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Debt (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
Debt (Details) - USD ($) $ in Thousands	Apr. 23, 2019	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Debt Instrument [Line Items]
Repayments of Debt		$ 143,500	$ 268,100
Bank Credit Facility		275,000		$ 387,061
Letters of Credit Outstanding, Amount		32,900
Unamortized debt issuance costs		(30,275)		(31,762)
Total debt		3,477,750		3,602,078
Less: Current maturities of long-term debt		(68,554)		(69,896)
Total long-term debt		3,409,196		3,532,182
October 2018
Debt Instrument [Line Items]
Line of Credit Facility, Increase (Decrease), Net			175,000
December 2022
Debt Instrument [Line Items]
Term Loan		632,813		641,250
Bank Credit Facility		275,000
Letters of Credit Outstanding, Amount				395,000
Term Loan [Member]
Debt Instrument [Line Items]
Repayments of Debt		8,400
Line of Credit Facility, Increase (Decrease), Net			$ 10,000
Unsecured Debt
Debt Instrument [Line Items]
Unamortized pricing discounts and other		6,334		6,562
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		193,958		211,952
Mortgages [Member]
Debt Instrument [Line Items]
Mortgage notes and other debt		$ 24,920		$ 4,076
Subsequent Event [Member]
Debt Instrument [Line Items]
Bank Credit Facility	$ 315,000
Line of Credit Facility, Increase (Decrease), Net	$ 40,000