6,433 ) $ (6,312 ) $ (771 ) $ 4,001

Inventories

Inventories	12 Months Ended
	Dec. 31, 2018
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories consisted of the following: (In thousands) December 31, 2018 2017 Raw materials and supplies $ 89,767 $ 65,221 Work in process 9,199 62,584 Finished goods 2,159 10,665 101,125 138,470 Less progress payments — 16,309 Total $ 101,125 $ 122,161 The December 31, 2017 balances were prior to the adoption of ASC 606 and as such, we netted progress payments from customers related to inventory purchases against inventories on the consolidated balance sheets. See Note 2.

Property and Equipment, Net

Property and Equipment, Net	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Property and Equipment, Net	Property and Equipment, Net Property and equipment, net consisted of the following: (In thousands) December 31, Range of Estimated 2018 2017 Useful Lives Land $ 15,662 $ 15,662 Buildings and improvements 57,642 57,024 5 - 40 Years Machinery and equipment 160,163 146,175 2 - 20 Years Furniture and equipment 19,676 21,127 2 - 10 Years Construction in progress 8,742 13,480 261,885 253,468 Less accumulated depreciation 154,840 143,216 Total $ 107,045 $ 110,252 Depreciation expense was $13.5 million , $13.2 million and $13.3 million , for the years ended December 31, 2018 , 2017 and 2016 , respectively.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill The carrying amounts of goodwill, by operating segment, for the years ended December 31, 2018 and 2017 were as follows: (In thousands) Electronic Systems Structural Systems Consolidated Ducommun Gross goodwill $ 199,157 $ — $ 199,157 Accumulated goodwill impairment (81,722 ) — (81,722 ) Balance at December 31, 2017 117,435 — 117,435 Goodwill from acquisition during the period — 18,622 18,622 Balance at December 31, 2018 $ 117,435 $ 18,622 $ 136,057 We perform our annual goodwill impairment test as of the first day of the fourth quarter. If certain factors occur, including significant under performance of our business relative to expected operating results, significant adverse economic and industry trends, significant decline in our market capitalization for an extended period of time relative to net book value, a decision to divest individual businesses within a reporting unit, or a decision to group individual businesses differently, we may perform an impairment test prior to the fourth quarter. In the fourth quarter of 2018, the carrying amount of goodwill at the date of the most recent annual impairment evaluation for Electronic Systems and Structural Systems was $117.5 million and $18.6 million , respectively. As of the date of our 2018 annual evaluation for goodwill impairment, we used a qualitative assessment including 1) margin of passing most recent step 1 analysis, 2) earnings before interest, taxes, depreciation, and amortization, 3) long-term growth rate, 4) analyzing material adverse factors/changes between valuation dates, 5) general macroeconomic factors, and 6) industry and market conditions, noting it was not more likely than not that the fair value of a reporting unit is less than its carrying amount and thus, goodwill was not deemed impaired. On April 23, 2018, we acquired 100.0% of the outstanding equity interests of CTP for a purchase price of $30.7 million , net of cash acquired. We allocated the gross purchase price of $30.8 million to the assets acquired and liabilities assumed at estimated fair values. The excess of the purchase over the aggregate fair values was recorded as goodwill. See Note 3. In September 2017, we acquired 100.0% of the outstanding equity interests of LDS for a purchase price of $60.0 million , net of cash acquired. We allocated the gross purchase price of $62.0 million to the assets acquired and liabilities assumed at estimated fair values. The excess of the purchase over the aggregate fair values was recorded as goodwill. See Note 3. Other intangible assets are related to acquisitions, including CTP, and recorded at fair value at the time of the acquisition. Other intangible assets with finite lives are generally amortized on the straight-line method over periods ranging from 10 to 18 years. Intangible assets are as follows: (In thousands) December 31, 2018 December 31, 2017 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 $ 187,200 $ 77,824 $ 109,376 $ 180,300 $ 67,449 $ 112,851 Trade names 13 2,500 193 2,307 1,300 26 1,274 Contract renewal 14 1,845 1,625 220 1,845 1,493 352 Technology 15 400 211 189 400 184 216 Total $ 191,945 $ 79,853 $ 112,092 $ 183,845 $ 69,152 $ 114,693 The carrying amount of other intangible assets by operating segment as of December 31, 2018 and 2017 was as follows: (In thousands) December 31, 2018 December 31, 2017 Gross Accumulated Amortization Net Carrying Value Gross Accumulated Amortization Net Carrying Value Other intangible assets Electronic Systems $ 164,545 $ 62,108 $ 102,437 $ 164,545 $ 52,688 $ 111,857 Structural Systems 27,400 17,745 9,655 19,300 16,464 2,836 Total $ 191,945 $ 79,853 $ 112,092 $ 183,845 $ 69,152 $ 114,693 Amortization expense of other intangible assets was $10.7 million , $9.3 million and $9.0 million for the years ended December 31, 2018 , 2017 and 2016 , respectively. Future amortization expense by operating segment is expected to be as follows: (In thousands) Electronic Systems Structural Systems Consolidated Ducommun 2019 $ 9,419 $ 1,401 $ 10,820 2020 9,348 1,300 10,648 2021 9,287 1,191 10,478 2022 9,288 1,130 10,418 2023 9,287 1,072 10,359 Thereafter 55,808 3,561 59,369 $ 102,437 $ 9,655 $ 112,092

Accrued Liabilities

Accrued Liabilities	12 Months Ended
	Dec. 31, 2018
Payables and Accruals [Abstract]
Accrued Liabilities	Accrued Liabilities The components of accrued liabilities consisted of the following: (In thousands) December 31, 2018 2017 Accrued compensation $ 29,616 $ 18,925 Accrued income tax and sales tax 82 71 Customer deposits — 3,970 Provision for forward loss reserves — 1,226 Other 8,088 4,137 Total $ 37,786 $ 28,329 The December 31, 2017 balances of customer deposits and provision for forward losses were prior to the adoption of ASC 606 and as such, classified as accrued liabilities rather than contract liabilities on the consolidated balance sheets. See Note 2.

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt Long-term debt and the current period interest rates were as follows: (In thousands) December 31, 2018 2017 Term loan $ 233,000 $ 160,000 Revolving credit facility — 58,100 Total debt 233,000 218,100 Less current portion 2,330 — Total long-term debt 230,670 218,100 Less debt issuance costs 3,709 2,045 Total long-term debt, net of debt issuance costs $ 226,961 $ 216,055 Weighted-average interest rate 4.71 % 3.73 % Future long-term debt payments at December 31, 2018 were as follows: (In thousands) 2019 $ 2,330 2020 2,330 2021 2,330 2022 2,330 2023 2,330 Thereafter 221,350 Total $ 233,000 On November 21, 2018, we completed new credit facilities to replace the Existing Credit Facilities. The new credit facilities consist of a $240.0 million senior secured term loan, which matures on November 21, 2025 (“New Term Loan”), and a $100.0 million senior secured revolving credit facility (“New Revolving Credit Facility”), which matures on November 21, 2023 (collectively, the “New Credit Facilities”). The New Term Loan bears interest, at our option, at a rate equal to either (i) the Eurodollar Rate (defined as the London Interbank Offered Rate [“LIBOR”]) plus an applicable margin ranging from 3.75% to 4.00% per year or (ii) the Base Rate (defined as the highest of [a] Federal Funds Rate plus 0.50% , [b] Bank of America’s prime rate, and [c] the Eurodollar Rate plus 1.00% ) plus an applicable margin ranging from 3.75% to 4.00% per year, in each case based upon the consolidated total net adjusted leverage ratio, typically payable quarterly. In addition, the New Term Loan requires installment payments of 0.25% of the outstanding principal balance of the New Term Loan amount on a quarterly basis. The New Revolving Credit Facility bears interest, at our option, at a rate equal to either (i) the Eurodollar Rate (defined as LIBOR) plus an applicable margin ranging from 1.75% to 2.75% per year or (ii) the Base Rate (defined as the highest of [a] Federal Funds Rate plus 0.50% , [b] Bank of America’s prime rate, and [c] the Eurodollar Rate plus 1.00% ) plus an applicable margin ranging from 0.75% to 1.75% per year, in each case based upon the consolidated total net adjusted leverage ratio, typically payable quarterly. The undrawn portion of the commitment of the New Revolving Credit Facility is subject to a commitment fee ranging from 0.200% to 0.300% , based upon the consolidated total net adjusted leverage ratio. Further, if we meet the annual excess cash flow threshold, we will be required to make excess flow payments. The annual mandatory excess cash flow payments will be based on (i) 50% of the excess cash flow amount if the adjusted leverage ratio is greater than 3.25 to 1.0, (ii) 25% of the excess cash flow amount if the adjusted leverage ratio is less than or equal to 3.25 to 1.0 but greater than 2.50 to 1.0, and (iii) zero percent of the excess cash flow amount if the adjusted leverage ratio is less than or equal to 2.50 to 1.0. As of December 31, 2018, we were in compliance with all covenants required under the New Credit Facilities. We have been making periodic voluntary principal prepayments on our Existing Credit Facilities and in conjunction with the closing of the New Credit Facilities on November 21, 2018, we drew down $240.0 million on the New Term Loan, $7.9 million on the New Revolving Credit Facility and used those proceeds along with current cash on hand to pay off the Existing Credit Facilities of $247.9 million . The New Term Loan replacing the term loan that was a part of the Existing Credit Facilities (“Existing Term Loan”) was considered an extinguishment of debt except for the portion related to a creditor that was part of the Existing Term Loan and the New Term Loan and in which case, it was considered a modification of debt. As a result, we expensed the portion of the unamortized debt issuance costs related to the Existing Term Loan that was considered an extinguishment of debt of $0.4 million . In addition, the New Revolving Credit Facility replacing the existing revolving credit facility that was part of the Existing Credit Facilities (“Existing Revolving Credit Facility”) was considered an extinguishment of debt except for the portion related to the creditors that were part of the Existing Revolving Credit Facility and the New Revolving Credit Facility and in which case, it was considered a modification of debt. As a result, we expensed the portion of the unamortized debt issuance costs related to the Existing Revolving Credit Facility that was considered an extinguishment of debt of $0.5 million . As such, an aggregate total loss on extinguishment of debt of $0.9 million was recorded in 2018. Further, we incurred $3.5 million of new debt issuance costs that can be capitalized related to the New Credit Facilities, of which $1.7 million were allocated to the New Term Loan and the $1.8 million was allocated to the New Revolving Credit facility. The New Term Loan new debt issuance costs of $1.7 million and remaining unamortized Existing Term Loan debt issuance costs of $0.1 million , for an aggregate total of $1.8 million of debt issuance costs related to the New Term Loan were capitalized and are being amortized over the seven year life of the New Term Loan. The New Revolving Credit Facility new debt issuance costs of $1.8 million and remaining unamortized Existing Revolving Credit Facility debt issuance costs of $0.2 million , for an aggregate total of $2.0 million of debt issuance costs related to the New Revolving Credit Facility were capitalized and are being amortized over the five years life of the New Existing Revolving Credit Facility. On April 23, 2018, we acquired Certified Thermoplastics Co., LLC (“CTP”) for a purchase price of $30.7 million , net of cash acquired, all payable in cash. We paid an aggregate of $30.8 million in cash by drawing down on the Existing Revolving Credit Facility. See Note 3. 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 3. As of December 31, 2018, we had $99.7 million of unused borrowing capacity under the New Revolving Credit Facility, after deducting $0.3 million for standby letters of credit. The New Credit Facilities were entered into by us (“Parent Company”) and guaranteed by all of our subsidiaries, other than two subsidiaries that were considered minor (“Subsidiary Guarantors”). The Subsidiary Guarantors jointly and severally guarantee the New Credit Facilities. The Parent Company has no independent assets or operations and therefore, no consolidating financial information for the Parent Company and its subsidiaries are presented. In October 2015, we entered into interest rate cap hedges designated as cash flow hedges with a portion of these interest rate cap hedges maturing on a quarterly basis, and a final quarterly maturity date of June 2020, in aggregate, totaling $135.0 million of our debt. We paid a total of $1.0 million in connection with the interest rate cap hedges. See Note 1 for further information. In December 2018, 2017, and 2016, we entered into agreements to purchase $2.2 million , $14.2 million , and $9.9 million of industrial revenue bonds (“IRBs”) issued by the city of Parsons, Kansas (“Parsons”) and concurrently, sold $2.2 million , $14.2 million , and $9.9 million of property and equipment (“Property”) to Parsons as well as entered into lease agreements to lease the Property from Parsons (“Lease”) with lease payments totaling $2.2 million , $14.2 million , and $9.9 million over the lease terms, respectively. The sale of the Property and concurrent lease back of the Property in December 2018, 2017, and 2016 did not meet the sale-leaseback accounting requirements as a result of our continuous involvement with the Property and thus, the $2.2 million , $14.2 million , and $9.9 million in cash received from Parsons was not recorded as a sale but as a financing obligation, respectively. Further, the Lease included a right of offset so long as we continue to own the IRBs and thus, the financing obligations of $2.2 million , $14.2 million , and $9.9 million were offset against the $2.2 million , $14.2 million , and $9.9 million , respectively, of IRBs assets and are presented net on the consolidated balance sheets with no impact to the consolidated statements of income or consolidated cash flow statements.

Shareholders' Equity

Shareholders' Equity	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Shareholders' Equity	Shareholders’ Equity We are authorized to issue five million shares of preferred stock. At December 31, 2018 and 2017 , no preferred shares were issued or outstanding.

