Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities:
Net income	$ 24,537	$ 77,922
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	59,071	65,492
Amortization of financing costs and discounts	613	7,296
Non-cash operating lease costs	2,392	3,320
Share-based compensation	6,717	6,113
Provision for credit losses on accounts receivable	(1,032)	2,485
Deferred income taxes, net	(3,745)	(5,380)
Loss on extinguishment of debt	1,220	0
Gain on sale of businesses	0	(1,979)
Lease asset impairments and other charges	0	1,086
Changes in fair value of contingent consideration	112	510
Foreign currency remeasurement gain	143	655
Loss (income) from equity method investments	785	(24,270)
Unrealized gain on short-term investments	(8,951)	0
Decrease (increase) in:
Accounts receivable (includes $5,278 and $0 with related parties)	57,483	68,564
Prepaid expenses and other current assets	10,638	(2,481)
Operating lease right-of-use assets	1,938	1,438
Other assets	(7,541)	1,193
Increase (decrease) in:
Accounts payable and accrued expenses	(25,694)	(22,078)
Income taxes payable	3,193	2,471
Deferred revenue	3,061	7,867
Operating lease liabilities	(6,924)	(7,389)
Liability for uncertain tax positions	403	1,304
Other long-term liabilities	(1,908)	(5,415)
Net cash provided by operating activities	116,511	178,724
Cash flows from investing activities:
Purchases of equity method investment	0	(8,064)
Purchases of equity investments	0	(999)
Purchases of property and equipment	(30,502)	(26,269)
Proceeds from sale of assets	0	5,999
Acquisition of businesses, net of cash received	(28,136)	385
Purchases of intangible assets	0	(8)
Net cash used in investing activities	(58,638)	(28,956)
Cash flows from financing activities:
Payment of debt	(54,609)	0
Debt extinguishment costs	(756)	0
Repurchase of common stock	(62,810)	(12,179)
Exercise of stock options	148	444
Deferred payments for acquisitions	(2,676)	(7,853)
Other	(5)	(551)
Net cash used in financing activities	(120,708)	(20,139)
Effect of exchange rate changes on cash and cash equivalents	(2,977)	(310)
Net change in cash and cash equivalents	(65,812)	129,319
Cash and cash equivalents at beginning of period	694,842	242,652
Cash and cash equivalents at beginning of period associated with discontinued operations	0	66,210
Cash and cash equivalents at beginning of period associated with continuing operations	694,842	176,442
Cash and cash equivalents at end of period	629,030	371,971
Cash and cash equivalents at end of period associated with discontinued operations	0	149,675
Cash and cash equivalents at end of period associated with continuing operations	$ 629,030	$ 222,296