Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income (loss)	$ 126,800	$ 187,774	$ (260,726)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	714,345	498,134	453,935
Stock-based compensation	155,567	132,443	117,990
Excess tax benefits from stock-based compensation	(2,773)	(30)	(19,582)
Amortization of intangible assets	122,862	27,446	27,756
Amortization of debt issuance costs and debt discounts	19,137	16,050	18,667
Provision for allowance for doubtful accounts	8,260	5,037	7,093
Gain on asset sales	(32,816)	0	0
Gain on sale of discontinued operations	(2,351)	0	0
Impairment charges	7,698	0	0
Loss on debt extinguishment	12,276	289	156,990
Other items	20,609	16,490	19,912
Changes in operating assets and liabilities:
Accounts receivable	(100,230)	(44,583)	(101,966)
Income taxes, net	29,020	(109,579)	226,774
Other assets	(72,831)	(70,371)	(6,496)
Accounts payable and accrued expenses	61,565	109,125	10,681
Other liabilities	(50,558)	126,568	38,392
Net cash provided by operating activities	1,016,580	894,793	689,420
Cash flows from investing activities:
Purchases of investments	(42,325)	(359,031)	(545,997)
Sales and maturities of investments	53,164	873,139	785,548
Business acquisitions, net of cash acquired	(1,766,907)	(245,553)	0
Purchases of real estate	(28,118)	(38,282)	(16,791)
Purchases of other property, plant and equipment	(1,113,365)	(868,120)	(660,203)
Proceeds from sale of assets, net of cash transferred	851,582	0	0
Increase in restricted cash	(21,901)	(512,319)	(968)
Release of restricted cash	475,715	15,239	2,572
Net cash used in investing activities	(1,592,155)	(1,134,927)	(435,839)
Cash flows from financing activities:
Purchases of treasury stock	0	0	(297,958)
Proceeds from employee equity awards	34,179	30,040	29,320
Excess tax benefits from stock-based compensation	2,773	30	19,582
Payment of dividends and special distribution	(499,463)	(521,461)	(83,266)
Purchase of non-controlling interests	0	0	(226,276)
Proceeds from public offering of common stock, net of issuance costs	0	829,496	0
Proceeds from senior notes	0	1,100,000	1,250,000
Proceeds from loans payable	1,168,304	1,197,108	508,826
Repayment of senior notes	0	0	(750,000)
Repayment of convertible debt	(51)	0	(29,513)
Repayment of capital lease and other financing obligations	(114,385)	(28,663)	(18,030)
Repayment of mortgage and loans payable	(1,462,888)	(715,270)	(153,473)
Debt extinguishment costs	(11,380)	0	(116,517)
Debt issuance costs	(11,381)	(18,098)	(25,294)
Net cash provided by (used in) financing activities	(894,292)	1,873,182	107,401
Effect of foreign currency exchange rates on cash and cash equivalents	(10,495)	(15,127)	(11,959)
Net increase (decrease) in cash and cash equivalents	(1,480,362)	1,617,921	349,023
Cash and cash equivalents at beginning of period	2,228,838	610,917	261,894
Cash and cash equivalents at end of period	748,476	2,228,838	610,917
Supplemental cash flow information
Cash paid for taxes	39,320	132,302	117,197
Cash paid for interest	$ 350,083	$ 237,410	$ 262,018