CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income (loss)	$ 61,212	$ (226,953)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization (including impairments)	1,130,048	1,291,232
Equity in net loss of affiliates	0	10,849
Loss (gain) on investments and sale of affiliate interests, net	(357,871)	293,715
Loss (gain) on derivative contracts, net	226,653	(210,511)
Loss on extinguishment of debt and write-off of deferred financing costs	159,096	41,616
Amortization of deferred financing costs and discounts (premiums) on indebtedness	53,876	36,971
Settlement loss related to pension plan	538	864
Share-based compensation expense related to equity classified awards	29,867	33,849
Deferred income taxes	19,604	(80,280)
Provision for doubtful accounts	34,814	29,462
Change in assets and liabilities, net of effects of acquisitions and dispositions:
Accounts receivable, trade	1,804	(37,224)
Other receivables	2,740	(5,926)
Prepaid expenses and other assets	(39,477)	(31,951)
Amounts due from and due to affiliates	(3,282)	8,573
Accounts payable	18,549	49,449
Interest payable, accrued employee related costs and other liabilities	(98,551)	(110,227)
Deferred revenue	12,022	20,536
Liabilities related to interest rate swap and derivative contracts	41,322	45,199
Net cash provided by operating activities	1,292,964	1,159,243
Cash flows from investing activities:
Capital expenditures	(657,253)	(498,297)
Payment for acquisitions, net of cash acquired	(172,659)	(5,308)
Sale of affiliate interest	0	(3,537)
Proceeds related to sale of equipment, including costs of disposal	898	6,858
Increase in other investments	0	(2,500)
Additions to other intangible assets	867	0
Net cash used in investing activities	(829,881)	(502,784)
Cash flows from financing activities:
Proceeds from credit facility debt, net of discounts	1,940,000	1,642,500
Repayment of credit facility debt	(602,830)	(621,325)
Issuance of senior notes and debentures, including premiums	1,754,375	2,050,000
Redemption of senior notes, including premiums and fees	(2,462,692)	(2,123,756)
Proceeds from collateralized indebtedness, net	0	337,124
Repayment of collateralized indebtedness and related derivative contracts, net	0	337,124
Dividends to stockholders	0	1,499,935
Proceeds from notes payable	39,856	0
Repayment of notes payable	(74,061)	(446)
Principal payments on finance lease obligations	(3,273)	(6,019)
Purchase of shares of Class A common stock, pursuant to a share repurchase program	(1,199,953)	0
Additions to deferred financing costs	(12,488)	(22,277)
Contingent payment for acquisition	(500)	(28,940)
Contributions from (distributions to) noncontrolling interests	(1,000)	5,995
Other	0	(859)
Net cash used in financing activities	(622,566)	(605,062)
Net increase (decrease) in cash and cash equivalents	(159,483)	51,397
Effect of exchange rate changes on cash and cash equivalents	(580)	(104)
Net increase (decrease) in cash and cash equivalents	(160,063)	51,293
Cash, cash equivalents and restricted cash at beginning of year	299,038	330,100
Cash, cash equivalents and restricted cash at end of period	$ 138,975	$ 381,393