Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities
Net (loss) income	$ (213,312)	$ 973,881
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	84,276	97,384
Amortization of operating lease right-of-use assets	49,475	62,788
Loss on impairment of assets	458,820	470
Loss (gain) on sales of subsidiaries and disposal of property and equipment, net	26,068	(852,348)
Loss (gain) on derivative instruments	626	(7,977)
Payments for settlement of derivative contracts	(626)	(8,233)
Loss on debt extinguishment	0	26,217
Non-cash interest expense	8,828	(317)
Non-cash share-based compensation expense	6,605	8,004
Bad debt expense	63,695	62,410
Deferred income taxes	(226,841)	4,744
Unrealized foreign currency exchange gain	(25,597)	(5,246)
Non-cash loss from non-income tax contingencies	5,952	4,609
Other, net	670	(4,117)
Changes in operating assets and liabilities:
Receivables	(139,873)	(221,719)
Prepaid expenses and other assets	(18,166)	(78,740)
Accounts payable and accrued expenses	(100,296)	(33,562)
Income tax receivable/payable, net	(46,314)	(53,183)
Deferred revenue and other liabilities	127,371	57,482
Net cash provided by operating activities	61,361	32,547
Cash flows from investing activities
Purchase of property and equipment	(49,163)	(62,801)
Expenditures for deferred costs	(8,335)	(8,022)
Receipts from sales of discontinued operations, net of cash sold, and property and equipment	22,454	1,161,440
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	(1)	87
Net cash (used in) provided by investing activities	(35,045)	1,102,365
Cash flows from financing activities
Proceeds from issuance of long-term debt, net of original issue discount	525,187	507,691
Payments on long-term debt	(256,299)	(1,877,310)
Payments of deferred purchase price for acquisitions	(1,858)	(12,133)
Payments to purchase noncontrolling interests	0	(5,761)
Proceeds from exercise of stock options	26,732	0
Withholding of shares to satisfy tax withholding for vested stock awards and exercised stock options	(1,150)	(1,251)
Payments to repurchase common stock	(29,203)	0
Payments of debt issuance costs	0	(5,949)
Distributions to noncontrolling interest holders	0	(1,363)
Net cash provided by (used in) financing activities	263,409	(1,396,076)
Effects of exchange rate changes on Cash and cash equivalents and Restricted cash	(23,265)	8,651
Change in cash included in current assets held for sale	22,243	64,266
Net change in Cash and cash equivalents and Restricted cash	288,703	(188,247)
Cash and cash equivalents and Restricted cash at beginning of period	526,550	583,572
Cash and cash equivalents and Restricted cash at end of period	$ 815,253	$ 395,325