Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities
Net income	$ 877,087	$ 298,814
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	146,284	189,961
Amortization of operating lease right-of-use assets	95,566
Loss on impairment of assets	25,470	10,030
Gain on sales of subsidiaries and disposal of property and equipment, net	(814,202)	(292,999)
Gain on derivative instruments	(8,260)	(92,749)
(Payments for) proceeds from settlement of derivative contracts	(8,233)	14,117
Loss on debt extinguishment	26,901	7,481
Non-cash interest expense	3,386	14,651
Non-cash share-based compensation expense	9,581	10,492
Bad debt expense	80,957	83,029
Deferred income taxes	(3,107)	(389)
Unrealized foreign currency exchange loss	8,434	53,731
Non-cash loss (gain) from non-income tax contingencies	5,196	(843)
Other, net	(6,849)	(11,607)
Changes in operating assets and liabilities:
Receivables	(273,830)	(288,747)
Prepaid expenses and other assets	(56,726)	(50,919)
Accounts payable and accrued expenses	(14,102)	(6,263)
Income tax receivable/payable, net	(39,734)	(10,084)
Deferred revenue and other liabilities	258,449	428,664
Net cash provided by operating activities	312,268	356,370
Cash flows from investing activities
Purchase of property and equipment	(102,147)	(150,458)
Expenditures for deferred costs	(12,086)	(13,182)
Receipts from sales of discontinued operations, net of cash sold, property and equipment and other	1,141,695	375,792
Settlement of derivatives related to sale of discontinued operations and net investment hedge	12,866	(9,960)
Proceeds from corporate-owned life insurance and property insurance recoveries	0	24,641
Business acquisitions, net of cash acquired	(1,205)	0
Payments from (to) related parties	84	(8)
Proceeds from sale of investment	11,473	0
Net cash provided by investing activities	1,050,680	226,825
Cash flows from financing activities
Proceeds from issuance of long-term debt, net of original issue discount	724,074	383,594
Payments on long-term debt	(2,189,779)	(838,542)
Payments of deferred purchase price for acquisitions	(19,787)	(17,588)
Payments to purchase noncontrolling interests	(5,761)	(127)
Payment of dividends on Series A Preferred Stock	0	(11,103)
Proceeds from exercise of stock options	1,714	0
Payments to repurchase common stock	(87,921)	0
Withholding of shares to satisfy tax withholding for vested stock awards and exercised stock options	(1,509)	(1,744)
Payments of debt issuance costs	(6,557)	(490)
Payments to purchase noncontrolling interests	(2,032)	(912)
Net cash used in financing activities	(1,587,558)	(486,912)
Effects of exchange rate changes on Cash and cash equivalents and Restricted cash	(8,808)	(4,534)
Change in cash included in current assets held for sale	157,595	(41,233)
Net change in Cash and cash equivalents and Restricted cash	(75,823)	50,516
Cash and cash equivalents and Restricted cash at beginning of period	583,572	525,745
Cash and cash equivalents and Restricted cash at end of period	$ 507,749	$ 576,261