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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities    
Net income (loss) $ 395,499 $ (3,256)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization 130,164 131,465
(Gain) loss on sales of subsidiaries and disposal of property and equipment, net (309,918) 1,927
Gain on derivative instruments (92,680) (39,386)
Loss on debt extinguishment 7,481 8,430
Non-cash interest expense 11,023 22,359
Non-cash share-based compensation expense 3,931 35,337
Bad debt expense 58,282 51,439
Deferred income taxes (660) (3,196)
Unrealized foreign currency exchange loss 18,721 11,756
Non-cash (gain) loss from non-income tax contingencies (928) 3,813
Other, net (10,032) (1,052)
Changes in operating assets and liabilities:    
Receivables (184,005) (162,375)
Prepaid expenses and other assets (83,347) (99,019)
Accounts payable and accrued expenses (54,020) (86,368)
Income tax receivable/payable, net 11,951 (21,868)
Deferred revenue and other liabilities 100,372 9,231
Net cash provided by (used in) operating activities 1,834 (140,763)
Cash flows from investing activities    
Purchase of property and equipment (93,741) (86,793)
Expenditures for deferred costs (7,732) (8,248)
Receipts from sales of subsidiaries and property and equipment, net of cash sold 374,713 505
Settlement of derivatives related to sale of subsidiaries (9,960) 0
Property insurance recoveries 0 370
Business acquisitions, net of cash acquired 0 (835)
Payments from (to) related parties and affiliates 983 (508)
Net cash provided by (used in) investing activities 264,263 (95,509)
Cash flows from financing activities    
Proceeds from issuance of long-term debt, net of original issue discount 298,726 2,110,859
Payments on long-term debt (671,721) (2,415,530)
Payments of deferred purchase price for acquisitions (5,875) (6,329)
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) 0
Proceeds from initial public offering, net of issuance costs 0 456,561
Withholding of shares to satisfy tax withholding for vested stock awards (1,744) (1,277)
Payments of debt issuance costs and redemption and call premiums for debt modification (303) (76,469)
Noncontrolling interest holder's loan to subsidiaries 0 943
Distributions to noncontrolling interest holders (912) (847)
Net cash (used in) provided by financing activities (393,059) 123,201
Effects of exchange rate changes on Cash and cash equivalents and Restricted cash (12,723) 19,255
Change in cash included in current assets held for sale 31,325 0
Net change in Cash and cash equivalents and Restricted cash (108,360) (93,816)
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 $ 585,307 $ 560,468