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation Stock Incentive Compensation Plans We currently have two stock incentive plans: i) the 2013 Stock Incentive Plan, as amended (the “2013 Plan”), which expires on May 2, 2028, provided that Incentive Stock Options may not be granted after February 21, 2028, and ii) the 2018 Employee Stock Purchase Plan (“ESPP”). The 2013 Plan permit awards of stock options, restricted stock units, performance stock units and other stock-based awards to our officers, key employees and non-employee directors on terms determined by the Compensation Committee of the Board of Directors (the “Compensation Committee”). The aggregate number of shares available for issuance under the 2013 Plan is 1,690,000 . Under the 2013 Plan, no more than an aggregate of 337,693 shares are available for issue of stock-based awards other than stock options and stock appreciation rights after December 31, 2017. As of December 31, 2018 , shares available for future grant under the 2013 Plan are 490,930 . Prior to the adoption of the 2013 Plan, we granted stock-based awards to purchase shares of our common stock under certain predecessor plans. No further awards can be granted under these predecessor plans. Employee Stock Purchase Plan The ESPP was adopted by the Board of Directors and approved by the shareholders in 2018, including 750,000 shares that can be awarded. The first offering period will begin on February 1, 2019. Under the ESPP, our employees who elect to participate have the right to purchase common stock at a 15% discount from the lower of the market value of the common stock at the beginning or the end of each six month offering period and the discount will be treated as compensation to those employees. Employees purchase common stock using payroll deductions, which may not exceed 10% of their eligible compensation and other limitations. The Compensation Committee administers the ESPP. As of December 31, 2018, there are 750,000 shares available for future award grants. Stock Options In the years ended December 31, 2018 , 2017, and 2016, we granted stock options to our officers and key employees of 176,940 , 129,400 , and 123,500 , respectively, with weighted-average grant date fair values of $12.87 , $11.88 , and $6.53 , respectively. Stock options have been granted with an exercise price equal to the fair market value of our stock on the date of grant and expire not more than ten years from the date of grant. The stock options typically vest over a period of three or four years from the date of grant. The option price and number of shares are subject to adjustment under certain dilutive circumstances. If an employee terminates employment, the non-vested portion of the stock options will not vest and all rights to the non-vested portion will terminate completely. Stock option activity for the year ended December 31, 2018 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, 2018 306,225 $ 23.38 Granted 176,940 $ 33.41 Exercised (84,800 ) $ 21.48 Expired (6,075 ) $ 19.45 Forfeited (29,065 ) $ 28.90 Outstanding at December 31, 2018 363,225 $ 28.33 6.9 $ 2,934 Exerciseable at December 31, 2018 71,212 $ 23.09 3.8 $ 942 Changes in nonvested stock options for the year ended December 31, 2018 were as follows: Number of Stock Options Weighted- Average Grant Date Fair Value Nonvested at January 1, 2018 219,800 $ 11.07 Granted 176,940 $ 12.87 Vested (75,662 ) $ 10.71 Forfeited (29,065 ) $ 11.54 Nonvested at December 31, 2018 292,013 $ 12.20 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, 2018 , 2017 and 2016 was $1.3 million , $2.5 million , and $1.3 million , respectively. Cash received from stock options exercised for the years ended December 31, 2018 , 2017 and 2016 was $1.8 million , $4.3 million , and $2.1 million , respectively, with related tax benefits of $0.3 million , $0.9 million , and $0.5 million , respectively. The total amount of stock options vested and expected to vest in the future is 363,225 shares with a weighted-average exercise price of $28.33 and an aggregate intrinsic value of $2.9 million . These stock options have a weighted-average remaining contractual term of 6.9 years. The share-based compensation cost expensed for stock options for the years ended December 31, 2018 , 2017 , and 2016 (before tax benefits) was $0.9 million , $0.7 million , and $0.8 million , respectively, and is included in selling, general and administrative expenses on the consolidated income statements. At December 31, 2018 , total unrecognized compensation cost (before tax benefits) related to stock options of $2.5 million is expected to be recognized over a weighted-average period of 2.4 years. The total fair value of stock options vested during the years ended December 31, 2018 , 2017 , and 2016 was $0.8 million , $0.8 million , and $0.9 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, 2018 , 2017 , and 2016 were as follows: Years Ended December 31, 2018 2017 2016 Risk-free interest rate 2.65 % 1.75 % 1.20 % Expected volatility 53.66 % 50.37 % 51.79 % Expected dividends — — — Expected term (in months) 36 48 48 We recognize compensation expense, net of an estimated forfeiture rate, on a straight-line basis over the requisite service period of the award. We have award populations with option vesting terms of three and four years. We estimate the forfeiture rate based on our historic experience, attempting to determine any discernible activity patterns. The expected life computation is based on historic exercise patterns and post-vesting termination behavior. The risk-free interest rate for periods within the contractual life of the award is based on the U.S. Treasury yield curve in effect at the time of grant. The expected volatility is derived from historical volatility of our common stock. We suspended payments of dividends after the first quarter of 2011. Restricted Stock Units We granted restricted stock units (“RSUs”) to certain officers, key employees and non-employee directors of 81,230 , 135,350 , and 139,450 RSUs during the years ended December 31, 2018 , 2017 , and 2016 , respectively, with weighted-average grant date fair values (equal to the fair market value of our stock on the date of grant) of $32.36 , $28.97 , and $15.97 per share, respectively. RSUs represent a right to receive a share of stock at future vesting dates with no cash payment required from the holder. The RSUs typically have a three year vesting term of 33% , 33% and 34% on the first, second and third anniversaries of the date of grant, respectively. If an employee terminates employment, their non-vested portion of the RSUs will not vest and all rights to the non-vested portion will terminate. Restricted stock unit activity for the year ended December 31, 2018 was as follows: Number of Restricted Stock Units Weighted- Average Grant Date Fair Value Outstanding at January 1, 2018 185,344 $ 25.14 Granted 81,230 $ 32.36 Vested (89,513 ) $ 24.57 Forfeited (19,124 ) $ 26.85 Outstanding at December 31, 2018 157,937 $ 28.96 The share-based compensation cost expensed for RSUs for the years ended December 31, 2018 , 2017 , and 2016 (before tax benefits) was $2.1 million , $2.0 million , and $1.8 million respectively, and is included in selling, general and administrative expenses on the consolidated income statements. At December 31, 2018 , 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 1.9 years. The total fair value of RSUs vested for the years ended December 31, 2018 , 2017 , and 2016 was $2.7 million , $3.0 million , and $1.3 million , respectively. The tax benefit realized from vested RSUs for the years ended December 31, 2018 , 2017 , and 2016 was $0.6 million , $1.1 million , and $0.7 million , respectively. Performance Stock Units We granted performance stock awards (“PSUs”) to certain key employees of 64,700 , 126,000 , and 62,500 PSUs during the years ended December 31, 2018 , 2017 , and 2016 , respectively, with weighted-average grant date fair values of $35.16 , $26.31 , and $15.92 per share, respectively. PSU awards are subject to the attainment of performance goals established by the Compensation Committee, the periods during which performance is to be measured, and all other limitations and conditions applicable to the awarded shares. Performance goals are based on a pre-established objective formula that specifies the manner of determining the number of performance stock awards that will be granted if performance goals are attained. If an employee terminates employment, their non-vested portion of the PSUs will not vest and all rights to the non-vested portion will terminate. Performance stock activity for the year ended December 31, 2018 was as follows: Number of Performance Stock Units Weighted- Average Grant Date Fair Value Outstanding at January 1, 2018 221,500 $ 23.52 Granted 64,700 $ 35.16 Adjustment for target performance 3,000 $ 20.72 Vested (9,146 ) $ 25.04 Forfeited (43,354 ) $ 26.29 Outstanding at December 31, 2018 236,700 $ 26.21 The share-based compensation cost expensed for PSUs for the years ended December 31, 2018 , 2017 , and 2016 (before tax benefits) was $1.9 million , $2.0 million and $0.4 million , respectively, and is included in selling, general and administrative expenses on the consolidated income statements. At December 31, 2018 , total unrecognized compensation cost (before tax benefits) related to PSUs of $3.1 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, 2018 , 2017 , and 2016 , was $0.3 million , $1.2 million , and $1.1 million , respectively. The tax benefit realized from PSUs for the years ended December 31, 2018 , 2017 , and 2016 were $0.1 million , $0.5 million , and $0.2 million , respectively.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2018
Retirement Benefits [Abstract]
Employee Benefit Plans	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 $0.7 million and $0.1 million , respectively, at December 31, 2018 and $0.1 million and $0.7 million , respectively, at December 31, 2017 . The accumulated benefit obligations of the first two plans at December 31, 2018 and December 31, 2017 were both $0.6 million , 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, 2018 , 2017 , and 2016 was $2.6 million , $2.7 million , and $2.7 million , respectively. Other Plans We have a defined benefit pension plan covering certain hourly employees of a subsidiary (the “Pension Plan”). Pension Plan benefits are generally determined on the basis of the retiree’s age and length of service. Assets of the Pension Plan are composed primarily of fixed income and equity securities. We also have a retirement plan covering certain current and retired employees (the “LaBarge Retirement Plan”). As part of the acquisition of CTP, we acquired their defined benefit pension plan (the “CTP Pension Plan”), which covers certain current and retired employees that was fully funded by CTP as of the acquisition date of April 23, 2018. The CTP Pension Plan has been suspended as of the acquisition date but continues to cover certain current and former CTP employees. The CTP Pension Plan gross assets, liabilities, and current year expense are immaterial for disclosure purposes. The CTP Pension Plan is in the process of being liquidated with a termination date of July 31, 2018 and it may take up to 12 to 18 months to be completed. The components of net periodic pension cost for all three plans are as follows: (In thousands) Years Ended December 31, 2018 2017 2016 Service cost $ 601 $ 531 $ 531 Interest cost 1,268 1,329 1,367 Expected return on plan assets (1,784 ) (1,530 ) (1,482 ) Amortization of actuarial losses 743 810 762 Net periodic pension cost $ 828 $ 1,140 $ 1,178 The components of the reclassifications of net actuarial losses from accumulated other comprehensive loss to net income for 2018 were as follows: (In thousands) Year Ended December 31, 2018 Amortization of actuarial loss - total before tax (1) $ 743 Tax benefit (173 ) Net of tax $ 570 (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 2019 is $0.9 million . The obligations, fair value of plan assets, and funded status of both plans are as follows: (In thousands) December 31, 2018 2017 Change in benefit obligation (1) Beginning benefit obligation (January 1) $ 36,002 $ 33,154 Service cost 601 531 Interest cost 1,268 1,329 Actuarial (gain) loss (2,415 ) 2,449 Benefits paid (1,505 ) (1,461 ) Ending benefit obligation (December 31) $ 33,951 $ 36,002 Change in plan assets Beginning fair value of plan assets (January 1) $ 25,646 $ 22,015 Return on assets (1,951 ) 3,481 Employer contribution 1,559 1,611 Benefits paid (1,505 ) (1,461 ) Ending fair value of plan assets (December 31) $ 23,749 $ 25,646 Funded status (underfunded) $ (10,202 ) $ (10,356 ) Amounts recognized in the consolidated balance sheet Current liabilities $ 580 $ 560 Non-current liabilities $ 9,622 $ 9,796 Unrecognized loss included in accumulated other comprehensive loss Beginning unrecognized loss, before tax (January 1) $ 8,908 $ 9,220 Amortization (743 ) (810 ) Liability (gain) loss (2,415 ) 2,449 Asset loss (gain) 3,735 (1,951 ) Ending unrecognized loss, before tax (December 31) 9,485 8,908 Tax impact (2,263 ) (3,309 ) Unrecognized loss included in accumulated other comprehensive loss, net of tax $ 7,222 $ 5,599 (1) Projected benefit obligation equals the accumulated benefit obligation for the plans. On December 31, 2018 , our annual measurement date, the accumulated benefit obligation exceeded the fair value of the plans assets by $10.2 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, 2018 and 2017 of $7.2 million and $5.6 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, 2018 and 2017 , by asset category, were as follows: December 31, 2018 2017 Equity securities 57 % 70 % Cash and equivalents 1 % 1 % Debt securities 42 % 29 % 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, 2018 Level 1 Level 2 Level 3 Total Cash and cash equivalents $ 153 $ — $ — $ 153 Fixed income securities 3,647 — — 3,647 Equities (1) 1,475 — — 1,475 Other investments 851 — — 851 Total plan assets at fair value $ 6,126 $ — $ — 6,126 Pooled funds 17,623 Total fair value of plan assets $ 23,749 (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 (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, 2018 2017 2016 Discount rate used to determine pension expense Pension Plan 3.64 % 4.18 % 4.55 % LaBarge Retirement Plan 3.40 % 3.75 % 4.00 % The weighted-average assumptions used to determine the benefit obligations under the two plans were as follows: December 31, 2018 2017 2016 Discount rate used to determine value of obligations Pension Plan 4.23 % 3.64 % 4.18 % LaBarge Retirement Plan 4.00 % 3.40 % 3.75 % Long-term rate of return - Pension Plan only 7.00 % 7.00 % 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 2019 $ 1,206 $ 581 2020 1,282 561 2021 1,378 538 2022 1,479 512 2023 1,522 483 2024 - 2028 8,741 1,991 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 2019 .

Indemnifications

Indemnifications	12 Months Ended
	Dec. 31, 2018
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

Leases	12 Months Ended
	Dec. 31, 2018
Leases [Abstract]
Leases	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 2018 , 2017 , and 2016 was $5.3 million , $5.0 million , and $4.9 million , respectively. Future minimum rental payments under operating leases having initial or remaining non-cancelable terms in excess of one year at December 31, 2018 were as follows: (In thousands) 2019 $ 3,680 2020 3,405 2021 2,789 2022 1,404 2023 980 Thereafter 580 Total $ 12,838

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	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, 2018 2017 2016 Current tax expense Federal $ 474 $ 2,387 $ 5,953 State 1,260 525 2,982 1,734 2,912 8,935 Deferred tax (benefit) expense Federal (789 ) (15,515 ) 3,876 State 291 135 41 (498 ) (15,380 ) 3,917 Income tax expense (benefit) $ 1,236 $ (12,468 ) $ 12,852 On December 22, 2017, the U. S. enacted the Tax Cuts and Jobs Act (the “2017 Tax Act”) which, among a broad range of tax reform measures, reduced the U.S. corporate tax rate from 35.0% to 21.0% effective January 1, 2018. The reduction in the corporate tax rate required the federal portion of our deferred tax assets and liabilities at December 31, 2017 to be re-measured at the enacted tax rate expected to apply when the temporary differences are to be realized or settled using 21.0%. As a result, we recorded a provisional deferred income tax benefit of $13.0 million related to the re-measurement for the year ended December 31, 2017. SEC Staff Accounting Bulletin No. 118, “Income Tax Accounting Implications of the Tax Cuts and Jobs Act” (“SAB 118”), allowed us to record provisional amounts during a measurement period not to extend beyond one year of the enactment date. Since the 2017 Tax Act was passed late in the fourth quarter of 2017, and ongoing tax guidance and accounting interpretation were expected during 2018, we considered the accounting of the deferred tax re-measurement and other items to be incomplete as of December 31, 2017. Based on our review of proposed tax regulations and related guidance issued and available as of December 22, 2018, we determined that no refinements were needed to the tax positions and provisional amounts recorded in the fourth quarter of 2017 and finalized the accounting of the tax effects of the 2017 Tax Act as of December 31, 2018. 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 $0.2 million and $0.6 million for the years ended December 31, 2018 and 2017, respectively. 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 amount of $(0.1) million for the year ended December 31, 2016. Deferred tax (liabilities) assets were comprised of the following: (In thousands) December 31, 2018 2017 Deferred tax assets: Accrued expenses $ 704 $ 313 Allowance for doubtful accounts 267 208 Contract overrun reserves 1,263 294 Deferred compensation 302 177 Employment-related accruals 4,252 2,091 Environmental reserves 479 501 Federal tax credit carryforwards 288 5,613 Inventory reserves 1,757 1,315 Pension obligation 2,324 2,398 State net operating loss carryforwards 51 86 State tax credit carryforwards 9,075 9,051 Stock-based compensation 1,661 1,480 Workers’ compensation 51 75 Other 1,538 1,492 Total gross deferred tax assets 24,012 25,094 Valuation allowance (9,083 ) (9,013 ) Total gross deferred tax assets, net of valuation allowance 14,929 16,081 Deferred tax liabilities: Deferred revenue (649 ) — Depreciation (7,951 ) (7,976 ) Goodwill (3,963 ) (2,902 ) Intangibles (19,905 ) (20,611 ) Prepaid insurance (223 ) (312 ) Total gross deferred tax liabilities (32,691 ) (31,801 ) Net deferred tax liabilities $ (17,762 ) $ (15,720 ) We have net operating losses in various states of $2.0 million as of December 31, 2018. The state net operating loss carryforwards include $1.9 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 $2.6 million and $13.0 million , respectively, as of December 31, 2018. A valuation allowance of $11.5 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 2019 and 2038 . 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, 2018 2017 2016 Statutory federal income tax rate 21.0% 35.0% 35.0% State income taxes (net of federal benefit) 5.3 2.5 5.7 Qualified domestic production activities — (2.6) (2.0) Stock-based compensation expense (1.9) (8.2) — Research and development tax credits (32.0) (50.6) (8.6) Other tax credits (1.2) (7.5) — Changes in valuation allowance 0.7 10.6 0.9 Non-deductible book expenses 8.2 1.1 0.2 Changes in deferred tax assets 12.1 15.4 1.5 Re-measurement of deferred taxes for 2017 Tax Act — (171.3) — Changes in tax reserves 1.2 11.4 — Other (1.4) 0.4 1.0 Effective income tax (benefit) rate 12.0% (163.8)% 33.7% As a result of the 2017 Tax Act, we began utilizing the enacted U.S. corporate rate of 21.0% for the tax year 2018 and beyond. Our total amount of unrecognized tax benefits was $5.3 million , $5.3 million , and $3.0 million at December 31, 2018 , 2017 , and 2016, 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, 2018, 2017, and 2016 were not significant. If recognized, $3.6 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, 2018 2017 2016 Balance at January 1, $ 5,271 $ 3,036 $ 2,963 Additions for tax positions related to the current year 419 422 476 Additions for tax positions related to prior years 92 1,953 385 Reductions for tax positions related to prior years (499 ) (99 ) (567 ) Reductions for lapse of statute of limitations — (41 ) (221 ) Balance at December 31, $ 5,283 $ 5,271 $ 3,036 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 2013 and other state income tax returns after 2013 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

Contingencies	12 Months Ended
	Dec. 31, 2018
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, 2018 , 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, 2018 , 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 Concentrati

Major Customers and Concentrations of Credit Risk	12 Months Ended
	Dec. 31, 2018
Risks and Uncertainties [Abstract]
Major Customers and Concentrations of Credit Risk	Major Customers and Concentrations of Credit Risk We provide proprietary products and services to the Department of Defense and various United States Government agencies, and most of the aerospace and aircraft manufacturers who receive contracts directly from the U.S. Government as an original equipment manufacturer (“Primes”). In addition, we also service technology-driven markets in the industrial, medical and other end-use markets. As a result, we have significant net revenues from certain customers. Accounts receivable were diversified over a number of different commercial, military and space programs and were made by both operating segments. Net revenues from our top ten customers, including The Boeing Company (“Boeing”), Lockheed Martin Corporation (“Lockheed Martin”), Raytheon Company (“Raytheon”), Spirit AeroSystems Holdings, Inc. (“Spirit”), and United Technologies Corporation (“United Technologies”), represented the following percentages of total net sales: Years Ended December 31, 2018 2017 2016 Boeing 17.0 % 16.3 % 17.3 % Lockheed Martin 4.4 % 5.5 % 5.6 % Raytheon 11.7 % 13.5 % 8.4 % Spirit 9.5 % 8.2 % 8.2 % United Technologies 4.6 % 4.7 % 5.3 % Top ten customers (1) 62.9 % 62.5 % 58.7 % (1) Includes Boeing, Lockheed Martin, Raytheon, Spirit, and United Technologies. Boeing, Lockheed Martin, Raytheon, Spirit, and United Technologies represented the following percentages of total accounts receivable: December 31, 2018 2017 Boeing 8.0 % 7.8 % Lockheed Martin 2.5 % 5.9 % Raytheon 3.2 % 1.4 % Spirit — % 13.5 % United Technologies 2.5 % 2.3 % In 2018 , 2017 and 2016 , net revenues from foreign customers based on the location of the customer were $71.9 million , $57.2 million and $56.4 million , respectively. No net revenues from a foreign country were greater than 3.0% of total net revenues in 2018 , 2017 , and 2016 . 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 2018 , 2017 , and 2016 . We are not subject to any significant foreign currency risks as all our sales are made in United States dollars.

Business Segment Information

Business Segment Information	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Business Segment Information	Business Segment Information We supply products and services primarily to the aerospace and defense industries. Our subsidiaries are organized into two strategic businesses, Electronic Systems and Structural Systems, each of which is an operating segment as well as a reportable segment. Financial information by reportable segment was as follows: (In thousands) Years Ended December 31, 2018 2017 2016 Net Revenues Electronic Systems $ 337,868 $ 316,723 $ 304,177 Structural Systems 291,439 241,460 246,465 Total Net Revenues $ 629,307 $ 558,183 $ 550,642 Segment Operating Income (Loss) (2)(3) Electronic Systems $ 30,916 $ 31,236 $ 29,284 Structural Systems 19,063 5,790 16,844 49,979 37,026 46,128 Corporate General and Administrative Expenses (1)(2)(3) (26,061 ) (21,392 ) (16,912 ) Operating Income $ 23,918 $ 15,634 $ 29,216 Depreciation and Amortization Expenses Electronic Systems $ 14,223 $ 13,888 $ 14,087 Structural Systems 10,525 8,860 8,688 Corporate Administration 548 97 85 Total Depreciation and Amortization Expenses $ 25,296 $ 22,845 $ 22,860 Capital Expenditures Electronic Systems $ 6,719 $ 5,019 $ 3,032 Structural Systems 9,104 20,679 15,661 Corporate Administration 514 775 — Total Capital Expenditures $ 16,337 $ 26,473 $ 18,693 (1) Includes cost not allocated to either the Electronic Systems or Structural Systems operating segments. (2) The results for 2018 includes CTP’s results of operations which have been included in our consolidated statements of income since the date of acquisition as part of the Structural Systems segment. See Note 3. (3) The results for 2017 includes LDS’ results of operations which have been included in our consolidated statements of income since the date of acquisition as part of the Electronic Systems segment. See Note 3. 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 2018 and 2017 : (In thousands) December 31, 2018 2017 Total Assets Electronic Systems $ 405,743 $ 362,831 Structural Systems 226,304 193,600 Corporate Administration 16,096 10,322 Total Assets $ 648,143 $ 566,753 Goodwill and Intangibles Electronic Systems $ 219,872 $ 229,292 Structural Systems 28,277 2,836 Total Goodwill and Intangibles $ 248,149 $ 232,128 On April 23, 2018, we acquired 100.0% of the outstanding equity interests of CTP for a purchase price of $30.7 million , net of cash acquired. We allocated the gross purchase price of $30.8 million to the assets acquired and liabilities assumed at estimated fair values. The excess of the purchase price over the aggregate fair values of the net assets was recorded as goodwill. See Note 3. In September 2017, we acquired 100.0% of the outstanding equity interests of LDS for a purchase price of $60.0 million , net of cash acquired. We allocated the gross purchase price of $62.0 million to the assets acquired and liabilities assumed at estimated fair values. The excess of the purchase over the aggregate fair values was recorded as goodwill. See Note 3.

