Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities
Net income	$ 973,881	$ 395,501
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	97,384	130,164
Amortization of operating lease right-of-use assets	62,788
Loss on impairment of assets	470	0
Gain on sales of subsidiaries and disposal of property and equipment, net	(852,348)	(309,918)
Gain on derivative instruments	(7,977)	(92,680)
Payments for settlement of derivative contracts	(8,233)	0
Loss on debt extinguishment	26,217	7,481
Non-cash interest expense	(317)	11,023
Non-cash share-based compensation expense	8,004	3,931
Bad debt expense	62,410	58,282
Deferred income taxes	4,744	(660)
Unrealized foreign currency exchange (gain) loss	(5,246)	18,721
Non-cash loss (gain) from non-income tax contingencies	4,609	(928)
Other, net	(4,117)	(10,032)
Changes in operating assets and liabilities:
Receivables	(221,719)	(184,005)
Prepaid expenses and other assets	(78,740)	(83,347)
Accounts payable and accrued expenses	(33,562)	(54,020)
Income tax receivable/payable, net	(53,183)	11,951
Deferred revenue and other liabilities	57,482	100,372
Net cash provided by operating activities	32,547	1,836
Cash flows from investing activities
Purchase of property and equipment	(62,801)	(93,741)
Expenditures for deferred costs	(8,022)	(7,732)
Receipts from sales of discontinued operations, net of cash sold, property and equipment and other	1,161,440	374,713
Settlement of derivatives related to sale of discontinued operations and net investment hedge	12,866	(9,960)
Business acquisitions, net of cash acquired	(1,205)	0
Payments from related parties	87	983
Net cash provided by investing activities	1,102,365	264,263
Cash flows from financing activities
Proceeds from issuance of long-term debt, net of original issue discount	507,691	298,726
Payments on long-term debt	(1,877,310)	(671,721)
Payments of deferred purchase price for acquisitions	(12,133)	(5,875)
Payments to purchase noncontrolling interests	(5,761)	(127)
Payment of dividends on Series A Preferred Stock	0	(11,103)
Withholding of shares to satisfy tax withholding for vested stock awards	(1,251)	(1,744)
Payments of debt issuance costs and redemption premiums	(5,949)	(303)
Distributions to noncontrolling interest holders	(1,363)	(912)
Net cash used in financing activities	(1,396,076)	(393,059)
Effects of exchange rate changes on Cash and cash equivalents and Restricted cash	8,651	3,822
Change in cash included in current assets held for sale	88,073	14,082
Net change in Cash and cash equivalents and Restricted cash	(164,440)	(109,056)
Cash and cash equivalents and Restricted cash at beginning of period	589,790	532,782
Cash and cash equivalents and Restricted cash at end of period	$ 425,350	$ 423,726