Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities
Net income (loss)	$ 203,785	$ (618,702)	$ 937,664
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization expense	101,178	143,516	193,356
Amortization of operating lease right-of-use assets	44,078	80,203	122,673
Loss on impairment of assets	73,756	790,229	940
Gain on sales and disposal of subsidiaries, property and equipment and leases, net	(609,529)	(22,756)	(753,519)
Loss (gain) on derivative instruments	24,517	25,980	(7,438)
Payments for settlement of derivative contracts	0	(626)	(8,772)
Loss on debt extinguishment	77,999	610	28,752
Non-cash interest expense	6,761	17,450	3,535
Interest paid on deferred purchase price for acquisitions	0	(3,969)	(5,305)
Non-cash share-based compensation expense	10,172	13,298	12,994
Bad debt expense	34,370	117,867	100,829
Deferred income taxes	195,563	(185,652)	(29,813)
Unrealized foreign currency exchange (gain) loss	(7,033)	26,344	29,186
Non-cash loss from non-income tax contingencies	12,150	3,059	9,075
Payments for lease settlements	(46,804)	0	0
Other, net	1,106	408	(5,341)
Changes in operating assets and liabilities:
Receivables	(15,986)	(323,036)	(163,202)
Prepaid expenses and other assets	(17,433)	(28,504)	(42,047)
Accounts payable and accrued expenses	(45,329)	(47,200)	5,574
Income tax receivable/payable, net	(101,126)	99,563	(36,220)
Deferred revenue and other liabilities	(98,277)	171,474	(53,152)
Net cash (used in) provided by operating activities	(156,082)	259,556	339,769
Cash flows from investing activities
Purchase of property and equipment	(50,444)	(74,624)	(155,641)
Expenditures for deferred costs	(5,843)	(14,538)	(17,701)
Receipts from sales of discontinued operations, net of cash sold, property and equipment	2,150,820	676,569	1,266,042
Settlement of derivatives related to sale of discontinued operations and net investment hedge	(50,341)	0	12,866
Business acquisitions, net of cash acquired	0	0	(1,205)
Proceeds from sale of investment	0	0	11,473
Other, net	0	(7)	926
Net cash provided by investing activities	2,044,192	587,400	1,116,760
Cash flows from financing activities
Proceeds from issuance of long-term debt, net of original issue discount	46,493	528,382	1,123,179
Payments on long-term debt	(942,030)	(705,353)	(2,507,790)
Payments of deferred purchase price for acquisitions	0	(5,680)	(20,157)
Payments to purchase noncontrolling interests	0	(13,716)	(5,761)
Special cash distributions	(1,374,855)	0	0
Proceeds from exercise of stock options	3,411	25,716	14,007
Payments to repurchase common stock	(380,505)	(99,523)	(264,093)
Withholding of shares to satisfy tax withholding for vested stock awards and exercised stock options	(2,769)	(1,154)	(2,245)
Payments of call premiums and debt issuance costs	(32,980)	(779)	(9,091)
Distributions to noncontrolling interest holders	0	(609)	(2,026)
Net cash used in financing activities	(2,683,235)	(272,716)	(1,673,977)
Effects of exchange rate changes on Cash and cash equivalents and Restricted cash	(14,724)	(546)	5,070
Change in cash included in current assets held for sale	288,126	195,787	184,578
Net change in Cash and cash equivalents and Restricted cash	(521,723)	769,481	(27,800)
Cash and cash equivalents and Restricted cash at beginning of period	867,298	97,817	125,617
Cash and cash equivalents and Restricted cash at end of period	$ 345,575	$ 867,298	$ 97,817