Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018
Cash flows from operating activities:
Net income	$ 40,408	$ 43,459
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	13,854	9,724
Amortization	11,959	6,126
Amortization of operating lease right-of-use asset	3,637
Provision for allowance for doubtful accounts	1,659	1,017
Stock-based compensation, including special employee grant	3,246	2,543
Amortization and write-offs of deferred financing costs and debt discount	1,303	7,086
Debt extinguishment costs		3,375
Gains on sales of assets	(3)	(2,611)
Change in operating assets and liabilities (net of effects of acquisition):
Accounts receivable	(2,682)	(27,598)
Inventories	(2,900)	(1,723)
Contract assets, net, prepaid expenses, other current and other assets	(7,720)	(4,448)
Change in operating lease liability	1,421
Accounts payable, accrued and other liabilities	(9,910)	27,602
Net cash provided by operating activities	54,272	64,552
Cash flows from investing activities:
Purchases of property, plant and equipment	(20,252)	(21,740)
Business acquisition		(355,213)
Proceeds from sales of assets	43	5,866
Net cash used in investing activities	(20,209)	(371,087)
Cash flows from financing activities:
Proceeds from issuance of senior notes		315,000
Proceeds from issuance of common stock		152,653
Payments of long-term debt	(163)	(152,220)
Payments of financing costs		(12,066)
Purchases of treasury stock under Board of Director approved plan	(5,550)
Purchases of treasury stock relating to tax withholdings on employee equity awards	(505)	(637)
Proceeds from exercise of stock options	1,262	1,928
Proceeds from issuance of common stock under employee stock purchase plan (ESPP)	46	18
Other		(11)
Net cash provided by (used in) financing activities	(4,910)	304,665
Net increase (decrease) in cash and cash equivalents	29,153	(1,870)
Cash and cash equivalents at beginning of period	52,650	34,029
Cash and cash equivalents at end of period	$ 81,803	$ 32,159