Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2021	Jun. 28, 2020
Operating activities
Net income	$ 27,182	$ 23,469
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of property and equipment	4,747	5,072
Amortization of intangible assets	24,846	16,094
Amortization of debt issuance cost	1,572	7,821
Stock-based compensation	4,625	3,700
Net undistributed income from unconsolidated ventures	(6,568)	(1,739)
Deferred income taxes, net	6,557	(14,110)
Change in fair value of warrant liability	(1,133)	(14,132)
Other non-cash activities, net	(810)	404
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable, net	(20,000)	9,607
Accounts payable	21,838	(17,547)
Accrued expenses	5,002	9,845
Customer advances and billings in excess of costs	(17,571)	19,282
Salaries, benefits and payroll taxes	1,000	4,310
Prepaid expenses and other current assets	(2,910)	(841)
Other current and noncurrent liabilities	528	(5,101)
Investments	4,758	1,701
Other noncurrent assets	(6,237)	11,600
Accrued taxes	(3,889)	(3,847)
Net cash provided by operating activities	43,537	55,588
Investing activities
Expenditures for property and equipment	(14,400)	(1,597)
Proceeds from sales of property	231	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	(373)	37
Net cash used in investing activities	(30,812)	(1,560)
Financing activities
Net contributions from noncontrolling interests	490	1,950
Borrowings on long-term debt	125,383	60,468
Repayments on long-term debt	(122,584)	(204,464)
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	(419,548)
Stock-based compensation tax withholding obligation	(5,659)	0
Other financing activities, net	(825)	(292)
Net cash (used in) provided by financing activities	(3,195)	15,596
Effect of exchange rate changes on cash and cash equivalents	(728)	810
Net increase in cash and cash equivalents	8,802	70,434
Cash and cash equivalents at beginning of period	85,908	68,035
Cash and cash equivalents at end of period	94,710	138,469
Supplemental cash flow information
Cash paid for interest	27,846	23,278
Cash paid for taxes	$ 7,273	$ 2,796