Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities
Net income (loss)	$ 171,545	$ (120,353)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	67,762	64,514
(Gain) loss on sales of subsidiaries and disposal of property and equipment, net	(297,479)	345
Loss (gain) on derivative instruments	19,132	(12,267)
Loss on debt extinguishment	7,481	467
Non-cash interest expense	4,645	12,233
Non-cash share-based compensation expense	(3,756)	22,388
Bad debt expense	22,153	16,502
Deferred income taxes	(26,560)	(15,882)
Unrealized foreign currency exchange loss	1,082	1,079
Non-cash loss from non-income tax contingencies	2,121	4,037
Other, net	(315)	1,919
Changes in operating assets and liabilities:
Receivables	(268,434)	(267,480)
Prepaid expenses and other assets	(20,158)	(43,773)
Accounts payable and accrued expenses	(61,087)	(51,855)
Income tax receivable/payable, net	(14,810)	(8,907)
Deferred revenue and other liabilities	389,602	360,635
Net cash used in operating activities	(7,076)	(36,398)
Cash flows from investing activities
Purchase of property and equipment	(44,245)	(37,147)
Expenditures for deferred costs	(3,365)	(3,476)
Receipts from sales of subsidiaries and property and equipment, net of cash sold	359,510	126
Settlement of derivatives related to sale of subsidiaries	(9,960)	0
Property insurance recoveries	0	370
Payments from (to) related parties and affiliates	750	(347)
Net cash provided by (used in) investing activities	302,690	(40,474)
Cash flows from financing activities
Proceeds from issuance of long-term debt, net of original issue discount	188,563	6,790
Payments on long-term debt	(541,812)	(50,335)
Payments of deferred purchase price for acquisitions	(5,534)	(5,315)
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	(9,719)	0
Proceeds from initial public offering, net of issuance costs	0	456,888
Withholding of shares to satisfy tax withholding for vested stock awards	(803)	0
Payments of debt issuance costs	(148)	(600)
Noncontrolling interest holder's loan to subsidiaries	0	943
Distributions from noncontrolling interest holders	581	454
Net cash (used in) provided by financing activities	(368,999)	464,115
Effects of exchange rate changes on Cash and cash equivalents and Restricted cash	20,133	10,618
Change in cash included in current assets held for sale	23,585	0
Net change in Cash and cash equivalents and Restricted cash	(29,667)	397,861
Cash and cash equivalents and Restricted cash at beginning of period	693,667	654,284
Cash and cash equivalents and Restricted cash at end of period	$ 664,000	$ 1,052,145