Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Cash Flows from Operating Activities
Net Income	$ 7,472	$ 2,600
Net Cash Provided by Operating Activities:
Depreciation and amortization	6,755	5,981
Amortization of right-of-use assets	633
Property and equipment impairment due to restructuring	0	1,077
Stock-based compensation expense	1,464	1,090
Deferred income taxes	217	(206)
Provision for (recovery of) doubtful accounts	104	(143)
Other	(19)	8,810
Changes in Assets and Liabilities:
Accounts receivable	4,581	9,292
Contract assets	(6,641)	(78,163)
Inventories	(2,869)	36,229
Production cost of contracts	105	(55)
Other assets	(450)	412
Accounts payable	(1,789)	12,213
Contract liabilities	(2,115)	15,723
Accrued and other liabilities	(9,154)	(4,524)
Net Cash (Used in) Provided by Operating Activities	(1,706)	10,336
Cash Flows from Investing Activities
Purchases of property and equipment	(3,225)	(3,341)
Proceeds from sale of assets	0	41
Net Cash Used in Investing Activities	(3,225)	(3,300)
Cash Flows from Financing Activities
Borrowings from senior secured revolving credit facility	61,900	76,700
Repayments of senior secured revolving credit facility	(58,700)	(83,300)
Repayments of term loan	(3,000)	0
Net cash paid upon issuance of common stock under stock plans	(1,805)	(789)
Net Cash Used in Financing Activities	(1,605)	(7,389)
Net Increase (Decrease) in Cash and Cash Equivalents	(6,536)	(353)
Cash and Cash Equivalents at Beginning of Period	10,263	2,150
Cash and Cash Equivalents at End of Period	$ 3,727	$ 1,797