Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities
Net income	$ 937,664	$ 370,930	$ 93,764
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	193,356	239,998	264,742
Amortization of operating lease right-of-use assets	122,673	0	0
Loss on impairment of assets	43,754	13,110	40,597
Gain on sales and disposal of subsidiaries and property and equipment, net	(796,333)	(292,108)	(5,837)
Gain on derivative instruments	(7,438)	(89,143)	(29,278)
(Payments for) proceeds from settlement of derivative contracts	(8,772)	14,117	0
Loss on debt extinguishment	28,752	7,481	8,392
Non-cash interest expense	3,535	15,408	49,582
Interest paid on deferred purchase price for acquisitions	(5,305)	(4,463)	(39,419)
Non-cash share-based compensation expense	12,994	10,791	64,788
Bad debt expense	100,829	112,440	124,308
Deferred income taxes	(29,813)	(7,474)	(164,785)
Unrealized foreign currency exchange loss	29,186	37,796	4,135
Non-cash loss (gain) from non-income tax contingencies	9,075	6,839	(2,883)
Other, net	(5,341)	(10,297)	3,463
Changes in operating assets and liabilities:
Receivables	(163,202)	(83,316)	(129,335)
Prepaid expenses and other assets	(42,047)	(39,347)	(60,051)
Accounts payable and accrued expenses	5,574	(7,512)	(30,407)
Income tax receivable/payable, net	(36,220)	48,875	(10,695)
Deferred revenue and other liabilities	(53,152)	52,733	11,076
Net cash provided by operating activities	339,769	396,858	192,157
Cash flows from investing activities
Purchase of property and equipment	(155,641)	(238,046)	(274,063)
Expenditures for deferred costs	(17,701)	(19,866)	(19,717)
Receipts from sales of discontinued operations, net of cash sold, property and equipment and other	1,266,042	375,807	9,831
Settlement of derivatives related to sale of discontinued operations and net investment hedge	12,866	(9,960)	0
Proceeds from property insurance recoveries and corporate-owned life insurance	842	27,356	370
Business acquisitions, net of cash acquired	(1,205)	(17,019)	(835)
Payments from (to) related parties and investments in affiliates	84	(2,778)	(268)
Proceeds from sale of investment	11,473	0	0
Net cash provided by (used in) investing activities	1,116,760	115,494	(284,682)
Cash flows from financing activities
Proceeds from issuance of long-term debt, net of original issue discount	1,123,179	485,470	2,898,836
Payments on long-term debt	(2,507,790)	(867,915)	(3,038,946)
Payments of deferred purchase price for acquisitions	(20,157)	(13,650)	(94,891)
Payments to purchase noncontrolling interests	(5,761)	(127)	(17,443)
Proceeds from issuance of convertible redeemable preferred stock, net of issuance costs	0	0	55,290
Payment of dividends on Series A Preferred Stock and to noncontrolling interests	0	(11,103)	(19,371)
Proceeds from initial public offering, net of issuance costs	0	0	456,359
Proceeds from exercise of stock options	14,007	0	0
Payments to repurchase common stock	(264,093)	0	0
Withholding of shares to satisfy tax withholding for vested stock awards and exercised stock options	(2,245)	(2,528)	(2,151)
Payments of debt issuance costs and redemption and call premiums for debt modification	(9,091)	(587)	(81,242)
Noncontrolling interest holder's loan to subsidiaries	0	0	943
Distributions (to) from noncontrolling interest holders	(2,026)	311	186
Net cash (used in) provided by financing activities	(1,673,977)	(410,129)	157,570
Effects of exchange rate changes on Cash and cash equivalents and Restricted cash	(7,338)	(13,481)	25,906
Change in cash included in current assets held for sale	167,764	(30,915)	(32,983)
Net change in Cash and cash equivalents and Restricted cash	(57,022)	57,827	57,968
Cash and cash equivalents and Restricted cash at beginning of period	583,572	525,745	467,777
Cash and cash equivalents and Restricted cash at end of period	$ 526,550	$ 583,572	$ 525,745