Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income	$ 87,867	$ 13,600
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	392,617	352,130
Stock-based compensation	83,948	73,384
Amortization of intangible assets	79,175	60,455
Amortization of debt issuance costs and debt discounts	15,710	11,025
Provision for allowance for doubtful accounts	7,989	3,648
Gain on asset sales	0	(5,242)
Loss on debt extinguishment	19,947	318
Other items	3,773	11,821
Changes in operating assets and liabilities:
Accounts receivable	(151,900)	(42,367)
Income taxes, net	(33,927)	(23,755)
Accounts payable and accrued expenses	16,171	(10,625)
Other assets and liabilities	32,474	(61,294)
Net cash provided by operating activities	553,844	383,098
Cash flows from investing activities:
Purchases of investments	(26,257)	(16,482)
Sales and maturities of investments	29,456	28,665
Business acquisitions, net of cash and restricted cash acquired	(3,629,654)	(1,601,326)
Purchases of real estate	(48,580)	(28,118)
Purchases of other property, plant and equipment	(625,814)	(447,567)
Proceeds from sale of assets	47,767	22,825
Net cash used in investing activities	(4,253,082)	(2,042,003)
Cash flows from financing activities:
Proceeds from employee equity awards	20,119	17,639
Payment of dividends	(304,373)	(246,694)
Proceeds from public offering of common stock, net of offering costs	2,126,341	0
Proceeds from senior notes	1,250,000	0
Proceeds from loans payable	1,059,800	701,250
Repayment of capital lease and other financing obligations	(44,460)	(45,335)
Repayment of convertible debt, mortgage, and loans payable	(42,305)	(973,111)
Debt extinguishment costs	(11,254)	0
Debt issuance costs	(40,619)	(42)
Other financing activities	(900)	0
Net cash provided by (used) in financing activities	4,012,349	(546,293)
Effect of foreign currency exchange rates on cash, cash equivalents and restricted cash	16,868	8,639
Change in cash balances included in assets held for sale	0	(25,111)
Net increase (decrease) in cash, cash equivalents and restricted cash	329,979	(2,221,670)
Cash, cash equivalents and restricted cash at beginning of period	773,247	2,718,427
Cash, cash equivalents and restricted cash at end of period	1,103,226	496,757
Cash and cash equivalents	1,063,777	483,160
Current portion of restricted cash included in other current assets	28,965	3,411
Non-current portion of restricted cash included in other assets	$ 10,484	$ 10,186