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Debt (Details) - USD ($) $ in Thousands	6 Months Ended
Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Debt Instrument [Line Items]
Repayments of Debt	$ 268,200	$ 17,600
Letters of Credit Outstanding, Amount	33,300
Unamortized debt issuance costs	(34,684)		$ (38,071)
Total debt	3,589,292		3,472,653
Less: Current maturities of long-term debt	(95,623)		(337,337)
Total long-term debt	3,493,669		3,135,316
October 2018
Debt Instrument [Line Items]
Line of Credit Facility, Increase (Decrease), Net	175,000
December 2022
Debt Instrument [Line Items]
Repayments of Debt	8,400
Term Loan	666,563		675,000
Bank Credit Facility	370,000
Letters of Credit Outstanding, Amount			0
Line of Credit Facility, Increase (Decrease), Net	185,000
Term Loan [Member]
Debt Instrument [Line Items]
Repayments of Debt	200
Line of Credit Facility, Increase (Decrease), Net	10,000	$ 110,000
Unsecured Debt
Debt Instrument [Line Items]
Unamortized pricing discounts and other	7,014		7,456
Unsecured Debt \| October 2018
Debt Instrument [Line Items]
Senior Notes	0		250,000
Unsecured Debt \| November 2020
Debt Instrument [Line Items]
Senior Notes	200,000		200,000
Unsecured Debt \| November 2021
Debt Instrument [Line Items]
Senior Notes	150,000		150,000
Unsecured Debt \| January 2022
Debt Instrument [Line Items]
Senior Notes	425,000		425,000
Unsecured Debt \| May 2024
Debt Instrument [Line Items]
Senior Notes	850,000		850,000
Unsecured Debt \| April 2027
Debt Instrument [Line Items]
Senior Notes	200,000		200,000
Unsecured Debt \| December 2027
Debt Instrument [Line Items]
Senior Notes	550,000		550,000
Capital Lease Obligations
Debt Instrument [Line Items]
Obligations under capital leases	199,554		197,232
Mortgages [Member]
Debt Instrument [Line Items]
Mortgage notes and other debt	$ 5,845		$ 6,036