Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities
Net income (loss)	$ (106,745)	$ 327,722
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization	199,394	202,735
Loss (gain) on sale of subsidiary and disposal of property and equipment	3,050	(398,499)
(Gain) loss on derivative instruments	(19,621)	7,211
Loss on debt extinguishment	8,425	17,363
Payment of redemption and call premiums and fees on debt modification	(65,225)	0
Non-cash interest expense	29,809	36,892
Interest paid on deferred purchase price for acquisitions	(39,419)	0
Non-cash share-based compensation expense	43,969	28,939
Bad debt expense	88,677	76,141
Deferred income taxes	(21,787)	(12,309)
Unrealized foreign currency exchange loss (gain)	4,852	(73,641)
Non-cash loss from non-income tax contingencies	4,032	6,016
Other, net	1,637	1,574
Changes in operating assets and liabilities:
Restricted cash	(1,743)	(6,826)
Receivables	(344,661)	(350,078)
Prepaid expenses and other assets	(69,843)	(28,236)
Accounts payable and accrued expenses	14,624	(10,655)
Income tax receivable/payable, net	(19,815)	(23,550)
Deferred revenue and other liabilities	435,173	395,171
Net cash provided by operating activities	144,783	195,970
Cash flows from investing activities
Purchase of property and equipment	(134,629)	(132,904)
Expenditures for deferred costs	(12,712)	(13,996)
Receipts from sale of subsidiary and property and equipment	1,180	553,860
Property insurance recoveries	370	1,431
Settlement of derivatives related to sale of subsidiaries	0	(5,663)
Business acquisitions, net of cash acquired	(835)	0
Payments from related parties	349	1,634
Change in restricted cash and investments	(3,921)	(12,032)
Net cash (used in) provided by investing activities	(150,198)	392,330
Cash flows from financing activities
Proceeds from issuance of long-term debt, net of original issue discount	2,349,673	513,014
Payments on long-term debt	(2,695,511)	(1,037,591)
Payments of deferred purchase price for acquisitions	(93,813)	(9,574)
Payments to purchase noncontrolling interests	0	(25,665)
Proceeds from issuance of convertible redeemable preferred stock, net of issuance costs	55,290	0
Payment of dividends on Series A Preferred Stock and to noncontrolling interests	(5,252)	(550)
Proceeds from initial public offering, net of issuance costs	456,359	0
Proceeds from exercise of stock options	0	252
Withholding of shares to satisfy tax withholding for vested stock awards and exercised stock options	(1,725)	(1,346)
Payments of debt issuance costs	(11,298)	(10,593)
Noncontrolling interest holder's loan to subsidiaries	943	816
Distributions to noncontrolling interest holders	(847)	(1,447)
Net cash provided by (used in) financing activities	53,819	(572,684)
Effects of exchange rate changes on cash	26,127	7,182
Change in cash included in current assets held for sale	(34,534)	0
Net change in cash and cash equivalents	39,997	22,798
Cash and cash equivalents at beginning of period	464,965	458,673
Cash and cash equivalents at end of period	$ 504,962	$ 481,471