Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities
Net loss	$ (194,167)	$ (213,312)
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	49,689	84,276
Amortization of operating lease right-of-use assets	27,003	49,475
Loss on impairment of assets	65,137	448,852
(Gain) loss on sales and disposal of subsidiaries and property and equipment, net	(13,516)	36,036
Loss on derivative instruments	24,517	626
Payments for settlement of derivative contracts	0	(626)
Loss on debt extinguishment	77,999	0
Non-cash interest expense	5,662	8,828
Non-cash share-based compensation expense	4,778	6,605
Bad debt expense	21,372	63,695
Deferred income taxes	66,965	(226,841)
Unrealized foreign currency exchange gain	(13,455)	(25,597)
Non-cash loss from non-income tax contingencies	11,925	5,952
Other, net	(3,879)	670
Changes in operating assets and liabilities:
Receivables	(43,148)	(139,873)
Prepaid expenses and other assets	(13,558)	(18,166)
Accounts payable and accrued expenses	(33,013)	(100,296)
Income tax receivable/payable, net	(17,859)	(46,314)
Deferred revenue and other liabilities	(4,600)	127,371
Net cash provided by operating activities	17,852	61,361
Cash flows from investing activities
Purchase of property and equipment	(20,551)	(49,163)
Expenditures for deferred costs	(4,444)	(8,335)
Receipts from sales of discontinued operations, net of cash sold, and property and equipment	725,323	22,454
Payments on derivatives related to sale of discontinued operations	(50,341)	0
Payments to related parties	0	(1)
Net cash provided by (used in) investing activities	649,987	(35,045)
Cash flows from financing activities
Proceeds from issuance of long-term debt, net of original issue discount	55,394	525,187
Payments on long-term debt	(932,901)	(256,299)
Payments of deferred purchase price for acquisitions	0	(1,858)
Proceeds from exercise of stock options	374	26,732
Withholding of shares to satisfy tax withholding for vested stock awards and exercised stock options	(1,236)	(1,150)
Payments to repurchase common stock	(251,374)	(29,203)
Payments of call premiums and debt issuance costs	(32,980)	0
Net cash (used in) provided by financing activities	(1,162,723)	263,409
Effects of exchange rate changes on Cash and cash equivalents and Restricted cash	(3,438)	(3,904)
Change in cash included in current assets held for sale	164,936	(66,508)
Net change in Cash and cash equivalents and Restricted cash	(333,386)	219,313
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	$ 533,912	$ 317,130