Supplemental Quarterly Financia

Supplemental Quarterly Financial Data (Unaudited)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Supplementary Quarterly Financial Data (Unaudited)	Supplemental Quarterly Financial Data (Unaudited) (In thousands, except per share amounts) Three Months Ended 2018 Three Months Ended 2017 Dec 31 Sep 29 Jun 30 Mar 31 Dec 31 Sep 30 Jul 1 Apr 1 Net Revenues $ 164,183 $ 159,842 $ 154,827 $ 150,455 $ 142,258 $ 138,690 $ 140,938 $ 136,297 Gross Profit 32,697 31,116 32,028 26,755 25,772 26,087 26,269 25,005 Income (Loss) Before Taxes 1,791 4,290 1,833 2,357 (5,057 ) 5,595 4,564 2,507 Income Tax Expense (Benefit) 1,118 119 242 (243 ) (14,541 ) 940 741 392 Net Income $ 673 $ 4,171 $ 1,591 $ 2,600 $ 9,484 $ 4,655 $ 3,823 $ 2,115 Earnings Per Share Basic earnings per share $ 0.06 $ 0.37 $ 0.14 $ 0.23 $ 0.84 $ 0.41 $ 0.34 $ 0.19 Diluted earnings per share $ 0.06 $ 0.36 $ 0.14 $ 0.22 $ 0.82 $ 0.41 $ 0.33 $ 0.18 In the fourth quarter of 2018, we recorded restructuring charges of $3.8 million as part of a restructuring plan that commenced during the fourth quarter of 2017. See Note 4. In the third quarter of 2018, we recorded restructuring charges of $3.4 million as part of a restructuring plan that commenced during the fourth quarter of 2017. See Note 4. In the second quarter of 2018, we acquired 100.0% of the outstanding equity interests of CTP and CTP’s results of operations have been included in our consolidated statements of operations since the date of acquisition as part of the Structural Systems segment. See Note 3. In addition, we recorded restructuring charges of $5.4 million as part of a restructuring plan that commenced during the fourth quarter of 2017. See Note 4. In the first quarter of 2018, we recorded restructuring charges of $2.2 million as part of a restructuring plan that commenced during the fourth quarter of 2017. See Note 4. 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 15. In addition, we commenced a restructuring plan (“2017 Restructuring Plan”) and recorded restructuring charges of $8.8 million (with $0.5 million recorded as costs of sales). See Note 4. 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 3.

Consolidated Valuation And Qual

Consolidated Valuation And Qualifying Accounts	12 Months Ended
	Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
Consolidated Valuation And Qualifying Accounts	DUCOMMUN INCORPORATED AND SUBSIDIARIES CONSOLIDATED VALUATION AND QUALIFYING ACCOUNTS YEARS ENDED DECEMBER 31, 2018, 2017, AND 2016 (in thousands) SCHEDULE II Description Balance at Beginning of Period Charged to Costs and Expenses Deductions/(Recoveries) Balance at End of Period 2018 Allowance for Doubtful Accounts $ 868 $ 776 $ 509 $ 1,135 Valuation Allowance on Deferred Tax Assets $ 9,013 $ 70 $ — $ 9,083 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

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Description of Business	Description of Business We are a leading global provider of engineering and manufacturing services for high-performance products and high-cost-of failure applications used primarily in the aerospace and defense (“A&D”), industrial, medical, and other industries (collectively, “Industrial”). Our operations are organized into two primary businesses: Electronic Systems segment and Structural Systems segment, each of which is a reportable operating segment. Electronic Systems designs, engineers and manufactures high-reliability electronic and electromechanical products used in worldwide technology-driven markets including A&D and Industrial end-use markets. Electronic Systems’ product offerings primarily range from prototype development to complex assemblies. Structural Systems designs, engineers and manufactures large, complex contoured aerostructure components and assemblies and supplies composite and metal bonded structures and assemblies. Structural Systems’ products are primarily used on commercial aircraft, military fixed-wing aircraft and military and commercial rotary-wing aircraft. All reportable operating segments follow the same accounting principles.
Basis of Presentation	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, statements of income, comprehensive income, and cash flows in accordance with accounting principles generally accepted in the United States of America (“GAAP”).
Use of Estimates	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	Reclassifications Certain prior period amounts have been reclassified to conform to current year’s presentation.
Fair Value	Fair Value Assets and liabilities that are measured, recorded or disclosed at fair value on a recurring basis are categorized using the fair value hierarchy. The fair value hierarchy has three levels based on the reliability of the inputs used to determine the fair value. Level 1, the highest level, refers to the values determined based on quoted prices in active markets for identical assets. Level 2 refers to fair values estimated using significant observable inputs. Level 3, the lowest level, includes fair values estimated using significant unobservable inputs.
Cash Equivalents	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	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, 2018 and December 31, 2017, all of our derivative instruments were designated as cash flow hedges. We record changes in the fair value of a derivative instrument that is highly effective and that is designated and qualifies as a cash flow hedge in other comprehensive income (loss), net of tax until our earnings are affected by the variability of cash flows of the underlying hedge. We record any hedge ineffectiveness and amounts excluded from effectiveness testing in current period earnings within interest expense. We report changes in the fair values of derivative instruments that are not designated or do not qualify for hedge accounting in current period earnings. We classify cash flows from derivative instruments in the consolidated statements of cash flows in the same category as the item being hedged or on a basis consistent with the nature of the instrument. In 2018, we recorded the changes in the fair value of the derivative instruments that were highly effective and that was designated and qualified as cash flow hedges in other comprehensive income (loss), net of tax, of $0.4 million . Since a portion of our cash flow hedges mature on a quarterly basis, $0.3 million of realized loss was recorded in the consolidated statements of income in 2018. 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	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 Inventories are stated at the lower of cost or net realizable value with cost being determined using a moving average cost basis for raw materials and actual cost for work-in-process and finished goods. The majority of our inventory is charged to cost of sales as raw materials are placed into production and the related revenue is recognized. Inventoried costs include raw materials, outside processing, direct labor and allocated overhead, adjusted for any abnormal amounts of idle facility expense, freight, handling costs, and wasted materials (spoilage) incurred. We assess the inventory carrying value and reduce it, if necessary, to its net realizable value based on customer orders on hand, and internal demand forecasts using management’s best estimates given information currently available. As a result of adopting ASC 606 on January 1, 2018, where we utilized the modified retrospective method of adoption and we changed our revenue recognition for the majority of our revenue from point in time to over time, our inventory balance decreased significantly. For revenue contracts where revenue is recognized using the point in time method, inventory is not reduced until it is shipped or transfer of control to the customer has occurred. Our ending inventory consists of raw materials, work-in-process, and finished goods.
Production Cost of Contracts and Revenue Recognition	Production Cost of Contracts Production cost of contracts includes non-recurring production costs, such as design and engineering costs, and tooling and other special-purpose machinery necessary to build parts as specified in a contract. Production costs of contracts are recorded to cost of sales using the over time revenue recognition model. We review the value of the production cost of contracts on a quarterly basis to ensure when added to the estimated cost to complete, the value is not greater than the estimated realizable value of the related contracts. Revenue Recognition Our customers typically engage us to manufacture products based on designs and specifications provided by the end-use customer. This will require the building of tooling and manufacturing first article inspection products (prototypes) before volume manufacturing. Contracts with our customers generally include a termination for convenience clause. We have a significant number of contracts that are started and completed within the same year, as well as contracts derived from long-term agreements and programs that can span several years. We recognize revenue under ASC 606, which utilizes a five-step model. Further, we utilized the modified retrospective method (also known as the cumulative effect method) of adoption of ASC 606. See Note 2. The definition of a contract under ASC 606 for us is typically defined as a customer purchase order as this is when we achieve enforceable right to payment. The majority of our contracts are firm fixed-price contracts. The deliverables within a customer purchase order are analyzed to determine the number of performance obligations. In addition, at times, in order to achieve economies of scale and based on our customer’s forecasted demand, we may build in advance of receiving a purchase order from our customers and in which case, we would not recognize revenue until we have received the customer purchase order. A performance obligation is a promise in a contract to transfer a distinct good or service to the customer, and is the unit of account under ASC 606. A contract’s transaction price is allocated to each distinct performance obligation and recognized as revenue when, or as, the performance obligation is satisfied. The majority of our contracts have a single performance obligation as the promise to transfer the individual goods or services are highly interrelated or met the Series guidance. For contracts with multiple performance obligations, we allocate the contract transaction price to each performance obligation using our best estimate of the standalone selling price of each distinct good or service in the contract. The primary method used to estimate the standalone selling price is the expected cost plus a margin approach, under which we forecast our expected costs of satisfying a performance obligation and then add an appropriate margin for that distinct good or service. The majority of our performance obligations are satisfied over time as work progresses. Typically, revenue is recognized over time using an input measure (i.e., costs incurred to date relative to total estimated costs at completion, also known as cost-to-cost plus reasonable profit) to measure progress. Our typical revenue contract is a firm fixed price contract, and the cost of raw materials could make up a significant amount of the total costs incurred. As such, we believe using the total costs incurred input method would be the most appropriate method. While the cost of raw materials could make up a significant amount of the total costs incurred, there is a direct relationship between our inputs and the transfer of control of goods or services to the customer as in the event the customer invokes the termination for convenience clause, we would be entitled to costs incurred to date plus a reasonable profit. The majority of our revenues are recognized over time. Contract costs typically include labor, materials, and overhead. Contract estimates are based on various assumptions to project the outcome of future events that can span multiple months or years. These assumptions include labor productivity and availability; the complexity of the work to be performed; the cost and availability of materials; and the performance of subcontractors. As a significant change in one or more of these estimates could affect the profitability of our contracts, we review and update our contract-related estimates on a regular basis. We recognize adjustments in estimated profit on contracts under the cumulative catch-up method. Under this method, the impact of the adjustment on profit recorded to date is recognized in the period the adjustment is identified. Revenue and profit in future periods of contract performance is recognized using the adjusted estimate. If at any time the estimate of contract profitability indicates an anticipated loss on the contract, we recognize the total loss in the quarter it is identified. The impact of adjustments in contract estimates on our operating earnings can be reflected in either operating costs and expenses or revenue. Net cumulative catch-up adjustments on profit recorded to date were not material for the year ended December 31, 2018. Payments under long-term contracts may be received before or after revenue is recognized. When revenue is recognized before we bill our customer, a contract asset is created for the work performed but not yet billed. Similarly, when we receive payment before we ship our products to our customer, a contract liability is created for the advance or progress payment. Contract Assets and Contract Liabilities Contract assets consist of our right to payment for work performed but not yet billed. Contract assets are transferred to accounts receivable when we ship the products to our customers and meet the shipping terms within the revenue contract. Contract liabilities consist of advance or progress payments received from our customers prior to the time transfer of control occurs plus the estimated losses on contracts.
Property and Equipment and Depreciation	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 Goodwill is evaluated for impairment on an annual basis on the first day of the fourth fiscal quarter. If certain factors occur, including significant under performance of our business relative to expected operating results, significant adverse economic and industry trends, significant decline in our market capitalization for an extended period of time relative to net book value, a decision to divest individual businesses within a reporting unit, or a decision to group individual businesses differently, we may perform an impairment test prior to the fourth quarter. In the fourth quarter of 2018, the carrying amount of goodwill at the date of the most recent annual impairment evaluation for Electronic Systems and Structural Systems was $117.5 million and $18.6 million , respectively. As of the date of our 2018 annual evaluation for goodwill impairment, we used a qualitative assessment including 1) margin of passing most recent step 1 analysis, 2) earnings before interest, taxes, depreciation, and amortization, 3) long-term growth rate, 4) analyzing material adverse factors/changes between valuation dates, 5) general macroeconomic factors, and 6) industry and market conditions, noting it was not more likely than not that the fair value of a reporting unit is less than its carrying amount and thus, goodwill was not deemed impaired.
Other Intangible Assets	Other Intangible Assets We amortize acquired other intangible assets with finite lives over the estimated economic lives of the assets, ranging from 10 to 18 years generally using the straight-line method. The value of other intangibles acquired through business combinations has been estimated using present value techniques which involve estimates of future cash flows. We evaluate other intangible assets for recoverability considering undiscounted cash flows, when significant changes in conditions occur, and recognize impairment losses, if any, based upon the estimated fair value of the assets.
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Accumulated other comprehensive loss, as reflected on the consolidated balance sheets under the equity section, was comprised of cumulative pension and retirement liability adjustments, net of tax, and change in net unrealized gains and losses on cash flow hedges, net of tax.
Provision for Estimated Losses on Contracts	Provision for Estimated Losses on Contracts We record provisions for the total anticipated losses on contracts, considering total estimated costs to complete the contract compared to total anticipated revenues, in the period in which such losses are identified. The provisions for estimated losses on contracts require us to make certain estimates and assumptions, including those with respect to the future revenue under a contract and the future cost to complete the contract. Our estimate of the future cost to complete a contract may include assumptions as to changes in manufacturing efficiency, operating and material costs, and our ability to resolve claims and assertions with our customers. If any of these or other assumptions and estimates do not materialize in the future, we may be required to adjust the provisions for estimated losses on contracts. As a result of the adoption of ASC 606 on January 1, 2018, the definition of a revenue contract with a customer for us now has changed and is typically defined as a customer purchase order. As such, in certain scenarios such as at the inception of a long-term agreement where our customer may be issuing purchase orders over the duration of the long-term agreement, we may be required to recognize anticipated losses on some of these contracts that would not have occurred under ASC 605. In addition, provision for estimated losses on contracts are now included as part of contract liabilities on the consolidated balance sheets.
Income Taxes	Income Taxes The provision for income taxes is determined using an estimated annual effective tax rate, which is generally less than the U.S. federal statutory rate, primarily as a result of research and development (“R&D”) tax credits. Our effective tax rate may be subject to fluctuations during the year as new information is obtained, which may affect the assumptions used to estimate the annual effective tax rate, including factors such as 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 United States (“U.S.”) enacted the Tax Cuts and Jobs Act (the “2017 Tax Act”). The 2017 Tax Act represented major tax reform legislation that, among other provisions, reduced the U.S. corporate tax rate from 35.0% to 21.0% effective January 1, 2018. In our consolidated financial statements included in our 2017 Annual Report on Form 10-K, we recognized provisional amounts for the income tax effects of the 2017 Tax Act which included $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 in accordance with SEC Staff Accounting Bulletin No. 118 (“SAB 118”). SAB 118 provided 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 and allowed a measurement period to make refinements and finalize the tax effects not exceed one year from the enactment date. During the fourth quarter of 2018, we finalized our accounting for the tax effects of the 2017 Tax Act.
Litigation and Commitments	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 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	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	Earnings Per Share Basic earnings per share are computed by dividing income available to common shareholders by the weighted-average number of common shares outstanding in each period. Diluted earnings per share 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.
Recent Accounting Pronouncements	Recent Accounting Pronouncements New Accounting Guidance Adopted in 2018 In August 2018, the FASB issued ASU 2018-15, “Intangibles - Goodwill and Other - Internal-Use Software (Topic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract” (“ASU 2018-15”), which align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). Accordingly, the amendments require an entity (customer) in a hosting arrangement that is a service contract to follow the guidance in Subtopic 350-40 to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense. In addition, the amendments also require the entity (customer) to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement, which includes reasonably certain renewals. The new guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, which will be our interim period beginning January 1, 2020. Early adoption is permitted, including adoption in any interim period, and thus, we have chosen to early adopt ASU 2018-15 beginning July 1, 2018. We utilized the prospective transition method of adoption which allows us to capitalize software implementation projects currently in process. The adoption of ASU 2018-15 resulted in capitalizing $0.2 million of implementation costs and included as other current assets on our consolidated balance sheets as of December 31, 2018. In February 2018, the FASB issued ASU 2018-02, “Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income (“AOCI”)” (“ASU 2018-02”), which provides financial statement preparers with an option to reclassify stranded income tax effects within AOCI to retained earnings in each period in which the effect of the change in U.S. federal corporate income tax rate in the Tax Cuts and Jobs Act (or portion thereof) is recorded. The new guidance was effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Early adoption is permitted and we have chosen to early adopt ASU 2018-02 beginning January 1, 2018. Further, in March 2018, the FASB issued ASU 2018-05, “Income Taxes (Topic 740): Amendments to SEC Paragraphs Pursuant to Staff Accounting Bulletin No. 118” (“ASU 2018-05”), which amends certain SEC material in Topic 740 for the income tax accounting implications of the recently issued Tax Cuts and Jobs Act (“Tax Cuts and Jobs Act”). The new guidance was effective upon inclusion in the FASB Codification. The adoption of these standards resulted in reclassifying $1.3 million of income tax effects from AOCI to retained earnings during 2018 on our consolidated balance sheets. The income tax effects remaining in AOCI will be released into earnings as the related pre-tax AOCI amounts are reclassified to earnings. 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 was effective for us beginning January 1, 2018. The adoption of this standard did not have a significant impact on our consolidated financial statements. 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 requires 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 was effective for us beginning January 1, 2018. The adoption of this standard did not have a material impact on our consolidated financial statements. See Note 12. In January 2017, the FASB issued ASU 2017-01, “Business Combinations (Topic 805): Clarifying the Definition of a Business” (“ASU 2017-01”), which clarifies 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 was effective for us beginning January 1, 2018. The adoption of this standard did not have a significant impact on our consolidated financial statements. 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 was effective for us beginning January 1, 2018. The adoption of this standard did not have a significant impact on our 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 was effective for us beginning January 1, 2018. The cumulative impact to our retained earnings at January 1, 2018 was a net increase of $8.7 million . See Note 2. Recently Issued Accounting Standards In August 2018, the FASB issued ASU 2018-14, “Compensation - Retirement Benefits - Defined Benefit Plans - General (Topic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans” (“ASU 2018-14”), which will remove disclosures that no longer are considered cost-beneficial, clarify the specific requirements of disclosures, and add disclosure requirements identified as relevant. The new guidance is effective for fiscal years ending after December 15, 2020 and no amendments are made to the interim disclosure requirements. Early adoption is permitted. We are evaluating the impact of this standard. In August 2018, the FASB issued ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement” (“ASU 2018-13”), which should improve the effectiveness of fair value measurement disclosures by removing certain requirements, modifying certain requirements, and adding certain new requirements. The new guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, which will be our interim period beginning January 1, 2020. Early adoption is permitted. We are evaluating the impact of this standard. In 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 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 June 2016, the FASB issued ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” (“ASU 2016-13”), which is intended to improve financial reporting by requiring timelier recording of credit losses on loans and other financial instruments held by financial institutions and other organizations. ASU 2016-13 requires the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. Financial institutions and other organizations will now use forward-looking information to better inform their credit loss estimates. Many of the loss estimation techniques applied today will still be permitted, although the inputs to those techniques will change to reflect the full amount of expected credit losses. Organizations will continue to use judgment to determine which loss estimation method is appropriate for their circumstances. ASU 2016-13 requires enhanced disclosures to help investors and other financial statement users better understand significant estimates and judgments used in estimating credit losses, as well as the credit quality and underwriting standards of an organization’s portfolio. These disclosures include qualitative and quantitative requirements that provide additional information about the amounts recorded in the financial statements. The new guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, which will be our interim period beginning January 1, 2020. We are evaluating the impact of this standard. 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 have completed the assessment and gap identification phase and are nearing the completion of the implementation of a new lease accounting software package. The assessment and gap identification phase included gathering and analyzing our leases, and identifying potential gaps in our internal controls as a result of adopting ASU 2016-02. The new accounting standard will be adopted using the additional transition method. Under this method, the cumulative effect of applying the new guidance is recognized as an adjustment to certain captions on the balance sheet, including the opening balance of retained earnings in the first quarter of 2019, and the prior years’ financial information will be presented under the prior accounting standard, ASC 840, “Leases,” (“ASC 840”). In addition, we will be utilizing the various practical expedients available under the new accounting standard as follows: • Short term (12 months or less) leases practical expedient; • Package of three practical expedients; • Existing or expired land easements assessment practical expedient; • Separate lease and non-lease components practical expedient; and • Sale and leaseback transactions before the effective date practical expedient. We have periodically briefed our Audit Committee of the Board of Directors on the progress made towards the adoption of this lease 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. As a result of electing to utilize the various practical expedients available under this new accounting standard, we anticipate the number of our leases that will be recorded onto our consolidated balance sheets will not be significant, however, the amounts that will be recorded will have a significant impact on various line items on our consolidated balance sheets and we are evaluating the impact on our income statements and cash flow statements. Additional guidance was issued subsequently as follows: • July 2018, the FASB issued ASU 2018-11, “Leases (Topic 842): Targeted Improvements” (“ASU 2018-11”); • July 2018, the FASB issued ASU 2018-10, “Codification Improvements to Topic 842, Leases” (“ASU 2018-10”); and • January 2018, the FASB issued ASU 2018-01, “Leases (Topic 842): Land Easement Practical Expedient for Transition to Topic 842” (“ASU 2018-01”). All of this new guidance is effective for us beginning January 1, 2019.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Schedule of Cash Flow, Supplemental Disclosures	Supplemental Cash Flow Information (In thousands) Years Ended December 31, 2018 2017 2016 Interest paid $ 11,573 $ 7,307 $ 6,877 Taxes paid $ 316 $ 3,125 $ 9,778 Non-cash activities: Purchases of property and equipment not paid $ 824 $ 2,104 $ 3,241
Contract with Customer, Asset and Liability	Contract assets and contract liabilities from revenue contracts with customers are as follows: (In thousands) December 31, December 31, Contract assets $ 86,665 $ — Contract liabilities $ 17,145 $ —
Disaggregation of Revenue	In addition to the revenue categories disclosed above, the following table reflects our revenue disaggregated by major end-use market: (In thousands) Years Ended December 31, % of Net Revenues Change 2018 2017 2018 2017 Consolidated Ducommun Military and space $ 8,901 $ 276,659 $ 267,758 44.0 % 48.0 % Commercial aerospace 68,101 304,455 236,354 48.4 % 42.3 % Industrial (5,878 ) 48,193 54,071 7.6 % 9.7 % Total $ 71,124 $ 629,307 $ 558,183 100.0 % 100.0 % Electronic Systems Military and space $ 3,684 $ 214,786 $ 211,102 63.6 % 66.6 % Commercial aerospace 23,339 74,889 51,550 22.2 % 16.3 % Industrial (5,878 ) 48,193 54,071 14.2 % 17.1 % Total $ 21,145 $ 337,868 $ 316,723 100.0 % 100.0 % Structural Systems Military and space $ 5,217 $ 61,873 $ 56,656 21.2 % 23.5 % Commercial aerospace 44,762 229,566 184,804 78.8 % 76.5 % Total $ 49,979 $ 291,439 $ 241,460 100.0 % 100.0 %
Weighted Average Number of Shares Outstanding Used to Compute Earnings Per Share	The net earnings and weighted-average number of common shares outstanding used to compute earnings per share were as follows: (In thousands, except per share data) Years Ended December 31, 2018 2017 2016 Net income $ 9,035 $ 20,077 $ 25,261 Weighted-average number of common shares outstanding Basic weighted-average common shares outstanding 11,390 11,290 11,151 Dilutive potential common shares 269 268 148 Diluted weighted-average common shares outstanding 11,659 11,558 11,299 Earnings per share Basic $ 0.79 $ 1.78 $ 2.27 Diluted $ 0.77 $ 1.74 $ 2.24
Weighted Average Number of Shares Outstanding Excluded from Computation of Diluted Earnings	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, 2018 2017 2016 Stock options and stock units 208 126 553

