Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net income	$ 13,600	$ 135,911
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	352,130	236,267
Stock-based compensation	73,384	64,606
Amortization of intangible assets	60,455	12,745
Amortization of debt issuance costs and debt discounts	11,025	7,585
Provision for allowance for doubtful accounts	3,648	2,890
Gains on asset sales	(5,242)	0
Loss on debt extinguishment	(318)	0
Other items	11,821	8,006
Changes in operating assets and liabilities:
Accounts receivable	(42,367)	(41,782)
Income taxes, net	(23,755)	(66,147)
Accounts payable and accrued expenses	(10,625)	49,293
Other assets and liabilities	(61,294)	35,900
Net cash provided by operating activities	383,098	445,274
Cash flows from investing activities:
Purchases of investments	(16,482)	(324,292)
Sales of investments	28,665	718,121
Maturities of investments	0	35,431
Business acquisitions, net of cash acquired	(1,601,627)	(10,247)
Purchases of real estate	(28,118)	(38,282)
Purchases of other property, plant and equipment	(447,567)	(371,462)
Proceeds from sale of assets	22,825	0
Changes in restricted cash	466,587	(507,645)
Net cash used in investing activities	(1,575,717)	(498,376)
Cash flows from financing activities:
Proceeds from employee equity awards	17,639	16,565
Payment of dividends	(246,694)	(192,968)
Proceeds from loans payable	701,250	490,000
Repayment of capital lease and other financing obligations	(45,335)	(13,638)
Repayment of mortgage and loans payable	(973,111)	(518,629)
Other financing activities	(42)	314
Net cash used in financing activities	(546,293)	(218,356)
Effect of foreign currency exchange rates on cash and cash equivalents	18,345	(3,326)
Change in cash balances included in assets held for sale	(25,111)	0
Net decrease in cash and cash equivalents	(1,745,678)	(274,784)
Cash and cash equivalents at beginning of period	2,228,838	610,917
Cash and cash equivalents at end of period	$ 483,160	$ 336,133