Supplemental Balance Sheet, Income Statement and Cash Flow Information - Acquisitions of Businesses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental cash flow information
Cash paid for income taxes	$ 34,479	$ 66,910	$ 166,660
Cash paid for interest, net of capitalized interest	184,445	168,979	164,928
Net change in accounts payable related to capital expenditures	22,920	(59,565)	28,011
Acquisitions of businesses:
Fair value of assets acquired		327,857	59,195
Goodwill		86,502	18,818
Liabilities assumed		(306,084)	(2,796)
Gain on acquisition		(2,308)
Future consideration (fair value)			(24,735)
Payments on future consideration	22,278	22,278	22,278
Cash paid for acquisitions of businesses	22,278	128,245	72,760
Cash acquired in acquisitions of businesses		(48,058)	(226)
Cash paid for acquisition of businesses, net	$ (22,278)	$ (80,187)	$ (72,534)