Adoption of Accounting Standa_2

Adoption of Accounting Standards Codification 606 (Tables)	12 Months Ended
	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Schedule of New Accounting Pronouncements	The following tables summarize the impact of adopting ASC 606 on our consolidated financial statements for the year ended December 31, 2018 (in thousands, except per share data): December 31, 2018 Consolidated Balance Sheets As Reported Effect of Adoption Balances Without Adoption of ASC 606 Assets Current Assets Cash and cash equivalents $ 10,263 $ — $ 10,263 Accounts receivable, net of allowance for doubtful accounts of $1,135 at December 31, 2018 67,819 — 67,819 Contract assets 86,665 (86,665 ) — Inventories 101,125 57,527 158,652 Production cost of contracts 11,679 — 11,679 Other current assets 9,839 1,085 10,924 Total Current Assets 287,390 (28,053 ) 259,337 Property and equipment, net 107,045 — 107,045 Goodwill 136,057 — 136,057 Intangibles, net 112,092 — 112,092 Non-current deferred income taxes 308 8 316 Other assets 5,251 — 5,251 Total Assets $ 648,143 $ (28,045 ) $ 620,098 Liabilities and Shareholders’ Equity Current Liabilities Accounts payable $ 69,274 $ — $ 69,274 Contract liabilities 17,145 (17,145 ) — Accrued liabilities 37,786 4,994 42,780 Current portion of long-term debt 2,330 — 2,330 Total Current Liabilities 126,535 (12,151 ) 114,384 Long-term debt, less current portion 226,961 — 226,961 Non-current deferred income taxes 18,070 (2,570 ) 15,500 Other long-term liabilities 19,752 — 19,752 Total Liabilities 391,318 (14,721 ) 376,597 Commitments and contingencies (Notes 13, 16) Shareholders’ Equity Common stock - $0.01 par value; 35,000,000 shares authorized; 11,417,863 shares issued and outstanding at December 31, 2018 114 — 114 Additional paid-in capital 83,712 — 83,712 Retained earnings 180,356 (13,324 ) 167,032 Accumulated other comprehensive loss (7,357 ) — (7,357 ) Total Shareholders’ Equity 256,825 (13,324 ) 243,501 Total Liabilities and Shareholders’ Equity $ 648,143 $ (28,045 ) $ 620,098 Year Ended December 31, 2018 Consolidated Statements of Income As Reported Effect of Adoption Balances Without Adoption of ASC 606 Net Revenues $ 629,307 $ (15,712 ) $ 613,595 Cost of Sales 506,711 (11,458 ) 495,253 Gross Profit 122,596 (4,254 ) 118,342 Selling, General and Administrative Expenses 84,007 — 84,007 Restructuring Charges 14,671 — 14,671 Operating Income 23,918 (4,254 ) 19,664 Interest Expense (13,024 ) (1,526 ) (14,550 ) Loss on Extinguishment of Debt (926 ) — (926 ) Other Income 303 — 303 Income Before Taxes 10,271 (5,780 ) 4,491 Income Tax Expense 1,236 (1,120 ) 116 Net Income $ 9,035 $ (4,660 ) $ 4,375 Earnings Per Share Basic earnings per share $ 0.79 $ 0.38 Diluted earnings per share $ 0.77 $ 0.38 Weighted-Average Number of Common Shares Outstanding Basic 11,390 11,390 Diluted 11,659 11,659 Year Ended December 31, 2018 Consolidated Statements of Comprehensive Income As Reported Effect of Adoption Balances Without Adoption of ASC 606 Net Income $ 9,035 $ (4,660 ) $ 4,375 Other Comprehensive Income (Loss), Net of Tax: Amortization of actuarial losses included in net income, net of tax benefit of $173, for the year ended December 31, 2018 570 — 570 Actuarial loss arising during the period, net of tax benefit of $302, for the year ended December 31, 2018 (899 ) — (899 ) Change in unrealized gains on cash flow hedges, net of tax of $121 for the year ended December 31, 2018 407 — 407 Other Comprehensive Income (Loss), Net of Tax 78 — 78 Comprehensive Income $ 9,113 $ (4,660 ) $ 4,453 Year Ended December 31, 2018 Consolidated Statements of Cash Flows As Reported Effect of Adoption Balances Without Adoption of ASC 606 Cash Flows from Operating Activities Net Income $ 9,035 $ (4,660 ) $ 4,375 Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities: Depreciation and amortization 25,296 — 25,296 Property and equipment impairment due to restructuring 6,207 — 6,207 Stock-based compensation expense 5,040 — 5,040 Deferred income taxes 2,042 (2,578 ) (536 ) Provision for doubtful accounts 267 — 267 Noncash loss on extinguishment of debt 926 — 926 Other 11,659 (8,364 ) 3,295 Changes in Assets and Liabilities: Accounts receivable 7,495 — 7,495 Contract assets (86,665 ) 86,665 — Inventories 23,243 (57,527 ) (34,284 ) Production cost of contracts (1,569 ) — (1,569 ) Other assets 1,881 (1,084 ) 797 Accounts payable 18,496 — 18,496 Contract liabilities 17,145 (17,145 ) — Accrued and other liabilities 5,739 4,693 10,432 Net Cash Provided by Operating Activities 46,237 — 46,237 Cash Flows from Investing Activities Purchases of property and equipment (17,617 ) — (17,617 ) Proceeds from sale of assets 396 — 396 Payments for purchase of Certified Thermoplastics Co., LLC, net of cash acquired (30,712 ) — (30,712 ) Net Cash Used in Investing Activities (47,933 ) — (47,933 ) Cash Flows from Financing Activities Borrowings from senior secured revolving credit facility 296,400 — 296,400 Repayments of senior secured revolving credit facility (354,500 ) — (354,500 ) Borrowings from term loan 240,000 — 240,000 Repayments of term loan (167,000 ) — (167,000 ) Debt issuance costs (3,541 ) — (3,541 ) Net cash paid upon issuance of common stock under stock plans (1,550 ) — (1,550 ) Net Cash Provided by Financing Activities 9,809 — 9,809 Net Increase in Cash and Cash Equivalents 8,113 — 8,113 Cash and Cash Equivalents at Beginning of Period 2,150 — 2,150 Cash and Cash Equivalents at End of Period $ 10,263 $ — $ 10,263 Year Ended December 31, 2018 Consolidated Statements of Changes in Shareholders’ Equity As Reported Effect of Adoption Balances Without Adoption of ASC 606 Net Income $ 9,035 $ (4,660 ) $ 4,375 Other Comprehensive Loss, Net of Tax $ 78 $ — $ 78 Adoption of ASC 606 Adjustment $ 8,665 $ (8,665 ) $ — Adoption of ASU 2018-02 adjustment $ (26 ) $ — $ (26 ) Stock Options Exercised $ 1,822 $ — $ 1,822 Stock Repurchased Related to the Exercise of Stock Options $ (6,345 ) $ — $ (6,345 ) Stock Awards Vested $ 2,973 $ — $ 2,973 Stock-Based Compensation $ 5,040 $ — $ 5,040 The net impact to the various captions on our January 1, 2018 opening consolidated balance sheets was as follows: (In thousands) December 31, 2017 January 1, 2018 Unaudited Consolidated Balance Sheets Balances Without Adoption of ASC 606 Effect of Adoption Balances With Adoption of ASC 606 Assets Contract assets $ — $ 68,739 $ 68,739 Inventories $ 122,161 $ (39,002 ) $ 83,159 Non-current deferred income taxes $ 261 $ (95 ) $ 166 Liabilities Contract liabilities $ — $ 24,460 $ 24,460 Accrued liabilities $ 28,329 $ (6,091 ) $ 22,238 Non-current deferred income taxes $ 15,981 $ 2,608 $ 18,589 Shareholders’ Equity Retained earnings $ 161,364 $ 8,665 $ 170,029

Business Combinations (Tables)

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2018
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 $ 98 Accounts receivable 1,517 Inventories 2,207 Other current assets 27 Property and equipment 603 Intangible assets 8,100 Goodwill 18,622 Total assets acquired 31,174 Current liabilities (364 ) Total liabilities assumed (364 ) Total purchase price allocation $ 30,810
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 10 $ 6,900 Trade names and trademarks 10 1,200 $ 8,100

Restructuring Activities (Table

Restructuring Activities (Tables)	12 Months Ended
	Dec. 31, 2018
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Activities	Our restructuring activities for 2018 and 2017 were as follows (in thousands): December 31, 2017 2018 December 31, 2018 Balance Charges Cash Payments Non-Cash Payments Change in Estimates Balance Severance and benefits $ 2,659 $ 5,018 $ (4,346 ) $ — $ (700 ) $ 2,631 Modification of stock-based compensation awards — 105 — (105 ) — — Lease termination 66 864 (69 ) — — 861 Property and equipment impairment due to restructuring — 6,207 — (6,207 ) — — Professional service fees — 1,165 (1,122 ) — — 43 Other — 1,312 (896 ) — — 416 Total charged to restructuring charges 2,725 14,671 (6,433 ) (6,312 ) (700 ) 3,951 Inventory reserve — 121 — — (71 ) 50 Total charged to cost of sales — 121 — — (71 ) 50 Ending balance $ 2,725 $ 14,792 $ (6,433 ) $ (6,312 ) $ (771 ) $ 4,001

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2018
Inventory Disclosure [Abstract]
Summary of Inventories	Inventories consisted of the following: (In thousands) December 31, 2018 2017 Raw materials and supplies $ 89,767 $ 65,221 Work in process 9,199 62,584 Finished goods 2,159 10,665 101,125 138,470 Less progress payments — 16,309 Total $ 101,125 $ 122,161

Property and Equipment, Net (Ta

Property and Equipment, Net (Tables)	12 Months Ended
	Dec. 31, 2018
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 2018 2017 Useful Lives Land $ 15,662 $ 15,662 Buildings and improvements 57,642 57,024 5 - 40 Years Machinery and equipment 160,163 146,175 2 - 20 Years Furniture and equipment 19,676 21,127 2 - 10 Years Construction in progress 8,742 13,480 261,885 253,468 Less accumulated depreciation 154,840 143,216 Total $ 107,045 $ 110,252

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The carrying amounts of goodwill, by operating segment, for the years ended December 31, 2018 and 2017 were as follows: (In thousands) Electronic Systems Structural Systems Consolidated Ducommun Gross goodwill $ 199,157 $ — $ 199,157 Accumulated goodwill impairment (81,722 ) — (81,722 ) Balance at December 31, 2017 117,435 — 117,435 Goodwill from acquisition during the period — 18,622 18,622 Balance at December 31, 2018 $ 117,435 $ 18,622 $ 136,057
Other Intangible Assets	Intangible assets are as follows: (In thousands) December 31, 2018 December 31, 2017 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 $ 187,200 $ 77,824 $ 109,376 $ 180,300 $ 67,449 $ 112,851 Trade names 13 2,500 193 2,307 1,300 26 1,274 Contract renewal 14 1,845 1,625 220 1,845 1,493 352 Technology 15 400 211 189 400 184 216 Total $ 191,945 $ 79,853 $ 112,092 $ 183,845 $ 69,152 $ 114,693 The carrying amount of other intangible assets by operating segment as of December 31, 2018 and 2017 was as follows: (In thousands) December 31, 2018 December 31, 2017 Gross Accumulated Amortization Net Carrying Value Gross Accumulated Amortization Net Carrying Value Other intangible assets Electronic Systems $ 164,545 $ 62,108 $ 102,437 $ 164,545 $ 52,688 $ 111,857 Structural Systems 27,400 17,745 9,655 19,300 16,464 2,836 Total $ 191,945 $ 79,853 $ 112,092 $ 183,845 $ 69,152 $ 114,693
Summary of Future Amortization Expense	Future amortization expense by operating segment is expected to be as follows: (In thousands) Electronic Systems Structural Systems Consolidated Ducommun 2019 $ 9,419 $ 1,401 $ 10,820 2020 9,348 1,300 10,648 2021 9,287 1,191 10,478 2022 9,288 1,130 10,418 2023 9,287 1,072 10,359 Thereafter 55,808 3,561 59,369 $ 102,437 $ 9,655 $ 112,092

Accrued Liabilities (Tables)

Accrued Liabilities (Tables)	12 Months Ended
	Dec. 31, 2018
Payables and Accruals [Abstract]
Summary of Accrued Liabilities	The components of accrued liabilities consisted of the following: (In thousands) December 31, 2018 2017 Accrued compensation $ 29,616 $ 18,925 Accrued income tax and sales tax 82 71 Customer deposits — 3,970 Provision for forward loss reserves — 1,226 Other 8,088 4,137 Total $ 37,786 $ 28,329

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Long Term Debt Summary	Long-term debt and the current period interest rates were as follows: (In thousands) December 31, 2018 2017 Term loan $ 233,000 $ 160,000 Revolving credit facility — 58,100 Total debt 233,000 218,100 Less current portion 2,330 — Total long-term debt 230,670 218,100 Less debt issuance costs 3,709 2,045 Total long-term debt, net of debt issuance costs $ 226,961 $ 216,055 Weighted-average interest rate 4.71 % 3.73 %
Future Long Term Debt Payments	Future long-term debt payments at December 31, 2018 were as follows: (In thousands) 2019 $ 2,330 2020 2,330 2021 2,330 2022 2,330 2023 2,330 Thereafter 221,350 Total $ 233,000

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Option Activity	Stock option activity for the year ended December 31, 2018 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, 2018 306,225 $ 23.38 Granted 176,940 $ 33.41 Exercised (84,800 ) $ 21.48 Expired (6,075 ) $ 19.45 Forfeited (29,065 ) $ 28.90 Outstanding at December 31, 2018 363,225 $ 28.33 6.9 $ 2,934 Exerciseable at December 31, 2018 71,212 $ 23.09 3.8 $ 942
Schedule of Nonvested Options Activity	Changes in nonvested stock options for the year ended December 31, 2018 were as follows: Number of Stock Options Weighted- Average Grant Date Fair Value Nonvested at January 1, 2018 219,800 $ 11.07 Granted 176,940 $ 12.87 Vested (75,662 ) $ 10.71 Forfeited (29,065 ) $ 11.54 Nonvested at December 31, 2018 292,013 $ 12.20
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, 2018 , 2017 , and 2016 were as follows: Years Ended December 31, 2018 2017 2016 Risk-free interest rate 2.65 % 1.75 % 1.20 % Expected volatility 53.66 % 50.37 % 51.79 % Expected dividends — — — Expected term (in months) 36 48 48 The weighted-average assumptions used to determine the net periodic benefit costs under the two plans were as follows: Years Ended December 31, 2018 2017 2016 Discount rate used to determine pension expense Pension Plan 3.64 % 4.18 % 4.55 % LaBarge Retirement Plan 3.40 % 3.75 % 4.00 % The weighted-average assumptions used to determine the benefit obligations under the two plans were as follows: December 31, 2018 2017 2016 Discount rate used to determine value of obligations Pension Plan 4.23 % 3.64 % 4.18 % LaBarge Retirement Plan 4.00 % 3.40 % 3.75 % Long-term rate of return - Pension Plan only 7.00 % 7.00 % 7.50 %
Schedule of Restricted Stock Units Activity	Restricted stock unit activity for the year ended December 31, 2018 was as follows: Number of Restricted Stock Units Weighted- Average Grant Date Fair Value Outstanding at January 1, 2018 185,344 $ 25.14 Granted 81,230 $ 32.36 Vested (89,513 ) $ 24.57 Forfeited (19,124 ) $ 26.85 Outstanding at December 31, 2018 157,937 $ 28.96
Schedule of Performance-based Units Activity	Performance stock activity for the year ended December 31, 2018 was as follows: Number of Performance Stock Units Weighted- Average Grant Date Fair Value Outstanding at January 1, 2018 221,500 $ 23.52 Granted 64,700 $ 35.16 Adjustment for target performance 3,000 $ 20.72 Vested (9,146 ) $ 25.04 Forfeited (43,354 ) $ 26.29 Outstanding at December 31, 2018 236,700 $ 26.21

