Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Flows from Operating Activities
Net (Loss) Income	$ (73,282)	$ 19,867	$ 11,378
Adjustments to Reconcile Net Income (Loss) to Net Cash Provided by Operating Activities
Depreciation and amortization	26,846	29,024	30,926
Goodwill impairment	57,243	0	0
Intangible asset impairment	32,937	0	0
Asset impairments	0	0	6,975
Stock-based compensation expense	3,495	3,725	2,438
Deferred income taxes	(30,707)	345	(1,551)
Excess tax benefits from stock-based compensation	(626)	(140)	0
Provision for (recovery of) doubtful accounts	(132)	237	77
Noncash loss on extinguishment of debt	4,970	0	0
Other	5,628	(5,713)	5,337
Changes in Assets and Liabilities:
Accounts receivable	4,444	1,086	5,468
Inventories	20,985	(2,335)	6,962
Production cost of contracts	330	(3,513)	(5,101)
Other assets	5,884	4,800	(12,173)
Accounts payable	(13,978)	410	4,533
Accrued and other liabilities	(20,623)	6,103	(9,153)
Net Cash Provided by Operating Activities	23,678	53,422	45,962
Cash Flows from Investing Activities
Purchases of property and equipment	(15,891)	(18,096)	(12,403)
Proceeds from sale of assets	904	91	139
Insurance recoveries related to property and equipment	1,510	2,550	0
Net Cash Used in Investing Activities	(13,477)	(15,455)	(12,264)
Cash Flows from Financing Activities
Borrowings from senior secured revolving credit facility	65,000	0	0
Repayment of senior secured revolving credit facility	(65,000)	(42,650)	(33,024)
Borrowings from term loan	275,000	0	0
Repayments of senior unsecured notes and term loans	(320,000)	0	0
Repayments of other debt	(26)	0	0
Debt issuance costs	(4,848)	0	(365)
Excess tax benefits from stock-based compensation	626	140	0
Net proceeds from issuance of common stock under stock plans	(1,126)	1,356	1,968
Net Cash Used in Financing Activities	(50,374)	(41,154)	(31,421)
Net (Decrease) Increase in Cash and Cash Equivalents	(40,173)	(3,187)	2,277
Cash and Cash Equivalents at Beginning of Year	45,627	48,814	46,537
Cash and Cash Equivalents at End of Year	5,454	45,627	48,814
Supplemental Disclosures of Cash Flow Information
Interest paid	26,501	25,105	27,614
Taxes paid	1,150	3,476	7,835
Non-cash activities:
Purchases of property and equipment not yet paid	$ 1,549	$ 1,458	$ 1,000