Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 26, 2020	Sep. 28, 2019
Cash Flows from Operating Activities
Net Income	$ 19,521	$ 23,590
Net Cash Provided by Operating Activities:
Depreciation and amortization	21,741	20,751
Non-cash operating lease cost	2,325	1,972
Stock-based compensation expense	6,605	5,322
Deferred income taxes	1,715	113
Provision for (recovery of) credit losses	102	(239)
Insurance recoveries related to loss on operating assets	2,220	0
Other	579	152
Changes in Assets and Liabilities:
Accounts receivable	4,226	(8,944)
Contract assets	(34,047)	(15,810)
Inventories	(17,991)	(8,723)
Production cost of contracts	(658)	(1,537)
Other assets	133	525
Accounts payable	(16,584)	8,806
Contract liabilities	12,316	(5,295)
Operating lease liabilities	(2,188)	(2,026)
Accrued and other liabilities	1,506	1,412
Net Cash Provided by Operating Activities	1,521	20,069
Cash Flows from Investing Activities
Purchases of property and equipment	(8,235)	(14,698)
Insurance recoveries related to property and equipment	2,780	0
Post closing cash received from the acquisition of Nobles Worldwide, Inc., net	190	0
Net Cash Used in Investing Activities	(5,265)	(14,698)
Cash Flows from Financing Activities
Borrowings from senior secured revolving credit facility	65,900	163,500
Repayments of senior secured revolving credit facility	(15,900)	(163,500)
Repayments of term loans	(10,862)	(6,570)
Repayments of other debt	(203)	(118)
Net cash paid upon issuance of common stock under stock plans	(220)	(2,204)
Net Cash Provided by (Used in) Financing Activities	38,715	(8,892)
Net Increase (Decrease) in Cash and Cash Equivalents	34,971	(3,521)
Cash and Cash Equivalents at Beginning of Period	39,584	10,263
Cash and Cash Equivalents at End of Period	$ 74,555	$ 6,742