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2018
Retirement Benefits [Abstract]
Components of Net Periodic Pension Cost	The components of net periodic pension cost for all three plans are as follows: (In thousands) Years Ended December 31, 2018 2017 2016 Service cost $ 601 $ 531 $ 531 Interest cost 1,268 1,329 1,367 Expected return on plan assets (1,784 ) (1,530 ) (1,482 ) Amortization of actuarial losses 743 810 762 Net periodic pension cost $ 828 $ 1,140 $ 1,178
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 2018 were as follows: (In thousands) Year Ended December 31, 2018 Amortization of actuarial loss - total before tax (1) $ 743 Tax benefit (173 ) Net of tax $ 570 (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, 2018 2017 Change in benefit obligation (1) Beginning benefit obligation (January 1) $ 36,002 $ 33,154 Service cost 601 531 Interest cost 1,268 1,329 Actuarial (gain) loss (2,415 ) 2,449 Benefits paid (1,505 ) (1,461 ) Ending benefit obligation (December 31) $ 33,951 $ 36,002 Change in plan assets Beginning fair value of plan assets (January 1) $ 25,646 $ 22,015 Return on assets (1,951 ) 3,481 Employer contribution 1,559 1,611 Benefits paid (1,505 ) (1,461 ) Ending fair value of plan assets (December 31) $ 23,749 $ 25,646 Funded status (underfunded) $ (10,202 ) $ (10,356 ) Amounts recognized in the consolidated balance sheet Current liabilities $ 580 $ 560 Non-current liabilities $ 9,622 $ 9,796 Unrecognized loss included in accumulated other comprehensive loss Beginning unrecognized loss, before tax (January 1) $ 8,908 $ 9,220 Amortization (743 ) (810 ) Liability (gain) loss (2,415 ) 2,449 Asset loss (gain) 3,735 (1,951 ) Ending unrecognized loss, before tax (December 31) 9,485 8,908 Tax impact (2,263 ) (3,309 ) Unrecognized loss included in accumulated other comprehensive loss, net of tax $ 7,222 $ 5,599 (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, 2018 Level 1 Level 2 Level 3 Total Cash and cash equivalents $ 153 $ — $ — $ 153 Fixed income securities 3,647 — — 3,647 Equities (1) 1,475 — — 1,475 Other investments 851 — — 851 Total plan assets at fair value $ 6,126 $ — $ — 6,126 Pooled funds 17,623 Total fair value of plan assets $ 23,749 (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 (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, 2018 and 2017 , by asset category, were as follows: December 31, 2018 2017 Equity securities 57 % 70 % Cash and equivalents 1 % 1 % Debt securities 42 % 29 % 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, 2018 , 2017 , and 2016 were as follows: Years Ended December 31, 2018 2017 2016 Risk-free interest rate 2.65 % 1.75 % 1.20 % Expected volatility 53.66 % 50.37 % 51.79 % Expected dividends — — — Expected term (in months) 36 48 48 The weighted-average assumptions used to determine the net periodic benefit costs under the two plans were as follows: Years Ended December 31, 2018 2017 2016 Discount rate used to determine pension expense Pension Plan 3.64 % 4.18 % 4.55 % LaBarge Retirement Plan 3.40 % 3.75 % 4.00 % The weighted-average assumptions used to determine the benefit obligations under the two plans were as follows: December 31, 2018 2017 2016 Discount rate used to determine value of obligations Pension Plan 4.23 % 3.64 % 4.18 % LaBarge Retirement Plan 4.00 % 3.40 % 3.75 % Long-term rate of return - Pension Plan only 7.00 % 7.00 % 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 2019 $ 1,206 $ 581 2020 1,282 561 2021 1,378 538 2022 1,479 512 2023 1,522 483 2024 - 2028 8,741 1,991

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2018
Leases [Abstract]
Future Minimum Rental Payments Under Operating Leases	Future minimum rental payments under operating leases having initial or remaining non-cancelable terms in excess of one year at December 31, 2018 were as follows: (In thousands) 2019 $ 3,680 2020 3,405 2021 2,789 2022 1,404 2023 980 Thereafter 580 Total $ 12,838

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2018 2017 2016 Current tax expense Federal $ 474 $ 2,387 $ 5,953 State 1,260 525 2,982 1,734 2,912 8,935 Deferred tax (benefit) expense Federal (789 ) (15,515 ) 3,876 State 291 135 41 (498 ) (15,380 ) 3,917 Income tax expense (benefit) $ 1,236 $ (12,468 ) $ 12,852
Summary of Deferred Tax Assets (Liabilities)	Deferred tax (liabilities) assets were comprised of the following: (In thousands) December 31, 2018 2017 Deferred tax assets: Accrued expenses $ 704 $ 313 Allowance for doubtful accounts 267 208 Contract overrun reserves 1,263 294 Deferred compensation 302 177 Employment-related accruals 4,252 2,091 Environmental reserves 479 501 Federal tax credit carryforwards 288 5,613 Inventory reserves 1,757 1,315 Pension obligation 2,324 2,398 State net operating loss carryforwards 51 86 State tax credit carryforwards 9,075 9,051 Stock-based compensation 1,661 1,480 Workers’ compensation 51 75 Other 1,538 1,492 Total gross deferred tax assets 24,012 25,094 Valuation allowance (9,083 ) (9,013 ) Total gross deferred tax assets, net of valuation allowance 14,929 16,081 Deferred tax liabilities: Deferred revenue (649 ) — Depreciation (7,951 ) (7,976 ) Goodwill (3,963 ) (2,902 ) Intangibles (19,905 ) (20,611 ) Prepaid insurance (223 ) (312 ) Total gross deferred tax liabilities (32,691 ) (31,801 ) Net deferred tax liabilities $ (17,762 ) $ (15,720 )
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, 2018 2017 2016 Statutory federal income tax rate 21.0% 35.0% 35.0% State income taxes (net of federal benefit) 5.3 2.5 5.7 Qualified domestic production activities — (2.6) (2.0) Stock-based compensation expense (1.9) (8.2) — Research and development tax credits (32.0) (50.6) (8.6) Other tax credits (1.2) (7.5) — Changes in valuation allowance 0.7 10.6 0.9 Non-deductible book expenses 8.2 1.1 0.2 Changes in deferred tax assets 12.1 15.4 1.5 Re-measurement of deferred taxes for 2017 Tax Act — (171.3) — Changes in tax reserves 1.2 11.4 — Other (1.4) 0.4 1.0 Effective income tax (benefit) rate 12.0% (163.8)% 33.7%
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, 2018 2017 2016 Balance at January 1, $ 5,271 $ 3,036 $ 2,963 Additions for tax positions related to the current year 419 422 476 Additions for tax positions related to prior years 92 1,953 385 Reductions for tax positions related to prior years (499 ) (99 ) (567 ) Reductions for lapse of statute of limitations — (41 ) (221 ) Balance at December 31, $ 5,283 $ 5,271 $ 3,036

Major Customers and Concentra_2

Major Customers and Concentrations of Credit Risk (Tables)	12 Months Ended
	Dec. 31, 2018
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, 2018 2017 2016 Boeing 17.0 % 16.3 % 17.3 % Lockheed Martin 4.4 % 5.5 % 5.6 % Raytheon 11.7 % 13.5 % 8.4 % Spirit 9.5 % 8.2 % 8.2 % United Technologies 4.6 % 4.7 % 5.3 % Top ten customers (1) 62.9 % 62.5 % 58.7 % (1) Includes Boeing, Lockheed Martin, Raytheon, Spirit, and United Technologies. Boeing, Lockheed Martin, Raytheon, Spirit, and United Technologies represented the following percentages of total accounts receivable: December 31, 2018 2017 Boeing 8.0 % 7.8 % Lockheed Martin 2.5 % 5.9 % Raytheon 3.2 % 1.4 % Spirit — % 13.5 % United Technologies 2.5 % 2.3 %

Business Segment Information (T

Business Segment Information (Tables)	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Financial Information by Reportable Segment	Financial information by reportable segment was as follows: (In thousands) Years Ended December 31, 2018 2017 2016 Net Revenues Electronic Systems $ 337,868 $ 316,723 $ 304,177 Structural Systems 291,439 241,460 246,465 Total Net Revenues $ 629,307 $ 558,183 $ 550,642 Segment Operating Income (Loss) (2)(3) Electronic Systems $ 30,916 $ 31,236 $ 29,284 Structural Systems 19,063 5,790 16,844 49,979 37,026 46,128 Corporate General and Administrative Expenses (1)(2)(3) (26,061 ) (21,392 ) (16,912 ) Operating Income $ 23,918 $ 15,634 $ 29,216 Depreciation and Amortization Expenses Electronic Systems $ 14,223 $ 13,888 $ 14,087 Structural Systems 10,525 8,860 8,688 Corporate Administration 548 97 85 Total Depreciation and Amortization Expenses $ 25,296 $ 22,845 $ 22,860 Capital Expenditures Electronic Systems $ 6,719 $ 5,019 $ 3,032 Structural Systems 9,104 20,679 15,661 Corporate Administration 514 775 — Total Capital Expenditures $ 16,337 $ 26,473 $ 18,693 (1) Includes cost not allocated to either the Electronic Systems or Structural Systems operating segments. (2) The results for 2018 includes CTP’s results of operations which have been included in our consolidated statements of income since the date of acquisition as part of the Structural Systems segment. See Note 3. (3) The results for 2017 includes LDS’ results of operations which have been included in our consolidated statements of income since the date of acquisition as part of the Electronic Systems segment. See Note 3.
Segment Assets	Corporate assets include assets not specifically identified with a business segment, including cash. The following table summarizes our segment assets for 2018 and 2017 : (In thousands) December 31, 2018 2017 Total Assets Electronic Systems $ 405,743 $ 362,831 Structural Systems 226,304 193,600 Corporate Administration 16,096 10,322 Total Assets $ 648,143 $ 566,753 Goodwill and Intangibles Electronic Systems $ 219,872 $ 229,292 Structural Systems 28,277 2,836 Total Goodwill and Intangibles $ 248,149 $ 232,128

Supplemental Quarterly Financ_2

Supplemental Quarterly Financial Data (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information	(In thousands, except per share amounts) Three Months Ended 2018 Three Months Ended 2017 Dec 31 Sep 29 Jun 30 Mar 31 Dec 31 Sep 30 Jul 1 Apr 1 Net Revenues $ 164,183 $ 159,842 $ 154,827 $ 150,455 $ 142,258 $ 138,690 $ 140,938 $ 136,297 Gross Profit 32,697 31,116 32,028 26,755 25,772 26,087 26,269 25,005 Income (Loss) Before Taxes 1,791 4,290 1,833 2,357 (5,057 ) 5,595 4,564 2,507 Income Tax Expense (Benefit) 1,118 119 242 (243 ) (14,541 ) 940 741 392 Net Income $ 673 $ 4,171 $ 1,591 $ 2,600 $ 9,484 $ 4,655 $ 3,823 $ 2,115 Earnings Per Share Basic earnings per share $ 0.06 $ 0.37 $ 0.14 $ 0.23 $ 0.84 $ 0.41 $ 0.34 $ 0.19 Diluted earnings per share $ 0.06 $ 0.36 $ 0.14 $ 0.22 $ 0.82 $ 0.41 $ 0.33 $ 0.18

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	Jan. 01, 2018USD ($)	Dec. 31, 2018USD ($)Segment	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Significant Accounting Policies [Line Items]
Number of reportable segments | Segment		2
Cash equivalent maturity period		three months or less
Interest rate cap hedges recognized in other comprehensive income, net of tax		$ 407	$ (242)	$ (305)
Loss on derivative		300
Production cost of contracts		11,679	11,204
Goodwill		136,057	117,435
Remaining performance obligation, amount		$ 722,800
Remaining performance obligation, percentage		70.00%
Tax Cuts And Jobs Act of 2017, deferred Income tax benefit		$ 13,000
Adoption of 2017 Tax Cuts and Jobs Act		$ 26
Minimum
Significant Accounting Policies [Line Items]
Estimated useful life of intangible assets (in years)		10 years
Income tax benefit percentage		50.00%
Maximum
Significant Accounting Policies [Line Items]
Estimated useful life of intangible assets (in years)		18 years
Structural Systems
Significant Accounting Policies [Line Items]
Goodwill		$ 18,622	0
Electronic Systems
Significant Accounting Policies [Line Items]
Goodwill		117,435	$ 117,435
Accounting Standards Update 2014-09
Significant Accounting Policies [Line Items]
Cumulative effect on retained earnings, net of tax	$ 8,700
Other Assets
Significant Accounting Policies [Line Items]
Interest rate cap hedge premium		300
Other Current Assets | Accounting Standards Update 2018-15
Significant Accounting Policies [Line Items]
Capitalized implementation costs		200
Accumulated Other Comprehensive Loss
Significant Accounting Policies [Line Items]
Adoption of 2017 Tax Cuts and Jobs Act		$ 1,318

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Supplemental Cash Flow Information [Abstract]
Interest paid	$ 11,573	$ 7,307	$ 6,877
Taxes paid	316	3,125	9,778
Non-cash activities:
Purchases of property and equipment not paid	$ 824	$ 2,104	$ 3,241

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Contact Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Contract assets	$ 86,665	$ 68,739	$ 0
Contract liabilities	$ 17,145	$ 24,460	$ 0

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Change in revenue for the period									$ 71,124
Revenues	$ 164,183	$ 159,842	$ 154,827	$ 150,455	$ 142,258	$ 138,690	$ 140,938	$ 136,297	$ 629,307	$ 558,183	$ 550,642
Percentage of revenues									100.00%	100.00%
Electronic Systems
Disaggregation of Revenue [Line Items]
Change in revenue for the period									$ 21,145
Revenues									$ 337,868	$ 316,723
Percentage of revenues									100.00%	100.00%
Structural Systems
Disaggregation of Revenue [Line Items]
Change in revenue for the period									$ 49,979
Revenues									$ 291,439	$ 241,460
Percentage of revenues									100.00%	100.00%
Military and space
Disaggregation of Revenue [Line Items]
Change in revenue for the period									$ 8,901
Revenues									$ 276,659	$ 267,758
Percentage of revenues									44.00%	48.00%
Military and space | Electronic Systems
Disaggregation of Revenue [Line Items]
Change in revenue for the period									$ 3,684
Revenues									$ 214,786	$ 211,102
Percentage of revenues									63.60%	66.60%
Military and space | Structural Systems
Disaggregation of Revenue [Line Items]
Change in revenue for the period									$ 5,217
Revenues									$ 61,873	$ 56,656
Percentage of revenues									21.20%	23.50%
Commercial aerospace
Disaggregation of Revenue [Line Items]
Change in revenue for the period									$ 68,101
Revenues									$ 304,455	$ 236,354
Percentage of revenues									48.40%	42.30%
Commercial aerospace | Electronic Systems
Disaggregation of Revenue [Line Items]
Change in revenue for the period									$ 23,339
Revenues									$ 74,889	$ 51,550
Percentage of revenues									22.20%	16.30%
Commercial aerospace | Structural Systems
Disaggregation of Revenue [Line Items]
Change in revenue for the period									$ 44,762
Revenues									$ 229,566	$ 184,804
Percentage of revenues									78.80%	76.50%
Industrial
Disaggregation of Revenue [Line Items]
Change in revenue for the period									$ (5,878)
Revenues									$ 48,193	$ 54,071
Percentage of revenues									7.60%	9.70%
Industrial | Electronic Systems
Disaggregation of Revenue [Line Items]
Change in revenue for the period									$ (5,878)
Revenues									$ 48,193	$ 54,071
Percentage of revenues									14.20%	17.10%

Summary of Significant Accoun_8

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, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounting Policies [Abstract]
Net Income	$ 673	$ 4,171	$ 1,591	$ 2,600	$ 9,484	$ 4,655	$ 3,823	$ 2,115	$ 9,035	$ 20,077	$ 25,261
Weighted-average number of common shares outstanding
Basic weighted-average common shares outstanding (in shares)									11,390	11,290	11,151
Dilutive potential common shares (in shares)									269	268	148
Diluted weighted-average common shares outstanding (in shares)									11,659	11,558	11,299
Earnings Per Share
Basic earnings (loss) per share (in dollars per share)	$ 0.06	$ 0.37	$ 0.14	$ 0.23	$ 0.84	$ 0.41	$ 0.34	$ 0.19	$ 0.79	$ 1.78	$ 2.27
Diluted earnings (loss) per share (in dollars per share)	$ 0.06	$ 0.36	$ 0.14	$ 0.22	$ 0.82	$ 0.41	$ 0.33	$ 0.18	$ 0.77	$ 1.74	$ 2.24

Summary of Significant Accoun_9

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock Options And Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options and stock units	208	126	553

