Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating activities
Net income (loss)	$ 13,826	$ (50,061)	$ (31,578)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation of property and equipment	9,484	12,875	14,459
Amortization of intangible assets	34,154	33,205	33,817
Amortization of debt issuance cost	6,690	8,092	8,382
Loss on extinguishment of debt	16,528	0	0
Stock-based compensation	12,943	0	0
Net undistributed (loss) income from unconsolidated ventures	(6,504)	(2,680)	180
Deferred income taxes, net	(19,278)	(17,247)	(14,801)
Other non-cash activities, net	383	36,942	380
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable, net	(54,345)	74,416	(101,178)
Accounts payable	(4,529)	618	35,404
Accrued expenses	9,529	(5,629)	12,058
Customer advances and billings in excess of costs	48,618	23,569	(15,004)
Salaries, benefits and payroll taxes	554	17,411	7,510
Prepaid expenses and other current assets	(5,862)	3,202	355
Other current and noncurrent liabilities	39,215	(25,220)	(8,628)
Investments	6,538	6,102	12,973
Other noncurrent assets	(4,141)	1,450	(688)
Accrued taxes	(2,941)	(397)	(10,482)
Net cash provided by (used in) operating activities	100,862	116,648	(56,841)
Investing activities
Expenditures for property and equipment	(3,835)	(9,436)	(5,702)
Acquisition of Metis Solutions Corporation, net of acquired cash	(90,271)	0	0
Acquisition of Centra Technology Inc, net of acquired cash	(222,124)	0	0
Other investing activities, net	17	6,747	(10,849)
Net cash used in investing activities	(316,213)	(2,689)	(16,551)
Financing activities
Net contributions from noncontrolling interests	2,095	5,405	0
Borrowings on long-term debt	961,030	267,375	107,099
Repayments on short-term debt	0	0	(1,966)
Repayments on long-term debt	(843,131)	(367,312)	(69,480)
Payment of debt issuance costs	(26,646)	0	0
Recapitalization from merger with Gores III	605,713	0	0
Payment of underwriting and transaction costs	(27,267)	0	0
Distribution to selling stockholders	(439,719)	0	0
Other financing activities, net	(292)	(742)	(2,806)
Net cash provided by (used in) financing activities	231,783	(95,274)	32,847
Effect of exchange rate changes on cash and cash equivalents	1,441	(1,747)	(1,940)
Net increase (decrease) in cash and cash equivalents	17,873	16,938	(42,485)
Cash and cash equivalents at beginning of period	68,035	51,097	93,582
Cash and cash equivalents at end of period	85,908	68,035	51,097
Supplemental cash flow information
Cash paid for interest	45,247	78,019	74,579
Cash paid for taxes	$ 10,936	$ 9,552	$ 19,093