Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income (loss)	$ 187,774	$ (260,726)	$ 96,123
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	498,134	453,935	405,444
Stock-based compensation	132,443	117,990	102,940
Excess tax benefits from stock-based compensation	(30)	(19,582)	(27,330)
Amortization of intangible assets	27,446	27,756	27,027
Amortization of debt issuance costs and debt discounts	16,050	18,667	23,868
Provision for allowance for doubtful accounts	5,037	7,093	5,819
Restructuring charges (reversals)	0	0	(4,837)
Loss on debt extinguishment	289	156,990	108,501
Foreign currency transactions and other, net	16,490	19,912	11,543
Changes in operating assets and liabilities:
Accounts receivable	(44,583)	(101,966)	(27,956)
Income taxes, net	(109,579)	226,774	(108,189)
Other assets	(70,371)	(6,496)	(36,853)
Accounts payable and accrued expenses	109,125	10,681	7,242
Other liabilities	126,568	38,392	21,266
Net cash provided by operating activities	894,793	689,420	604,608
Cash flows from investing activities:
Purchases of investments	(359,031)	(545,997)	(968,971)
Sales of investments	837,708	573,582	276,351
Maturities of investments	35,431	211,966	213,484
Business acquisitions, net of cash acquired	(245,553)	0	(49,337)
Purchases of real estate	(38,282)	(16,791)	(74,332)
Purchases of other property, plant and equipment	(868,120)	(660,203)	(572,406)
Increase in restricted cash	(512,319)	(968)	(837,190)
Release of restricted cash	15,239	2,572	843,088
Net cash used in investing activities	(1,134,927)	(435,839)	(1,169,313)
Cash flows from financing activities:
Purchases of treasury stock	0	(297,958)	(48,799)
Proceeds from employee equity awards	30,040	29,320	31,892
Excess tax benefits from stock-based compensation	30	19,582	27,330
Payment of dividends and special distribution	(521,461)	(83,266)	0
Purchase of non-controlling interests	0	(226,276)	0
Proceeds from public offering of common stock, net of issuance costs	829,496	0	0
Proceeds from senior notes	1,100,000	1,250,000	1,500,000
Proceeds from loans payable	1,197,108	508,826	28,038
Repayment of senior notes	0	(750,000)	(750,000)
Repayment of convertible debt	0	(29,513)	0
Repayment of capital lease and other financing obligations	(28,663)	(18,030)	(40,133)
Repayment of mortgage and loans payable	(715,270)	(153,473)	(52,500)
Debt extinguishment costs	0	(116,517)	(97,864)
Debt issuance costs	(18,098)	(25,294)	(23,057)
Net cash provided by financing activities	1,873,182	107,401	574,907
Effect of foreign currency exchange rates on cash and cash equivalents	(15,127)	(11,959)	(521)
Net increase in cash and cash equivalents	1,617,921	349,023	9,681
Cash and cash equivalents at beginning of period	610,917	261,894	252,213
Cash and cash equivalents at end of period	2,228,838	610,917	261,894
Supplemental cash flow information
Cash paid for taxes	132,302	117,197	123,690
Cash paid for interest	$ 237,410	$ 262,018	$ 210,629