Adoption of Accounting Standa_3

Adoption of Accounting Standards Codification 606 - Balance Sheet (Details) - USD ($) $ / shares in Units, $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current Assets
Cash and cash equivalents	$ 10,263		$ 2,150	$ 7,432	$ 5,454
Accounts receivable, net of allowance for doubtful accounts of $1,135 at December 31, 2018	67,819		74,064
Contract assets	86,665	$ 68,739	0
Inventories	101,125	83,159	122,161
Production cost of contracts	11,679		11,204
Other current assets	9,839		11,435
Total Current Assets	287,390		221,014
Property and Equipment, Net	107,045		110,252
Goodwill	136,057		117,435
Intangibles, Net	112,092		114,693
Non-Current Deferred Income Taxes	308	166	261
Other Assets	5,251		3,098
Total Assets	648,143		566,753
Current Liabilities
Accounts payable	69,274		51,907
Contract liabilities	17,145	24,460	0
Accrued liabilities	37,786	22,238	28,329
Current portion of long-term debt	2,330		0
Total Current Liabilities	126,535		80,236
Long-Term Debt, Less Current Portion	226,961		216,055
Non-Current Deferred Income Taxes	18,070	18,589	15,981
Other Long-Term Liabilities	19,752		18,898
Total Liabilities	391,318		331,170
Commitments and Contingencies (Notes 13, 16)
Equity [Abstract]
Common stock - $0.01 par value; 35,000,000 shares authorized; 11,417,863 and 11,332,841 shares issued and outstanding at December 31, 2018 and 2017, respectively	114		113
Additional paid-in capital	83,712		80,223
Retained earnings	180,356	170,029	161,364
Accumulated other comprehensive loss	(7,357)		(6,117)
Total Shareholders’ Equity	256,825		235,583	$ 212,103	$ 185,734
Total Liabilities and Shareholders’ Equity	648,143		566,753
Accounts receivable, allowance for doubtful accounts	1,135		868
Less accumulated depreciation	$ 154,840		$ 143,216
Common stock, par value (in dollars per share)	$ 0.01		$ 0.01
Common stock, shares authorized (in shares)	35,000,000		35,000,000
Common stock, shares issued (in shares)	11,417,863		11,332,841
Common Stock, shares outstanding (in shares)	11,417,863		11,332,841
Calculated under Revenue Guidance in Effect before Topic 606
Current Assets
Cash and cash equivalents	$ 10,263		$ 2,150
Accounts receivable, net of allowance for doubtful accounts of $1,135 at December 31, 2018	67,819
Contract assets	0		0
Inventories	158,652		122,161
Production cost of contracts	11,679
Other current assets	10,924
Total Current Assets	259,337
Property and Equipment, Net	107,045
Goodwill	136,057
Intangibles, Net	112,092
Non-Current Deferred Income Taxes	316		261
Other Assets	5,251
Total Assets	620,098
Current Liabilities
Accounts payable	69,274
Contract liabilities	0		0
Accrued liabilities	42,780		28,329
Current portion of long-term debt	2,330
Total Current Liabilities	114,384
Long-Term Debt, Less Current Portion	226,961
Non-Current Deferred Income Taxes	15,500		15,981
Other Long-Term Liabilities	19,752
Total Liabilities	376,597
Equity [Abstract]
Common stock - $0.01 par value; 35,000,000 shares authorized; 11,417,863 and 11,332,841 shares issued and outstanding at December 31, 2018 and 2017, respectively	114
Additional paid-in capital	83,712
Retained earnings	167,032		161,364
Accumulated other comprehensive loss	(7,357)
Total Shareholders’ Equity	243,501
Total Liabilities and Shareholders’ Equity	620,098
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Current Assets
Cash and cash equivalents	0		$ 0
Accounts receivable, net of allowance for doubtful accounts of $1,135 at December 31, 2018	0
Contract assets	(86,665)	68,739
Inventories	57,527	(39,002)
Production cost of contracts	0
Other current assets	1,085
Total Current Assets	(28,053)
Property and Equipment, Net	0
Goodwill	0
Intangibles, Net	0
Non-Current Deferred Income Taxes	8	(95)
Other Assets	0
Total Assets	(28,045)
Current Liabilities
Accounts payable	0
Contract liabilities	(17,145)	24,460
Accrued liabilities	4,994	(6,091)
Current portion of long-term debt	0
Total Current Liabilities	(12,151)
Long-Term Debt, Less Current Portion	0
Non-Current Deferred Income Taxes	(2,570)	2,608
Other Long-Term Liabilities	0
Total Liabilities	(14,721)
Equity [Abstract]
Common stock - $0.01 par value; 35,000,000 shares authorized; 11,417,863 and 11,332,841 shares issued and outstanding at December 31, 2018 and 2017, respectively	0
Additional paid-in capital	0
Retained earnings	(13,324)	$ 8,665
Accumulated other comprehensive loss	0
Total Shareholders’ Equity	(13,324)
Total Liabilities and Shareholders’ Equity	$ (28,045)

Adoption of Accounting Standa_4

Adoption of Accounting Standards Codification 606 - Income Statement (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Revenues	$ 164,183	$ 159,842	$ 154,827	$ 150,455	$ 142,258	$ 138,690	$ 140,938	$ 136,297	$ 629,307	$ 558,183	$ 550,642
Cost of Sales									506,711	455,050	444,102
Gross Profit	32,697	31,116	32,028	26,755	25,772	26,087	26,269	25,005	122,596	103,133	106,540
Selling, General and Administrative Expenses									84,007	79,139	77,142
Restructuring Charges	3,800	3,400	5,400	2,200	8,800				14,671	8,360	182
Operating Income									23,918	15,634	29,216
Interest Expense									(13,024)	(8,870)	(8,922)
Loss on Extinguishment of Debt									(926)	0	0
Other Income, Net									303	845	215
Income Before Taxes	1,791	4,290	1,833	2,357	(5,057)	5,595	4,564	2,507	10,271	7,609	38,113
Income Tax Expense (Benefit)	1,118	119	242	(243)	(14,541)	940	741	392	1,236	(12,468)	12,852
Net Income	$ 673	$ 4,171	$ 1,591	$ 2,600	$ 9,484	$ 4,655	$ 3,823	$ 2,115	$ 9,035	$ 20,077	$ 25,261
Earnings Per Share
Basic earnings per share (in dollars per share)	$ 0.06	$ 0.37	$ 0.14	$ 0.23	$ 0.84	$ 0.41	$ 0.34	$ 0.19	$ 0.79	$ 1.78	$ 2.27
Diluted earnings per share (in dollars per share)	$ 0.06	$ 0.36	$ 0.14	$ 0.22	$ 0.82	$ 0.41	$ 0.33	$ 0.18	$ 0.77	$ 1.74	$ 2.24
Weighted-Average Number of Shares Outstanding
Basic (in shares)									11,390	11,290	11,151
Diluted (in shares)									11,659	11,558	11,299
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Revenues									$ (15,712)
Cost of Sales									(11,458)
Gross Profit									(4,254)
Selling, General and Administrative Expenses									0
Restructuring Charges									0
Operating Income									(4,254)
Interest Expense									(1,526)
Loss on Extinguishment of Debt									0
Other Income, Net									0
Income Before Taxes									(5,780)
Income Tax Expense (Benefit)									(1,120)
Net Income									(4,660)
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Revenues									613,595
Cost of Sales									495,253
Gross Profit									118,342
Selling, General and Administrative Expenses									84,007
Restructuring Charges									14,671
Operating Income									19,664
Interest Expense									(14,550)
Loss on Extinguishment of Debt									(926)
Other Income, Net									303
Income Before Taxes									4,491
Income Tax Expense (Benefit)									116
Net Income									$ 4,375
Earnings Per Share
Basic earnings per share (in dollars per share)									$ 0.38
Diluted earnings per share (in dollars per share)									$ 0.38

Adoption of Accounting Standa_5

Adoption of Accounting Standards Codification 606 - Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Income	$ 673	$ 4,171	$ 1,591	$ 2,600	$ 9,484	$ 4,655	$ 3,823	$ 2,115	$ 9,035	$ 20,077	$ 25,261
Pension Adjustments:
Amortization of actuarial losses included in net income, net of tax benefit of $173, $302, and $283 for 2018, 2017, and 2016, respectively									570	508	479
Actuarial loss arising during the period, net of tax benefit of $302, for the year ended December 31, 2018									(899)	(304)	(650)
Interest rate cap hedges recognized in other comprehensive income, net of tax									407	(242)	(305)
Other Comprehensive (Loss) Income, Net of Tax									78	(38)	(476)
Comprehensive Income, Net of Tax									9,113	20,039	24,785
Amortization of actuarial (loss) gain, tax									(173)	(302)	(283)
Actuarial gain (loss) arising during the period, tax expense (benefit)									302	194	413
Unrealized gain (loss) on cash flow hedges, tax									121	$ (145)	$ (180)
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Income									(4,660)
Pension Adjustments:
Amortization of actuarial losses included in net income, net of tax benefit of $173, $302, and $283 for 2018, 2017, and 2016, respectively									0
Actuarial loss arising during the period, net of tax benefit of $302, for the year ended December 31, 2018									0
Interest rate cap hedges recognized in other comprehensive income, net of tax									0
Other Comprehensive (Loss) Income, Net of Tax									0
Comprehensive Income, Net of Tax									(4,660)
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Income									4,375
Pension Adjustments:
Amortization of actuarial losses included in net income, net of tax benefit of $173, $302, and $283 for 2018, 2017, and 2016, respectively									570
Actuarial loss arising during the period, net of tax benefit of $302, for the year ended December 31, 2018									(899)
Interest rate cap hedges recognized in other comprehensive income, net of tax									407
Other Comprehensive (Loss) Income, Net of Tax									78
Comprehensive Income, Net of Tax									$ 4,453

Adoption of Accounting Standa_6

Adoption of Accounting Standards Codification 606 - Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Income	$ 673	$ 4,171	$ 1,591	$ 2,600	$ 9,484	$ 4,655	$ 3,823	$ 2,115	$ 9,035	$ 20,077	$ 25,261
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Depreciation and amortization									25,296	22,845	22,860
Property and equipment impairment due to restructuring									6,207	3,607	0
Stock-based compensation expense									5,040	4,675	3,007
Deferred income taxes									2,042	(15,411)	3,519
Provision for doubtful accounts									267	373	112
Noncash loss on extinguishment of debt									926	0	0
Other									11,659	(1,182)	(7,204)
Changes in Assets and Liabilities:
Accounts receivable									7,495	2,720	3,220
Contract assets									(86,665)	0	0
Inventories									23,243	(533)	(5,182)
Production cost of contracts									(1,569)	(267)	(1,536)
Other assets									1,881	40	2,974
Accounts payable									18,496	(4,015)	15,055
Contract liabilities									17,145	0	0
Accrued and other liabilities									5,739	2,505	(966)
Net Cash Provided by Operating Activities									46,237	35,434	43,268
Cash Flows from Investing Activities
Purchases of property and equipment									(17,617)	(27,610)	(17,001)
Proceeds from sale of assets									396	913	16
Payments for acquisition of Certified Thermoplastics Co., LLC, net of cash acquired									(30,712)	0	0
Net Cash (Used in) Provided by Investing Activities									(47,933)	(86,207)	34,908
Cash Flows from Financing Activities
Borrowings from senior secured revolving credit facility									296,400	395,900	71,800
Repayment of senior secured revolving credit facility									(354,500)	(337,800)	(71,800)
Borrowings from term loan									240,000	0	0
Repayments of term loan									(167,000)	(10,000)	(75,000)
Debt issuance costs									(3,541)	0	0
Net cash paid from issuance of common stock under stock plans									(1,550)	(2,606)	(1,423)
Net Cash Provided by (Used in) Financing Activities									9,809	45,491	(76,198)
Net (Decrease) Increase in Cash and Cash Equivalents									8,113	(5,282)	1,978
Cash and Cash Equivalents at Beginning of Year				2,150				$ 7,432	2,150	7,432	5,454
Cash and Cash Equivalents at End of Year	10,263				2,150				10,263	2,150	$ 7,432
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Income									(4,660)
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Depreciation and amortization									0
Property and equipment impairment due to restructuring									0
Stock-based compensation expense									0
Deferred income taxes									(2,578)
Provision for doubtful accounts									0
Noncash loss on extinguishment of debt									0
Other									(8,364)
Changes in Assets and Liabilities:
Accounts receivable									0
Contract assets									86,665
Inventories									(57,527)
Production cost of contracts									0
Other assets									(1,084)
Accounts payable									0
Contract liabilities									(17,145)
Accrued and other liabilities									4,693
Net Cash Provided by Operating Activities									0
Cash Flows from Investing Activities
Purchases of property and equipment									0
Proceeds from sale of assets									0
Payments for acquisition of Certified Thermoplastics Co., LLC, net of cash acquired									0
Net Cash (Used in) Provided by Investing Activities									0
Cash Flows from Financing Activities
Borrowings from senior secured revolving credit facility									0
Repayment of senior secured revolving credit facility									0
Borrowings from term loan									0
Repayments of term loan									0
Debt issuance costs									0
Net cash paid from issuance of common stock under stock plans									0
Net Cash Provided by (Used in) Financing Activities									0
Net (Decrease) Increase in Cash and Cash Equivalents									0
Cash and Cash Equivalents at Beginning of Year				0					0
Cash and Cash Equivalents at End of Year	0				0				0	0
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Income									4,375
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Depreciation and amortization									25,296
Property and equipment impairment due to restructuring									6,207
Stock-based compensation expense									5,040
Deferred income taxes									(536)
Provision for doubtful accounts									267
Noncash loss on extinguishment of debt									926
Other									3,295
Changes in Assets and Liabilities:
Accounts receivable									7,495
Contract assets									0
Inventories									(34,284)
Production cost of contracts									(1,569)
Other assets									797
Accounts payable									18,496
Contract liabilities									0
Accrued and other liabilities									10,432
Net Cash Provided by Operating Activities									46,237
Cash Flows from Investing Activities
Purchases of property and equipment									(17,617)
Proceeds from sale of assets									396
Payments for acquisition of Certified Thermoplastics Co., LLC, net of cash acquired									(30,712)
Net Cash (Used in) Provided by Investing Activities									(47,933)
Cash Flows from Financing Activities
Borrowings from senior secured revolving credit facility									296,400
Repayment of senior secured revolving credit facility									(354,500)
Borrowings from term loan									240,000
Repayments of term loan									(167,000)
Debt issuance costs									(3,541)
Net cash paid from issuance of common stock under stock plans									(1,550)
Net Cash Provided by (Used in) Financing Activities									9,809
Net (Decrease) Increase in Cash and Cash Equivalents									8,113
Cash and Cash Equivalents at Beginning of Year				$ 2,150					2,150
Cash and Cash Equivalents at End of Year	$ 10,263				$ 2,150				$ 10,263	$ 2,150

Adoption of Accounting Standa_7

Adoption of Accounting Standards Codification 606 - Changes in Shareholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Income	$ 673	$ 4,171	$ 1,591	$ 2,600	$ 9,484	$ 4,655	$ 3,823	$ 2,115	$ 9,035	$ 20,077	$ 25,261
Other comprehensive income (loss), net of tax									78	(38)	(476)
Adoption of ASC 606 adjustment												$ 8,665
Adoption of ASU 2018-02 adjustment									(26)
Stock options exercised									1,822	4,336	2,122
Stock repurchased related to the exercise of stock options									(6,345)	(6,904)	(3,465)
Stock awards vested									2,973	0	0
Stock-based compensation									5,040	$ 6,009	$ 3,007
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Income									(4,660)
Other comprehensive income (loss), net of tax									0
Adoption of ASC 606 adjustment												(8,665)
Adoption of ASU 2018-02 adjustment									0
Stock options exercised									0
Stock repurchased related to the exercise of stock options									0
Stock awards vested									0
Stock-based compensation									0
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Income									4,375
Other comprehensive income (loss), net of tax									78
Adoption of ASC 606 adjustment												$ 0
Adoption of ASU 2018-02 adjustment									(26)
Stock options exercised									1,822
Stock repurchased related to the exercise of stock options									(6,345)
Stock awards vested									2,973
Stock-based compensation									$ 5,040

Business Combinations - Narrati

Business Combinations - Narrative (Details) - USD ($) $ in Thousands	Apr. 23, 2018	Sep. 11, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2018
Business Acquisition [Line Items]
Purchase price, net of cash acquired				$ 0	$ 59,798	$ 0
Goodwill				136,057	$ 117,435
Certified Thermoplastics Co., LLC
Business Acquisition [Line Items]
Equity interest acquired	100.00%						100.00%
Purchase price, net of cash acquired	$ 30,700
Gross purchase price	30,810
Intangible assets	8,100
Goodwill	18,622
Cash	98
Inventories	2,207
Accounts receivable	1,517
Property and equipment	603
Other current assets	27
Total liabilities assumed	364
Lightning Diversion Systems, Inc.
Business Acquisition [Line Items]
Equity interest acquired		100.00%	100.00%
Purchase price, net of cash acquired		$ 60,000	$ 60,000
Gross purchase price		$ 62,000	62,000
Intangible assets			22,400
Goodwill			34,900
Cash			2,200
Inventories			1,700
Accounts receivable			900
Property and equipment			100
Other current assets			100
Total liabilities assumed			300
Selling, General and Administrative Expenses
Business Acquisition [Line Items]
Acquisition related costs				$ 600
Customer relationships
Business Acquisition [Line Items]
Estimated useful life of intangible assets (in years)				17 years
Customer relationships | Certified Thermoplastics Co., LLC
Business Acquisition [Line Items]
Intangible assets	$ 6,900
Estimated useful life of intangible assets (in years)	10 years
Customer relationships | Lightning Diversion Systems, Inc.
Business Acquisition [Line Items]
Intangible assets			$ 21,100
Estimated useful life of intangible assets (in years)			15 years
Trade Names
Business Acquisition [Line Items]
Estimated useful life of intangible assets (in years)				13 years
Trade Names | Lightning Diversion Systems, Inc.
Business Acquisition [Line Items]
Intangible assets			$ 1,300
Estimated useful life of intangible assets (in years)			15 years

Business Combinations - Fair Va

Business Combinations - Fair Value of Assets and Liabilities Acquired (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Apr. 23, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 136,057		$ 117,435
Certified Thermoplastics Co., LLC
Business Acquisition [Line Items]
Cash		$ 98
Accounts receivable		1,517
Inventories		2,207
Other current assets		27
Property and equipment		603
Intangible assets		8,100
Goodwill		18,622
Total assets acquired		31,174
Current liabilities		(364)
Total liabilities assumed		(364)
Total purchase price allocation		$ 30,810

Business Combinations - Estimat

Business Combinations - Estimated Fair Value of Intangible Assets Acquired (Details) - USD ($) $ in Thousands	Apr. 23, 2018	Dec. 31, 2018
Certified Thermoplastics Co., LLC
Business Acquisition [Line Items]
Intangible assets	$ 8,100
Customer relationships
Business Acquisition [Line Items]
Useful Life (In years)		17 years
Customer relationships | Certified Thermoplastics Co., LLC
Business Acquisition [Line Items]
Useful Life (In years)	10 years
Intangible assets	$ 6,900
Trade names and trademarks | Certified Thermoplastics Co., LLC
Business Acquisition [Line Items]
Useful Life (In years)	10 years
Intangible assets	$ 1,200

