Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows from Operating Activities
Net Income (Loss)	$ 25,261	$ (74,879)	$ 19,867
Adjustments to Reconcile Net Income (Loss) to Net Cash Provided by Operating Activities
Depreciation and amortization	22,860	26,846	29,024
Gain on divestitures, net	(17,604)	0	0
Goodwill impairment	0	57,243	0
Intangible asset impairment	0	32,937	0
Stock-based compensation expense	3,007	3,495	3,725
Deferred income taxes	3,519	(29,110)	345
Excess tax benefits from stock-based compensation	(248)	(626)	(140)
Provision for (recovery of) doubtful accounts	112	132	(237)
Noncash loss on extinguishment of debt	0	4,970	0
Other	(7,204)	5,628	(5,713)
Changes in Assets and Liabilities:
Accounts receivable	3,220	4,444	1,086
Inventories	(5,182)	20,985	(2,335)
Production cost of contracts	(1,536)	330	(3,513)
Other assets	2,974	5,884	4,800
Accounts payable	15,055	(13,978)	410
Accrued and other liabilities	(966)	(20,623)	6,103
Net Cash Provided by Operating Activities	43,268	23,678	53,422
Cash Flows from Investing Activities
Purchases of property and equipment	(17,001)	(15,891)	(18,096)
Proceeds from sale of assets	16	904	91
Insurance recoveries related to property and equipment	0	1,510	2,550
Proceeds from divestitures	51,893	0	0
Net Cash Provided by (Used in) Investing Activities	34,908	(13,477)	(15,455)
Cash Flows from Financing Activities
Borrowings from senior secured revolving credit facility	71,800	65,000	0
Repayment of senior secured revolving credit facility	(71,800)	(65,000)	(42,650)
Borrowings from term loan	0	275,000	0
Repayments of senior unsecured notes and term loans	(75,000)	(320,000)	0
Repayments of other debt	(23)	(26)	0
Debt issuance costs	0	(4,848)	0
Excess tax benefits from stock-based compensation	248	626	140
Net (cash paid) proceeds from issuance of common stock under stock plans	(1,423)	(1,126)	1,356
Net Cash Used in Financing Activities	(76,198)	(50,374)	(41,154)
Net Increase (Decrease) in Cash and Cash Equivalents	1,978	(40,173)	(3,187)
Cash and Cash Equivalents at Beginning of Year	5,454	45,627	48,814
Cash and Cash Equivalents at End of Year	7,432	5,454	45,627
Supplemental Disclosures of Cash Flow Information
Interest paid	6,877	26,501	25,105
Taxes paid	9,778	1,150	3,476
Non-cash activities:
Purchases of property and equipment not yet paid	$ 3,241	$ 1,549	$ 1,458