Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities
Net (loss) income	$ (997,742)	$ 877,087
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	116,117	146,284
Amortization of operating lease right-of-use assets	68,229	95,566
Loss on impairment of assets	990,258	25,470
Loss (gain) on sales of subsidiaries and disposal of property and equipment, net	317,224	(814,202)
Loss (gain) on derivative instruments	626	(8,260)
Payments for settlement of derivative contracts	(626)	(8,233)
Loss on debt extinguishment	0	26,901
Non-cash interest expense	14,075	3,386
Interest paid on deferred purchase price for acquisitions	(3,969)	0
Non-cash share-based compensation expense	10,277	9,581
Bad debt expense	97,662	80,957
Deferred income taxes	(264,381)	(3,107)
Unrealized foreign currency exchange (gain) loss	(15,355)	8,434
Non-cash loss from non-income tax contingencies	3,375	5,196
Other, net	1,917	(6,849)
Changes in operating assets and liabilities:
Receivables	(325,106)	(273,830)
Prepaid expenses and other assets	(47,616)	(56,726)
Accounts payable and accrued expenses	(50,545)	(14,102)
Income tax receivable/payable, net	(56,875)	(39,734)
Deferred revenue and other liabilities	364,210	258,449
Net cash provided by operating activities	221,755	312,268
Cash flows from investing activities
Purchase of property and equipment	(62,347)	(102,147)
Expenditures for deferred costs	(11,955)	(12,086)
Receipts from sales of discontinued operations, net of cash sold, and property and equipment	40,148	1,141,695
Settlement of derivatives related to sale of discontinued operations and net investment hedge	0	12,866
Business acquisitions, net of cash acquired	0	(1,205)
(Payments to) receipts from related parties	(3)	84
Proceeds from sale of investment	0	11,473
Net cash (used in) provided by investing activities	(34,157)	1,050,680
Cash flows from financing activities
Proceeds from issuance of long-term debt, net of original issue discount	566,726	724,074
Payments on long-term debt	(298,664)	(2,189,779)
Payments of deferred purchase price for acquisitions	(5,680)	(19,787)
Payments to purchase noncontrolling interests	0	(5,761)
Proceeds from exercise of stock options	26,697	1,714
Withholding of shares to satisfy tax withholding for vested stock awards and exercised stock options	(1,150)	(1,509)
Payments to repurchase common stock	(29,203)	(87,921)
Payments of debt issuance costs	(726)	(6,557)
Distributions to noncontrolling interest holders	(609)	(2,032)
Net cash provided by (used in) financing activities	257,391	(1,587,558)
Effects of exchange rate changes on Cash and cash equivalents and Restricted cash	(13,448)	(2,961)
Change in cash included in current assets held for sale	218,298	230,208
Net change in Cash and cash equivalents and Restricted cash	649,839	2,637
Cash and cash equivalents and Restricted cash at beginning of period	97,817	125,617
Cash and cash equivalents and Restricted cash at end of period	$ 747,656	$ 128,254