Restructuring Activities (Detai

Restructuring Activities (Detail) - USD ($) $ in Thousands	3 Months Ended					12 Months Ended			14 Months Ended
	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018
Restructuring Reserve [Roll Forward]
Charges	$ 3,800	$ 3,400	$ 5,400	$ 2,200	$ 8,800	$ 14,671	$ 8,360	$ 182
Electronic Systems
Restructuring Cost and Reserve [Line Items]
Inventory Write-down						100
Accrued severance and loss on early exit	2,800					2,800			$ 2,800
Restructuring Reserve [Roll Forward]
Charges						2,600
Electronic Systems | Severance and benefits
Restructuring Reserve [Roll Forward]
Charges						3,800
Electronic Systems | Lease termination
Restructuring Reserve [Roll Forward]
Charges						900
Electronic Systems | Other
Restructuring Reserve [Roll Forward]
Charges						900
Electronic Systems | Professional service fees
Restructuring Reserve [Roll Forward]
Charges						200
Electronic Systems | Property and equipment impairment due to restructuring
Restructuring Reserve [Roll Forward]
Non-Cash Payments						(100)
Structural Systems
Restructuring Cost and Reserve [Line Items]
Inventory Write-down						500
Accrued severance and loss on early exit	900					900			900
Restructuring Reserve [Roll Forward]
Charges						1,300
Non-Cash Payments						(6,200)
Structural Systems | Severance and benefits
Restructuring Reserve [Roll Forward]
Charges						3,000
Structural Systems | Other
Restructuring Reserve [Roll Forward]
Charges						400
Structural Systems | Property and equipment impairment due to restructuring
Restructuring Reserve [Roll Forward]
Non-Cash Payments						(9,800)
Restructuring Plan, 2017
Restructuring Reserve [Roll Forward]
Beginning balance				2,725		2,725
Charges						14,792	8,800		23,600
Cash Payments						(6,433)
Non-Cash Payments						(6,312)
Change in Estimates						(771)
Ending balance	4,001				2,725	4,001	2,725		4,001
Restructuring Plan, 2017 | Severance and benefits
Restructuring Reserve [Roll Forward]
Beginning balance				2,659		2,659
Charges						5,018
Cash Payments						(4,346)
Non-Cash Payments						0
Change in Estimates						(700)
Ending balance	2,631				2,659	2,631	2,659		2,631
Restructuring Plan, 2017 | Lease termination
Restructuring Reserve [Roll Forward]
Beginning balance				66		66
Charges						864
Cash Payments						(69)
Non-Cash Payments						0
Change in Estimates						0
Ending balance	861				66	861	66		861
Restructuring Plan, 2017 | Other
Restructuring Reserve [Roll Forward]
Beginning balance				0		0
Charges						1,312
Cash Payments						(896)
Non-Cash Payments						0
Change in Estimates						0
Ending balance	416				0	416	0		416
Restructuring Plan, 2017 | Professional service fees
Restructuring Reserve [Roll Forward]
Beginning balance				0		0
Charges						1,165
Cash Payments						(1,122)
Non-Cash Payments						0
Change in Estimates						0
Ending balance	43				0	43	0		43
Restructuring Plan, 2017 | Property and equipment impairment due to restructuring
Restructuring Reserve [Roll Forward]
Beginning balance				0		0
Charges						6,207
Cash Payments						0
Non-Cash Payments						(6,207)
Change in Estimates						0
Ending balance	0				0	0	0		0
Restructuring Plan, 2017 | Modification of stock-based compensation awards
Restructuring Reserve [Roll Forward]
Beginning balance				0		0
Charges						105
Cash Payments						0
Non-Cash Payments						(105)
Change in Estimates						0
Ending balance	0				0	0	0		0
Restructuring Plan, 2017 | Inventory reserve
Restructuring Reserve [Roll Forward]
Beginning balance				0		0
Charges						121
Cash Payments						0
Non-Cash Payments						0
Change in Estimates						(71)
Ending balance	50				0	50	0		50
Restructuring Charges | Restructuring Plan, 2017
Restructuring Reserve [Roll Forward]
Beginning balance				2,725		2,725
Charges						14,671
Cash Payments						(6,433)
Non-Cash Payments						(6,312)
Change in Estimates						(700)
Ending balance	3,951				2,725	3,951	2,725		3,951
Cost of Sales | Restructuring Plan, 2017
Restructuring Reserve [Roll Forward]
Beginning balance				$ 0		0
Charges						121
Cash Payments						0
Non-Cash Payments						0
Change in Estimates						(71)
Ending balance	50				$ 0	50	$ 0		50
Corporate Segment
Restructuring Cost and Reserve [Line Items]
Accrued severance and loss on early exit	$ 300					300			$ 300
Restructuring Reserve [Roll Forward]
Charges						1,000
Non-Cash Payments						(100)
Corporate Segment | Severance and benefits
Restructuring Reserve [Roll Forward]
Charges						1,400
Corporate Segment | Professional service fees
Restructuring Reserve [Roll Forward]
Charges						1,000
Corporate Segment | Modification of stock-based compensation awards
Restructuring Reserve [Roll Forward]
Non-Cash Payments						$ (1,400)

Inventories (Detail)

Inventories (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Raw materials and supplies	$ 89,767		$ 65,221
Work in process	9,199		62,584
Finished goods	2,159		10,665
Total inventory, gross	101,125		138,470
Less progress payments	0		16,309
Total	$ 101,125	$ 83,159	$ 122,161

Property and Equipment, Net (De

Property and Equipment, Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 261,885	$ 253,468
Less accumulated depreciation	154,840	143,216
Total	107,045	110,252
Depreciation expense	13,500	13,200	$ 13,300
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	$ 57,642	57,024
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	$ 160,163	146,175
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	$ 19,676	21,127
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	$ 8,742	$ 13,480

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets - Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Gross goodwill		$ 199,157
Accumulated goodwill impairment		(81,722)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 117,435
Goodwill, Acquired During Period	18,622
Goodwill, ending balance	136,057
Electronic Systems
Goodwill [Line Items]
Gross goodwill		199,157
Accumulated goodwill impairment		(81,722)
Goodwill [Roll Forward]
Goodwill, beginning balance	117,435
Goodwill, Acquired During Period	0
Goodwill, ending balance	117,435
Structural Systems
Goodwill [Line Items]
Gross goodwill		0
Accumulated goodwill impairment		$ 0
Goodwill [Roll Forward]
Goodwill, beginning balance	0
Goodwill, Acquired During Period	18,622
Goodwill, ending balance	$ 18,622

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	Apr. 23, 2018	Sep. 11, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2018
Goodwill And Intangible Assets [Line Items]
Goodwill				$ 136,057	$ 117,435
Purchase price, net of cash acquired				0	59,798	$ 0
Amortization expense of intangible asset				$ 10,700	9,300	$ 9,000
Minimum
Goodwill And Intangible Assets [Line Items]
Acquired intangible assets amortization period				10 years
Maximum
Goodwill And Intangible Assets [Line Items]
Acquired intangible assets amortization period				18 years
Certified Thermoplastics Co., LLC
Goodwill And Intangible Assets [Line Items]
Goodwill	$ 18,622
Equity interest acquired	100.00%						100.00%
Purchase price, net of cash acquired	$ 30,700
Gross purchase price	$ 30,810
Lightning Diversion Systems, Inc.
Goodwill And Intangible Assets [Line Items]
Goodwill			$ 34,900
Equity interest acquired		100.00%	100.00%
Purchase price, net of cash acquired		$ 60,000	$ 60,000
Gross purchase price		$ 62,000	$ 62,000
Structural Systems
Goodwill And Intangible Assets [Line Items]
Goodwill				$ 18,622	0
Electronic Systems
Goodwill And Intangible Assets [Line Items]
Goodwill				$ 117,435	$ 117,435

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets - Carrying Amount of Finite-lived and Other Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 191,945	$ 183,845
Accumulated Amortization	79,853	69,152
Net Carrying Amount	112,092	114,693
Electronic Systems
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	164,545	164,545
Accumulated Amortization	62,108	52,688
Net Carrying Amount	102,437	111,857
Structural Systems
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	27,400	19,300
Accumulated Amortization	17,745	16,464
Net Carrying Amount	$ 9,655	2,836
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets (in years)	17 years
Gross Carrying Amount	$ 187,200	180,300
Accumulated Amortization	77,824	67,449
Net Carrying Amount	$ 109,376	112,851
Trade Names
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets (in years)	13 years
Gross Carrying Amount	$ 2,500	1,300
Accumulated Amortization	193	26
Net Carrying Amount	$ 2,307	1,274
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	1,625	1,493
Net Carrying Amount	$ 220	352
Technology
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets (in years)	15 years
Gross Carrying Amount	$ 400	400
Accumulated Amortization	211	184
Net Carrying Amount	$ 189	$ 216

Goodwill and Other Intangible_6

Goodwill and Other Intangible Assets - Future Amortization Expense of Other Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2,019	$ 10,820
2,020	10,648
2,021	10,478
2,022	10,418
2,023	10,359
Thereafter	59,369
Net Carrying Amount	112,092	$ 114,693
Electronic Systems
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2,019	9,419
2,020	9,348
2,021	9,287
2,022	9,288
2,023	9,287
Thereafter	55,808
Net Carrying Amount	102,437	111,857
Structural Systems
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2,019	1,401
2,020	1,300
2,021	1,191
2,022	1,130
2,023	1,072
Thereafter	3,561
Net Carrying Amount	$ 9,655	$ 2,836

Accrued Liabilities (Detail)

Accrued Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Accrued compensation	$ 29,616		$ 18,925
Accrued income tax and sales tax	82		71
Customer deposits	0		3,970
Provision for forward loss reserves	0		1,226
Other	8,088		4,137
Total	$ 37,786	$ 22,238	$ 28,329

Long-Term Debt - Summary (Detai

Long-Term Debt - Summary (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term debt, gross	$ 233,000	$ 218,100
Less current portion	2,330	0
Total long-term debt	230,670	218,100
Less debt issuance costs	3,709	2,045
Total long-term debt, net of debt issuance costs	$ 226,961	$ 216,055
Weighted-average interest rate (percent)	4.71%	3.73%
Term Loan
Debt Instrument [Line Items]
Long-term debt, gross	$ 233,000	$ 160,000
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	$ 58,100

Long-Term Debt - Future Long-Te

Long-Term Debt - Future Long-Term Debt Payment (Detail) $ in Thousands	Dec. 31, 2018USD ($)
Long-term Debt, Fiscal Year Maturity [Abstract]
2,019	$ 2,330
2,020	2,330
2,021	2,330
2,022	2,330
2,023	2,330
Thereafter	221,350
Total Debt	$ 233,000

Long-Term Debt - Additional inf

Long-Term Debt - Additional information (Detail) - USD ($)	Nov. 21, 2018	Apr. 23, 2018	Sep. 11, 2017	Oct. 31, 2017	Sep. 30, 2017	Oct. 31, 2015	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Repayments of debt							$ 0	$ 3,000	$ 23,000
Loss on Extinguishment of Debt							926,000	0	0
Purchase price, net of cash acquired							0	59,798,000	0
Interest rate cap premiums
Debt Instrument [Line Items]
Hedging asset						$ 135,000,000
Payments for hedging asset						$ 1,000,000
New Term Loan
Debt Instrument [Line Items]
Debt issuance costs, net							1,700,000
Debt issuance costs							1,800,000
Accumulated Amortization of Debt Issuance Costs, Line of Credit Arrangements							$ 100,000
Term of debt instrument							7 years
New Revolving Credit Facility
Debt Instrument [Line Items]
Debt issuance costs, net							$ 1,800,000
Debt issuance costs							2,000,000
Accumulated Amortization of Debt Issuance Costs, Line of Credit Arrangements							$ 200,000
Term of debt instrument							5 years
New Credit Facilities
Debt Instrument [Line Items]
Debt issuance costs, net							$ 3,500,000
New Existing Revolving Credit Facility
Debt Instrument [Line Items]
Amortization of debt issuance costs	$ 500,000
Loss on Extinguishment of Debt							900,000
Existing Term Loan
Debt Instrument [Line Items]
Amortization of debt issuance costs	400,000
Parsons, KS | Municipal Bonds
Debt Instrument [Line Items]
Purchase of industrial revenue bonds							2,200,000	14,200,000	9,900,000
Parsons, KS
Debt Instrument [Line Items]
Proceeds received from sale of property to be leased back							2,200,000	14,200,000	9,900,000
Total lease liability from assets sold							2,200,000	$ 14,200,000	$ 9,900,000
Certified Thermoplastics Co., LLC
Debt Instrument [Line Items]
Purchase price, net of cash acquired		$ 30,700,000
Payments to acquire business		$ 30,800,000
Lightning Diversion Systems, Inc.
Debt Instrument [Line Items]
Purchase price, net of cash acquired			$ 60,000,000		$ 60,000,000
Payments to acquire business			$ 61,400,000	$ 600,000
Secured Debt | New Term Loan
Debt Instrument [Line Items]
Face amount of instrument	$ 240,000,000
Prepayment percentage of principal	0.25%
Proceeds from lines of credit	$ 240,000,000
Secured Debt | New Term Loan | Federal Funds Rate
Debt Instrument [Line Items]
Fixed rate spread (percent)	0.50%
Secured Debt | New Term Loan | Eurodollar Rate
Debt Instrument [Line Items]
Fixed rate spread (percent)	1.00%
Secured Debt | New Term Loan | Minimum | LIBOR Rate
Debt Instrument [Line Items]
Variable rate spread (percent)	3.75%
Secured Debt | New Term Loan | Minimum | Base Rate
Debt Instrument [Line Items]
Variable rate spread (percent)	3.75%
Secured Debt | New Term Loan | Maximum | LIBOR Rate
Debt Instrument [Line Items]
Variable rate spread (percent)	4.00%
Secured Debt | New Term Loan | Maximum | Base Rate
Debt Instrument [Line Items]
Variable rate spread (percent)	4.00%
Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Commitment fee (percent)	0.20%
Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Commitment fee (percent)	0.30%
Revolving Credit Facility | New Revolving Credit Facility
Debt Instrument [Line Items]
Face amount of instrument	$ 100,000,000
Percentage of excess cash flow payment when leverage ratio is greater than 3.25	50.00%
Percentage of excess cash flow payment when leverage ratio is less than or equal to 3.25	25.00%
Percentage of excess cash flow payment when leverage ratio is less than or equal to 2.50	0.00%
Proceeds from lines of credit	$ 7,900,000
Revolving Credit Facility | New Revolving Credit Facility | Federal Funds Rate
Debt Instrument [Line Items]
Fixed rate spread (percent)	0.50%
Revolving Credit Facility | New Revolving Credit Facility | Eurodollar Rate
Debt Instrument [Line Items]
Fixed rate spread (percent)	1.00%
Revolving Credit Facility | New Revolving Credit Facility | Minimum | LIBOR Rate
Debt Instrument [Line Items]
Variable rate spread (percent)	1.75%
Revolving Credit Facility | New Revolving Credit Facility | Minimum | Base Rate
Debt Instrument [Line Items]
Variable rate spread (percent)	0.75%
Revolving Credit Facility | New Revolving Credit Facility | Maximum | LIBOR Rate
Debt Instrument [Line Items]
Variable rate spread (percent)	2.75%
Revolving Credit Facility | New Revolving Credit Facility | Maximum | Base Rate
Debt Instrument [Line Items]
Variable rate spread (percent)	1.75%
Revolving Credit Facility | New Credit Facilities
Debt Instrument [Line Items]
Remaining borrowing capacity							99,700,000
Outstanding standby letters of credit							$ 300,000
Revolving Credit Facility | New Existing Revolving Credit Facility
Debt Instrument [Line Items]
Repayments of debt	$ 247,900,000

Shareholders' Equity (Detail)

Shareholders' Equity (Detail) - shares	Dec. 31, 2018	Dec. 31, 2017
Equity [Abstract]
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)plan$ / sharesshares	Dec. 31, 2017USD ($)$ / sharesshares	Dec. 31, 2016USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of incentive plans | plan	2
Options, Granted (in shares) | shares	176,940
Weighted-average fair value of grants (in dollars per share) | $ / shares	$ 12.87
Outstanding at end of period, Weighted average remaining contractual term	6 years 11 months
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares) | shares	750,000
Shares reserved for future issuance (in shares) | shares	750,000
Discount from market price, offering date	15.00%
Maximum percentage of employee compensation for purchase of common stock	10.00%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options, Granted (in shares) | shares	176,940	129,400	123,500
Weighted-average fair value of grants (in dollars per share) | $ / shares	$ 12.87	$ 11.88	$ 6.53
Expiration period from date of grant	10 years
Aggregate intrinsic value of stock options exercised	$ 1.3	$ 2.5	$ 1.3
Cash received from the exercise of options	1.8	4.3	2.1
Tax benefits realized for the tax deductions from options exercised	$ 0.3	0.9	0.5
Options vested (in shares) | shares	363,225
Weighted average exercise price (in dollars per share) | $ / shares	$ 28.33
Aggregate intrinsic value	$ 2.9
Outstanding at end of period, Weighted average remaining contractual term	6 years 11 months
Share-based compensation expense	$ 0.9	0.7	0.8
Unrecognized compensation cost related to stock option	$ 2.5
Weighted average period	2 years 5 months
Total fair value of options expensed before tax benefits	$ 0.8	0.8	0.9
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vesting term	3 years
Share-based compensation expense	$ 2.1	$ 2	$ 1.8
Weighted average period	1 year 11 months
Awards, Granted (in shares) | shares	81,230	135,350	139,450
Weighted average grant date fair value (in dollars per share) | $ / shares	$ 32.36	$ 28.97	$ 15.97
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
Fair value of awards vested in period	2.7	$ 3	$ 1.3
Tax benefit realized on vesting of options	0.6	1.1	0.7
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense	$ 1.9	$ 2	$ 0.4
Weighted average period	1 year 8 months 12 days
Awards, Granted (in shares) | shares	64,700	126,000	62,500
Weighted average grant date fair value (in dollars per share) | $ / shares	$ 35.16	$ 26.31	$ 15.92
Compensation not yet recognized	$ 3.1
Fair value of awards vested in period	0.3	$ 1.2	$ 1.1
Tax benefit realized on vesting of options	$ 0.1	$ 0.5	$ 0.2
2007 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance other than stock options (in shares) | shares	337,693
2013 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares) | shares	1,690,000
Shares reserved for future issuance (in shares) | shares	490,930
Minimum | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vesting term	3 years
Maximum | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vesting term	4 years

Stock-Based Compensation - Opti

Stock-Based Compensation - Option Activity (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)$ / sharesshares
Number of Shares
Options, Outstanding Beginning Balance (in shares) | shares	306,225
Options, Granted (in shares) | shares	176,940
Options, Exercised (in shares) | shares	(84,800)
Option, Expired (in shares) | shares	(6,075)
Options, Forfeited (in shares) | shares	(29,065)
Options, Outstanding Ending Balance (in shares) | shares	363,225
Options, Exercisable at end of period (in shares) | shares	71,212
Weighted-Average Exercise Price Per Share
Options, Beginning Balance (in dollars per share) | $ / shares	$ 23.38
Options, Granted (in dollars per share) | $ / shares	33.41
Options, Exercised (in dollars per share) | $ / shares	21.48
Options, Expired, (in dollars per share) | $ / shares	19.45
Options, Forfeited (in dollars per share) | $ / shares	28.90
Options, Ending Balance (in dollars per share) | $ / shares	28.33
Options, Exercisable at end of period (in dollars per share) | $ / shares	$ 23.09
Options, Outstanding at end of period, Weighted Average Remaining Contractual Life (Years)	6 years 11 months
Options, Exercisable at end of period, Weighted Average Remaining Contractual Life (Years)	3 years 9 months
Options, Outstanding at end of period, Aggregate Intrinsic Value | $	$ 2,934
Options, Exercisable at end of period, Aggregate Intrinsic Value | $	$ 942

Stock-Based Compensation - Chan

Stock-Based Compensation - Changes in Nonvested Stock Options (Details)	12 Months Ended
	Dec. 31, 2018$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Options, Nonvested, Beginning balance (shares) | shares	219,800
Options, Nonvested, Granted (in shares) | shares	176,940
Options, Nonvested, Vested (shares) | shares	(75,662)
Options, Nonvested, Forfeited (shares) | shares	(29,065)
Options, Nonvested, Ending balance (shares) | shares	292,013
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	$ 11.07
Options, Nonvested, Weighted Average Grant Date Fair Value, Granted, (in dollars per share) | $ / shares	12.87
Options, Nonvested, Weighted Average Grant Date Fair Value, Vested, (in dollars per share) | $ / shares	10.71
Options, Nonvested, Weighted Average Grant Date Fair Value, Forfeited, (in dollars per share) | $ / shares	11.54
Options, Nonvested, Weighted Average Grant Date Fair Value, Ending balance, (in dollars per share) | $ / shares	$ 12.20

