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Debt (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Debt Instrument [Line Items]
Repayments of Debt				$ 285,200	$ 26,400
Letters of Credit Outstanding, Amount	$ 33,300			33,300
Line of Credit Facility, Increase (Decrease), Net	25,000			395,000
Unamortized debt issuance costs	(33,232)			(33,232)		$ (38,071)
Total debt	3,611,120			3,611,120		3,472,653
Less: Current maturities of long-term debt	(68,806)			(68,806)		(337,337)
Total long-term debt	3,542,314			3,542,314		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				25,300
Term Loan	649,688			649,688		675,000
Bank Credit Facility	395,000			395,000
Letters of Credit Outstanding, Amount						0
Line of Credit Facility, Increase (Decrease), Net		$ 185,000	$ 10,000
Term Loan [Member]
Debt Instrument [Line Items]
Repayments of Debt				300
Line of Credit Facility, Increase (Decrease), Net					$ 120,000
Unsecured Debt
Debt Instrument [Line Items]
Unamortized pricing discounts and other	6,789			6,789		7,456
Unsecured Debt \| October 2018
Debt Instrument [Line Items]
Senior Notes	0			0		250,000
Unsecured Debt \| November 2020
Debt Instrument [Line Items]
Senior Notes	200,000			200,000		200,000
Unsecured Debt \| November 2021
Debt Instrument [Line Items]
Senior Notes	150,000			150,000		150,000
Unsecured Debt \| January 2022
Debt Instrument [Line Items]
Senior Notes	425,000			425,000		425,000
Unsecured Debt \| May 2024
Debt Instrument [Line Items]
Senior Notes	850,000			850,000		850,000
Unsecured Debt \| April 2027
Debt Instrument [Line Items]
Senior Notes	200,000			200,000		200,000
Unsecured Debt \| December 2027
Debt Instrument [Line Items]
Senior Notes	550,000			550,000		550,000
Capital Lease Obligations
Debt Instrument [Line Items]
Obligations under capital leases	212,126			212,126		197,232
Mortgages [Member]
Debt Instrument [Line Items]
Mortgage notes and other debt	$ 5,749			$ 5,749		$ 6,036