Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Apr. 01, 2017
Cash Flows from Operating Activities
Net Income	$ 2,600	$ 2,115
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Depreciation and amortization	5,981	5,782
Property and equipment impairment due to restructuring	1,077	0
Stock-based compensation expense	1,090	1,822
Deferred income taxes	(206)	532
(Recovery of) provision for doubtful accounts	(143)	26
Other	8,810	(1,860)
Changes in Assets and Liabilities:
Accounts receivable	9,292	4,590
Contract assets	(78,163)	0
Inventories	36,229	(7,305)
Production cost of contracts	(55)	45
Other assets	412	610
Accounts payable	12,213	6,465
Contract liabilities	15,723	0
Accrued and other liabilities	(4,524)	415
Net Cash Provided by Operating Activities	10,336	13,237
Cash Flows from Investing Activities
Purchases of property and equipment	(3,341)	(6,797)
Proceeds from sale of assets	41	3
Net Cash Used in Investing Activities	(3,300)	(6,794)
Cash Flows from Financing Activities
Borrowings from senior secured revolving credit facility	76,700	55,600
Repayments of senior secured revolving credit facility	(83,300)	(55,600)
Repayments of term loan	0	(5,000)
Repayments of other debt	0	(3)
Net cash paid upon issuance of common stock under stock plans	(789)	(1,758)
Net Cash Used in Financing Activities	(7,389)	(6,761)
Net Decrease in Cash and Cash Equivalents	(353)	(318)
Cash and Cash Equivalents at Beginning of Period	2,150	7,432
Cash and Cash Equivalents at End of Period	$ 1,797	$ 7,114