Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 04, 2020	Mar. 30, 2019
Cash flows from operating activities:
Net income	$ 15,600	$ 8,257
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	5,186	4,497
Amortization	4,742	4,015
Provision for allowance for doubtful accounts	646	68
Stock-based compensation	1,530	1,198
Amortization and write-offs of deferred financing costs and debt discount	311	427
Gains on sales of assets	(82)	(28)
Change in operating assets and liabilities (net of effects of acquisition):
Accounts receivable	(17,857)	(60)
Inventories	(4,039)	(3,651)
Contract assets, net, prepaid expenses, other current and other assets	(1,029)	(4,678)
Accounts payable, accrued and other liabilities	5,916	(9,137)
Net cash provided by operating activities	10,924	908
Cash flows from investing activities:
Purchases of property, plant and equipment	(2,327)	(8,299)
Business acquisition	(90,145)
Proceeds from sales of assets	82	28
Net cash used in investing activities	(92,390)	(8,271)
Cash flows from financing activities:
Proceeds from issuance of senior notes	53,188
Payments of long-term debt		(76)
Payments of financing costs	(1,266)
Purchases of treasury stock relating to tax withholdings on employee equity awards	(815)	(505)
Proceeds from exercise of stock options	549	213
Proceeds from issuance of common stock under employee stock purchase plan	119	17
Net cash provided by (used in) financing activities	51,775	(351)
Net decrease in cash and cash equivalents	(29,691)	(7,714)
Cash and cash equivalents at beginning of period	97,243	52,650
Cash and cash equivalents at end of period	67,552	44,936
Non-cash activity:
Establish right-of-use asset	14,605	31,165
Establish operating lease liability	(14,605)	(33,594)
Property, plant and equipment additions in accounts payable	$ 119	$ 729