CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
CASH FLOWS FROM OPERATING ACTIVITIES
Net loss	$ (146,726)	$ (78,106)
Net (loss) income from discontinued operations, net of tax	53,743	443
Net loss from continuing operations	(200,469)	(78,549)
Adjustments to reconcile net loss to net cash provided by operating activities
Noncash interest income (expense)	1,664	(12,699)
Deferred financing fees related to repricing of long-term debt	1,079	0
Amortization of deferred financing fees	5,137	6,387
Impairment of goodwill and indefinite-lived assets	99,670	0
Depreciation and amortization	152,931	157,436
Change in fair value of warrant liability	(359)	587
Fair value adjustments related to contingent consideration	1,678	10,487
Deferred income taxes	(16,241)	(56,986)
Equity-based compensation of Karman Topco L.P.	(658)	(3,278)
Stock-based compensation	24,224	29,401
Loss from equity method investments	(2,692)
Distribution received from equity method investments	3,289	1,611
Gain on repurchases of Senior Secured Notes and Term Loan Facility debt	(9,141)	(5,241)
Loss on disposal of property and equipment	775	782
Changes in operating assets and liabilities, net of effects from divestitures:
Accounts receivable, net	(9,550)	19,816
Prepaid expenses and other assets	30,567	87,368
Accounts payable	25,435	(1,883)
Accrued compensation and benefits	(43,849)	(13,511)
Deferred revenues	2,992	14,686
Other accrued expenses and other liabilities	11,527	20,294
Net cash provided by operating activities from continuing operations	78,009	172,576
Net cash provided by operating activities from discontinued operations	6,437	8,227
Net cash provided by operating activities	84,446	180,803
CASH FLOWS FROM INVESTING ACTIVITIES
Purchase of investments in unconsolidated affiliates	(13,932)	(3,023)
Purchase of property and equipment	(50,358)	(24,424)
Proceeds from divestitures, net of cash	275,717	12,763
Proceeds from sale of investments in unconsolidated affiliates	0	4,428
Net cash provided by (used in) investing activities from continuing operations	211,427	(10,256)
Net cash used in investing activities from discontinued operations	(7,304)	(5,234)
Net cash provided by (used in) investing activities	204,123	(15,490)
CASH FLOWS FROM FINANCING ACTIVITIES
Borrowings under lines of credit	0	77,884
Payments on lines of credit	0	(77,222)
Principal payments on long-term debt	(9,938)	(10,172)
Repurchases of Senior Secured Notes and Term Loan Facility debt	(147,122)	(103,954)
Debt issuance costs	(971)	0
Proceeds from issuance of common stock	2,294	2,248
Payments for taxes related to net share settlement under 2020 Incentive Award Plan	(11,663)	(1,277)
Contingent consideration payments	(5,655)	(1,867)
Holdback payments	0	(656)
Redemption of noncontrolling interest	0	(154)
Purchase of treasury stock	(34,067)	0
Net cash used in financing activities from continuing operations	(207,122)	(115,170)
Net cash (used in) provided by financing activities from discontinued operations	(4,362)	397
Net cash used in financing activities	(211,484)	(114,773)
Net effect of foreign currency changes on cash from continuing operations	(1,405)	655
Net effect of foreign currency changes on cash from discontinued operations	(412)	(2,017)
Net effect of foreign currency changes on cash	(1,817)	(1,362)
Net change in cash, cash equivalents and restricted cash	75,268	49,178
Cash, cash equivalents and restricted cash, beginning of period	137,202	138,532
Cash, cash equivalents and restricted cash, end of period	212,470	187,710
Less: Cash, cash equivalents and restricted cash of discontinued operations	0	4,024
Cash, cash equivalents and restricted cash, end of period	212,470	183,686
SUPPLEMENTAL CASH FLOW INFORMATION
Gain on divestitures from discontinued operations	95,260	0
Noncash consideration for purchases of investments in unconsolidated affiliates	2,000	0
Noncash proceeds from divestitures	45,056	0
Purchase of property and equipment recorded in accounts payable and accrued expenses	$ 4,650	$ 437