Stock-Based Compensation - Assu

Stock-Based Compensation - Assumptions Used for Estimating Fair Value of Share Based Payment Award (Detail) - Stock Options - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate (percent)	2.65%	1.75%	1.20%
Expected volatility (percent)	53.66%	50.37%	51.79%
Expected dividends	$ 0	$ 0	$ 0
Expected term (in months)	36 months	48 months	48 months

Stock-Based Compensation - Rest

Stock-Based Compensation - Restricted Stock Activity (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Weighted Average Grant Date Fair Value
Adjustment for target performance, Weighted Average Grant Date Fair Value (in dollars per share)	$ 20.72
Restricted Stock Units
Outstanding
Awards, Outstanding at beginning of period (in shares)	185,344
Granted (in shares)	81,230	135,350	139,450
Vested (in shares)	(89,513)
Forfeited (in shares)	(19,124)
Awards, Outstanding at ending of period (in shares)	157,937	185,344
Weighted Average Grant Date Fair Value
Outstanding at beginning of period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 25.14
Granted, Weighted Average Grant Date Fair Value (in dollars per share)	32.36	$ 28.97	$ 15.97
Vested, Weighted Average Grant Date Fair Value (in dollars per share)	24.57
Forfeited, Weighted Average Grant Date Fair Value (in dollars per share)	26.85
Outstanding at ending of period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 28.96	$ 25.14
Performance Stock Units
Outstanding
Awards, Outstanding at beginning of period (in shares)	221,500
Granted (in shares)	64,700	126,000	62,500
Adjustment for target performance (in shares)	3,000
Vested (in shares)	(9,146)
Forfeited (in shares)	(43,354)
Awards, Outstanding at ending of period (in shares)	236,700	221,500
Weighted Average Grant Date Fair Value
Outstanding at beginning of period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 23.52
Granted, Weighted Average Grant Date Fair Value (in dollars per share)	35.16	$ 26.31	$ 15.92
Vested, Weighted Average Grant Date Fair Value (in dollars per share)	25.04
Forfeited, Weighted Average Grant Date Fair Value (in dollars per share)	26.29
Outstanding at ending of period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 26.21	$ 23.52

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018USD ($)CompensationPlan	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Defined Benefit Plan Disclosure [Line Items]
Number of unfunded supplemental retirement plans | CompensationPlan	3
Accumulated benefit obligations	$ 0.6	$ 0.6
Number of company sponsored 401(K) defined contribution plans | CompensationPlan	1
Provision for matching and profit sharing contribution	$ 2.6	2.7	$ 2.7
Estimated net actuarial loss for the defined benefit pension plan	0.9
Excess of accumulated benefit obligation over fair value of plan assets	10.2
Pension liability	7.2	5.6
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	$ 0.7	0.1
Interest on LaBarge Deferred Compensation Plan	$ 0.1	$ 0.7
Executives and Directors
Defined Benefit Plan Disclosure [Line Items]
Number of unfunded supplemental retirement plans | CompensationPlan	2

Employee Benefit Plans - Compon

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, 2018	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Service cost	$ 601	$ 531	$ 531
Interest cost	1,268	1,329	1,367
Expected return on plan assets	(1,784)	(1,530)	(1,482)
Amortization of actuarial losses	743	810	762
Net periodic pension cost	$ 828	$ 1,140	$ 1,178

Employee Benefit Plans - Reclas

Employee Benefit Plans - Reclassifications from Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Amortization of actuarial loss - total before tax	$ 743
Tax benefit	(173)	$ (302)	$ (283)
Net of tax	$ 570	$ 508	$ 479

Employee Benefit Plans - Obliga

Employee Benefit Plans - Obligation and Funded Status of Defined Benefit Pension Plan and Retirement Plan (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Change in benefit obligation
Benefit obligation at beginning of year	$ 36,002	$ 33,154
Service cost	601	531	$ 531
Interest cost	1,268	1,329	1,367
Actuarial (gain) loss	(2,415)	2,449
Benefits paid	(1,505)	(1,461)
Ending benefit obligation	33,951	36,002	33,154
Change in plan assets
Fair value of plan assets at beginning of year	25,646	22,015
Return on assets	(1,951)	3,481
Employer contribution	1,559	1,611
Benefits paid	(1,505)	(1,461)
Fair value of plan assets at end of year	23,749	25,646	22,015
Funded status (underfunded)	(10,202)	(10,356)
Amounts recognized in the consolidated balance sheet
Current liabilities	580	560
Non-current liabilities	9,622	9,796
Unrecognized loss included in accumulated other comprehensive loss
Unrecognized loss before tax, beginning balance	8,908	9,220
Amortization	(743)	(810)
Liability (gain) loss	(2,415)	2,449
Asset loss (gain)	3,735	(1,951)
Unrecognized loss before tax, ending balance	9,485	8,908	$ 9,220
Tax impact	(2,263)	(3,309)
Unrecognized loss included in accumulated other comprehensive loss, net of tax	$ 7,222	$ 5,599

Employee Benefit Plans - Pensio

Employee Benefit Plans - Pension Plan Asset Allocations (Detail)	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	100.00%	100.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	57.00%	70.00%
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	1.00%	1.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Plan Assets	42.00%	29.00%

Employee Benefit Plans - Asset

Employee Benefit Plans - Asset Allocation Ranges (Detail)	Dec. 31, 2018
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

Employee Benefit Plans - Return on Current and Target Asset Allocation (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	$ 23,749	$ 25,646
Total fair value of plan assets, not including pooled funds	6,126	6,164
Pooled funds	17,623	19,482
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	153	135
Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	3,647	3,494
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	1,475	1,625
Other Investments
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	851	910
Level 1
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets, not including pooled funds	6,126	6,164
Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	153	135
Level 1 | Fixed income securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	3,647	3,494
Level 1 | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	1,475	1,625
Level 1 | Other Investments
Defined Benefit Plan Disclosure [Line Items]
Pension plan assets	851	910
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 - Weight

Employee Benefit Plans - Weighted-average Assumptions Used to Determine Benefit Obligations (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Pension Plan
Discount rate used to determine pension expense :
Discount rate	3.64%	4.18%	4.55%
Discount rate used to determine value of obligations
Discount rate	4.23%	3.64%	4.18%
Long term rate of return	7.00%	7.00%	7.50%
Retirement Plan | La Barge
Discount rate used to determine pension expense :
Discount rate	3.40%	3.75%	4.00%
Discount rate used to determine value of obligations
Discount rate	4.00%	3.40%	3.75%

Employee Benefit Plans - Future

Employee Benefit Plans - Future Benefit Payments Under Pension Plans (Detail) $ in Thousands	Dec. 31, 2018USD ($)
Pension Plan
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2,019	$ 1,206
2,020	1,282
2,021	1,378
2,022	1,479
2,023	1,522
2024 - 2028	8,741
Retirement Plan | La Barge
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2,019	581
2,020	561
2,021	538
2,022	512
2,023	483
2024 - 2028	$ 1,991

Leases - Additional Information

Leases - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Leases [Abstract]
Lease term, Minimum	1 year
Lease term, Maximum	10 years
Lease rental expense	$ 5.3	$ 5	$ 4.9

Leases - Rental Payments Under

Leases - Rental Payments Under Operating Lease (Detail) $ in Thousands	Dec. 31, 2018USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2,019	$ 3,680
2,020	3,405
2,021	2,789
2,022	1,404
2,023	980
Thereafter	580
Total	$ 12,838

Income Taxes - Schedule of Comp

Income Taxes - Schedule of Components of Provision (Benefit) for Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current tax expense
Federal									$ 474	$ 2,387	$ 5,953
State									1,260	525	2,982
Current Income Tax Expense (Benefit), Total									1,734	2,912	8,935
Deferred tax (benefit) expense
Federal									(789)	(15,515)	3,876
State									291	135	41
Deferred Income Tax (Benefit) Expense, Total									(498)	(15,380)	3,917
Income tax expense (benefit)	$ 1,118	$ 119	$ 242	$ (243)	$ (14,541)	$ 940	$ 741	$ 392	$ 1,236	$ (12,468)	$ 12,852

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Tax Credit Carryforward [Line Items]
Tax Cuts and Jobs Act of 2017, tax benefit		$ 13,000
Excess tax benefit over compensation cost recognized, amount	$ 200	600
Excess tax (benefits) or shortfall from share-based compensation			$ (80)
Operating loss carryforward not expected to be realized under ASC subtopic 740-10	1,900
Tax credit carryforwards	288	5,613
Tax credit carryforwards valuation allowance	9,083	9,013
Unrecognized tax benefits	5,283	$ 5,271	$ 3,036	$ 2,963
Unrecognized tax benefits that would impact effective tax rate	3,600
State
Tax Credit Carryforward [Line Items]
Net operating loss carryforwards	2,000
Tax credit carryforwards	13,000
Tax credit carryforwards valuation allowance	11,500
Federal
Tax Credit Carryforward [Line Items]
Tax credit carryforwards	$ 2,600

Income Taxes - Schedule of Defe

Income Taxes - Schedule of Deferred Income Taxes (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Accrued expenses	$ 704	$ 313
Allowance for doubtful accounts	267	208
Contract overrun reserves	1,263	294
Deferred compensation	302	177
Employment-related accruals	4,252	2,091
Environmental reserves	479	501
Federal tax credit carryforwards	288	5,613
Inventory reserves	1,757	1,315
Pension obligation	2,324	2,398
State net operating loss carryforwards	51	86
State tax credit carryforwards	9,075	9,051
Stock-based compensation	1,661	1,480
Workers’ compensation	51	75
Other	1,538	1,492
Total gross deferred tax assets	24,012	25,094
Valuation allowance	(9,083)	(9,013)
Total gross deferred tax assets, net of valuation allowance	14,929	16,081
Deferred tax liabilities:
Deferred revenue	(649)	0
Depreciation	(7,951)	(7,976)
Goodwill	(3,963)	(2,902)
Intangibles	(19,905)	(20,611)
Prepaid insurance	(223)	(312)
Total gross deferred tax liabilities	(32,691)	(31,801)
Net deferred tax liabilities	$ (17,762)	$ (15,720)

Income Taxes - Variation Betwee

Income Taxes - Variation Between Expected and Effective Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	21.00%	35.00%	35.00%
State income taxes (net of federal benefit)	5.30%	2.50%	5.70%
Qualified domestic production activities	(0.00%)	(2.60%)	(2.00%)
Stock-based compensation expense	(1.90%)	(8.20%)	(0.00%)
Research and development tax credits	(32.00%)	(50.60%)	(8.60%)
Other tax credits	(1.20%)	(7.50%)	(0.00%)
Changes in valuation allowance	0.70%	10.60%	0.90%
Non-deductible book expenses	8.20%	1.10%	0.20%
Changes in deferred tax assets	12.10%	15.40%	1.50%
Re-measurement of deferred taxes for 2017 Tax Act	0.00%	(171.30%)	0.00%
Changes in tax reserves	1.20%	11.40%	0.00%
Other	(1.40%)	0.40%	1.00%
Effective income tax (benefit) rate	12.00%	(163.80%)	33.70%

Income Taxes - Schedule of Chan

Income Taxes - Schedule of Changes in Unrecognized Tax Benefit (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	$ 5,271	$ 3,036	$ 2,963
Additions for tax positions related to the current year	419	422	476
Additions for tax positions related to prior years	92	1,953	385
Reductions for tax positions related to prior years	(499)	(99)	(567)
Reductions for lapse of statute of limitations	0	(41)	(221)
Ending Balance	$ 5,283	$ 5,271	$ 3,036

Contingencies (Detail)

Contingencies (Detail) - Ducommun AeroStructures $ in Millions	Dec. 31, 2018USD ($)
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 Concentra_3

Major Customers and Concentrations of Credit Risk - Sales to Major Customers (Detail) - Customer Concentration Risk - Sales Revenue, Net	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Boeing
Revenue, Major Customer [Line Items]
Concentration percentage	17.00%	16.30%	17.30%
Lockheed Martin
Revenue, Major Customer [Line Items]
Concentration percentage	4.40%	5.50%	5.60%
Raytheon
Revenue, Major Customer [Line Items]
Concentration percentage	11.70%	13.50%	8.40%
Spirit
Revenue, Major Customer [Line Items]
Concentration percentage	9.50%	8.20%	8.20%
United Technologies
Revenue, Major Customer [Line Items]
Concentration percentage	4.60%	4.70%	5.30%
Top Ten Customers
Revenue, Major Customer [Line Items]
Concentration percentage	62.90%	62.50%	58.70%

Major Customers and Concentra_4

Major Customers and Concentrations of Credit Risk - Receivables from Customers (Detail) - Customer Concentration Risk - Accounts Receivable	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Boeing
Concentration Risk [Line Items]
Concentration percentage	8.00%	7.80%
Lockheed Martin
Concentration Risk [Line Items]
Concentration percentage	2.50%	5.90%
Raytheon
Concentration Risk [Line Items]
Concentration percentage	3.20%	1.40%
Spirit
Concentration Risk [Line Items]
Concentration percentage	0.00%	13.50%
United Technologies
Concentration Risk [Line Items]
Concentration percentage	2.50%	2.30%

Major Customers and Concentra_5

Major Customers and Concentrations of Credit Risk - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Concentration Risk [Line Items]
Revenues	$ 164,183	$ 159,842	$ 154,827	$ 150,455	$ 142,258	$ 138,690	$ 140,938	$ 136,297	$ 629,307	$ 558,183	$ 550,642
Foreign Customers Worldwide
Concentration Risk [Line Items]
Revenues									$ 71,900	$ 57,200	$ 56,400
Maximum | Foreign Customers Worldwide
Concentration Risk [Line Items]
Percentage of sales									3.00%	3.00%	3.00%

Business Segment Information -

Business Segment Information - Additional Information (Detail) $ in Thousands	Apr. 23, 2018USD ($)	Sep. 11, 2017USD ($)	Sep. 30, 2017USD ($)	Dec. 31, 2018USD ($)Segment	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Jun. 30, 2018
Segment Reporting [Abstract]
Number of reportable segments | Segment				2
Segment Reporting Information [Line Items]
Purchase price, net of cash acquired				$ 0	$ 59,798	$ 0
Certified Thermoplastics Co., LLC
Segment Reporting Information [Line Items]
Equity interest acquired	100.00%						100.00%
Purchase price, net of cash acquired	$ 30,700
Gross purchase price	$ 30,810
Lightning Diversion Systems, Inc.
Segment Reporting Information [Line Items]
Equity interest acquired		100.00%	100.00%
Purchase price, net of cash acquired		$ 60,000	$ 60,000
Gross purchase price		$ 62,000	$ 62,000

Business Segment Information _2

Business Segment Information - Financial Information by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Net Revenues	$ 164,183	$ 159,842	$ 154,827	$ 150,455	$ 142,258	$ 138,690	$ 140,938	$ 136,297	$ 629,307	$ 558,183	$ 550,642
Segment Operating Income (Loss)									49,979	37,026	46,128
Corporate General and Administrative Expenses									(26,061)	(21,392)	(16,912)
Operating Income									23,918	15,634	29,216
Depreciation and amortization									25,296	22,845	22,860
Capital Expenditures									16,337	26,473	18,693
Electronic Systems
Segment Reporting Information [Line Items]
Net Revenues									337,868	316,723
Structural Systems
Segment Reporting Information [Line Items]
Net Revenues									291,439	241,460
Operating Segments | Electronic Systems
Segment Reporting Information [Line Items]
Net Revenues									337,868	316,723	304,177
Segment Operating Income (Loss)									30,916	31,236	29,284
Depreciation and amortization									14,223	13,888	14,087
Capital Expenditures									6,719	5,019	3,032
Operating Segments | Structural Systems
Segment Reporting Information [Line Items]
Net Revenues									291,439	241,460	246,465
Segment Operating Income (Loss)									19,063	5,790	16,844
Depreciation and amortization									10,525	8,860	8,688
Capital Expenditures									9,104	20,679	15,661
Corporate Administration
Segment Reporting Information [Line Items]
Depreciation and amortization									548	97	85
Capital Expenditures									$ 514	$ 775	$ 0

Business Segment Information _3

Business Segment Information - Segment Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Total Assets	$ 648,143	$ 566,753
Goodwill and Intangibles	248,149	232,128
Operating Segments | Electronic Systems
Segment Reporting Information [Line Items]
Total Assets	405,743	362,831
Goodwill and Intangibles	219,872	229,292
Operating Segments | Structural Systems
Segment Reporting Information [Line Items]
Total Assets	226,304	193,600
Goodwill and Intangibles	28,277	2,836
Corporate Administration
Segment Reporting Information [Line Items]
Total Assets	$ 16,096	$ 10,322

Supplemental Quarterly Financ_3

Supplemental Quarterly Financial Data (Unaudited) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Net Revenues	$ 164,183	$ 159,842	$ 154,827	$ 150,455	$ 142,258	$ 138,690	$ 140,938	$ 136,297	$ 629,307	$ 558,183	$ 550,642
Gross Profit	32,697	31,116	32,028	26,755	25,772	26,087	26,269	25,005	122,596	103,133	106,540
Income (Loss) Before Taxes	1,791	4,290	1,833	2,357	(5,057)	5,595	4,564	2,507	10,271	7,609	38,113
Income Tax Expense (Benefit)	1,118	119	242	(243)	(14,541)	940	741	392	1,236	(12,468)	12,852
Net Income	$ 673	$ 4,171	$ 1,591	$ 2,600	$ 9,484	$ 4,655	$ 3,823	$ 2,115	$ 9,035	$ 20,077	$ 25,261
Earnings Per Share
Basic earnings (loss) per share (in dollars per share)	$ 0.06	$ 0.37	$ 0.14	$ 0.23	$ 0.84	$ 0.41	$ 0.34	$ 0.19	$ 0.79	$ 1.78	$ 2.27
Diluted earnings (loss) per share (in dollars per share)	$ 0.06	$ 0.36	$ 0.14	$ 0.22	$ 0.82	$ 0.41	$ 0.33	$ 0.18	$ 0.77	$ 1.74	$ 2.24

Supplemental Quarterly Financ_4

Supplemental Quarterly Financial Data (Unaudited) - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended					12 Months Ended
	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Apr. 23, 2018	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	$ 3,800	$ 3,400	$ 5,400	$ 2,200	8,800	$ 14,671	$ 8,360	$ 182
Certified Thermoplastics Co., LLC
Segment Reporting Information [Line Items]
Equity interest acquired			100.00%						100.00%
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 Accoun

Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 868	$ 495	$ 359
Additions Charged to Costs and Expenses	776	334	233
Deductions/(Recoveries)	509	(39)	97
Balance at End of Period	1,135	868	495
Valuation Allowance of Deferred Tax Assets
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	9,013	6,607	7,477
Additions Charged to Costs and Expenses	70	2,406	(870)
Deductions/(Recoveries)	0	0	0
Balance at End of Period	$ 9,083	$ 9,013	$ 6,607

Uncategorized Items - dco-20181

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