Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 26, 2021	Sep. 27, 2020
Operating activities
Net income	$ 55,013	$ 39,199
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment	7,768	7,263
Amortization of intangible assets	37,476	24,141
Amortization of debt issuance cost	2,387	9,560
Stock-based compensation	6,347	8,018
Net undistributed income from unconsolidated ventures	(8,625)	(3,533)
Deferred income taxes, net	7,249	(12,044)
Change in fair value of warrant liability	(17,533)	(19,132)
Other non-cash activities, net	(2,714)	382
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable, net	61,375	(3,477)
Accounts payable	(28,195)	15,852
Accrued expenses	(7,105)	4,252
Customer advances and billings in excess of costs	(256)	8,923
Salaries, benefits and payroll taxes	7,488	10,975
Prepaid expenses and other current assets	(2,124)	(2,118)
Other current and noncurrent liabilities	(19,620)	71
Investments	9,907	2,793
Other noncurrent assets	(5,576)	5,903
Accrued taxes	(3,458)	(4,904)
Net cash provided by operating activities	99,804	92,124
Investing activities
Expenditures for property and equipment	(19,577)	(2,628)
Proceeds from sales of property	5,195	0
Acquisition of CENTRA Technology, Inc., net of acquired cash	(1,441)	0
Acquisition of Metis Solutions Corporation, net of acquired cash	(521)	0
Acquisition of noncontrolling interest	(14,308)	0
Other investing activities, net	2,030	(72)
Net cash used in investing activities	(28,622)	(2,700)
Financing activities
Net contributions from noncontrolling interests	2,927	2,095
Borrowings on long-term debt	237,010	60,734
Repayments on long-term debt	(233,409)	(212,184)
Payment of debt issuance costs	0	(964)
Recapitalization from merger with Gores Holdings III, Inc.	0	605,713
Payment of underwriting and transaction costs	0	(27,267)
Distribution to selling stockholders	0	(439,719)
Stock-based compensation tax withholding obligation	(5,818)	0
Other financing activities, net	0	(292)
Net cash provided by (used in) financing activities	710	(11,884)
Effect of exchange rate changes on cash and cash equivalents	(532)	(129)
Net increase in cash and cash equivalents	71,360	77,411
Cash and cash equivalents at beginning of period	85,908	68,035
Cash and cash equivalents at end of period	157,268	145,446
Supplemental cash flow information
Cash paid for interest	40,048	35,085
Cash paid for taxes	$ 9,343	$ 5,304