Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities
Net (loss) income	$ (164,943)	$ 98,316
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	22,672	44,161
Amortization of operating lease right-of-use assets	15,688	23,257
Loss on impairment of assets	57,714	3,768
Loss on sales and disposal of subsidiaries and property and equipment, net	16,461	21,175
Gain on derivative instruments	(29,330)	(802)
Loss on debt extinguishment	73	0
Non-cash interest expense	4,592	5,091
Non-cash share-based compensation expense	1,576	1,984
Bad debt expense	3,273	22,912
Deferred income taxes	84,409	(248,701)
Unrealized foreign currency exchange gain	(23,687)	(29,720)
Non-cash loss from non-income tax contingencies	11,995	6,514
Other, net	1,909	3,982
Changes in operating assets and liabilities:
Receivables	5,111	(173,760)
Prepaid expenses and other assets	(14,133)	(32,084)
Accounts payable and accrued expenses	(30,733)	(64,924)
Income tax receivable/payable, net	(16,731)	2,709
Deferred revenue and other liabilities	65,367	312,593
Net cash provided by (used in) operating activities	11,283	(3,529)
Cash flows from investing activities
Purchase of property and equipment	(11,743)	(24,582)
Expenditures for deferred costs	(1,896)	(3,500)
Receipts from sales of discontinued operations, net of cash sold, and property and equipment	30,845	4,032
Payments on derivatives related to sale of discontinued operations	(18,294)	0
Receipts from related parties	0	87
Net cash used in investing activities	(1,088)	(23,963)
Cash flows from financing activities
Proceeds from issuance of long-term debt, net of original issue discount	996	499,479
Payments on long-term debt	(53,670)	(226,505)
Payments of deferred purchase price for acquisitions	0	(1,488)
Proceeds from exercise of stock options	0	26,754
Withholding of shares to satisfy tax withholding for vested stock awards and exercised stock options	(1,222)	(1,140)
Payments to repurchase common stock	(145,244)	(29,203)
Payments of debt issuance costs	(14)	0
Net cash (used in) provided by financing activities	(199,154)	267,897
Effects of exchange rate changes on Cash and cash equivalents and Restricted cash	(6,850)	(7,706)
Change in cash included in current assets held for sale	(3,526)	10,092
Net change in Cash and cash equivalents and Restricted cash	(199,335)	242,791
Cash and cash equivalents and Restricted cash at beginning of period	867,298	97,817
Cash and cash equivalents and Restricted cash at end of period	$ 667,963	$ 340,608