Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities
Net income (loss)	$ 298,814	$ (106,745)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	189,961	199,394
Loss on impairment of assets	10,030	0
(Gain) loss on sales of subsidiaries and disposal of property and equipment, net	(292,999)	3,050
Gain on derivative instruments	(92,749)	(19,621)
Proceeds from settlement of derivative contracts	14,117	0
Loss on debt extinguishment	7,481	8,425
Non-cash interest expense	14,651	29,809
Interest paid on deferred purchase price for acquisitions	0	(39,419)
Non-cash share-based compensation expense	10,492	43,969
Bad debt expense	83,029	88,677
Deferred income taxes	(389)	(21,787)
Unrealized foreign currency exchange loss	53,731	4,852
Non-cash (gain) loss from non-income tax contingencies	(843)	4,032
Other, net	(11,607)	1,637
Changes in operating assets and liabilities:
Receivables	(288,747)	(344,661)
Prepaid expenses and other assets	(50,919)	(69,843)
Accounts payable and accrued expenses	(6,263)	14,624
Income tax receivable/payable, net	(10,084)	(19,815)
Deferred revenue and other liabilities	428,664	435,173
Net cash provided by operating activities	356,370	211,751
Cash flows from investing activities
Purchase of property and equipment	(150,458)	(134,629)
Expenditures for deferred costs	(13,182)	(12,712)
Receipts from sales of discontinued operations and property and equipment, net of cash sold	375,792	1,180
Settlement of derivatives related to sale of discontinued operations	(9,960)	0
Proceeds from corporate-owned life insurance and property insurance recoveries	24,641	370
Business acquisitions, net of cash acquired	0	(835)
Payments (to) from related parties and investments in affiliates	(8)	349
Net cash provided by (used in) investing activities	226,825	(146,277)
Cash flows from financing activities
Proceeds from issuance of long-term debt, net of original issue discount	383,594	2,349,673
Payments on long-term debt	(838,542)	(2,695,511)
Payments of deferred purchase price for acquisitions	(17,588)	(93,813)
Payments to purchase noncontrolling interests	(127)	0
Proceeds from issuance of convertible redeemable preferred stock, net of issuance costs	0	55,290
Payment of dividends on Series A Preferred Stock	(11,103)	(5,252)
Proceeds from initial public offering, net of issuance costs	0	456,359
Withholding of shares to satisfy tax withholding for vested stock awards	(1,744)	(1,725)
Payments of debt issuance costs and redemption and call premiums for debt modification	(490)	(76,523)
Noncontrolling interest holder's loan to subsidiaries	0	943
Distributions to noncontrolling interest holders	(912)	(847)
Net cash used in financing activities	(486,912)	(11,406)
Effects of exchange rate changes on Cash and cash equivalents and Restricted cash	(4,535)	25,965
Change in cash included in current assets held for sale	(35,392)	(68,100)
Net change in Cash and cash equivalents and Restricted cash	56,356	11,933
Cash and cash equivalents and Restricted cash at beginning of period	532,782	474,337
Cash and cash equivalents and Restricted cash at end of period	$ 589,138	$ 486,270