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Debt (Details) - USD ($) $ in Thousands	3 Months Ended
Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Debt Instrument [Line Items]
Repayments of Other Debt	$ 100
Letters of Credit Outstanding, Amount	30,800
Bank Credit Facility	0		$ 270,000
Unamortized debt issuance costs	(37,767)		(42,491)
Total debt	3,133,755		3,124,428
Less: Current maturities of long-term debt	(57,413)		(86,823)
Total long-term debt	3,076,342		3,037,605
July 2018
Debt Instrument [Line Items]
Repayments of Other Debt		$ 15,000
Line of Credit Facility, Increase (Decrease), Net	10,000	$ 15,000
March 2021
Debt Instrument [Line Items]
Term Loan	550,000		0
Letters of Credit Outstanding, Amount	30,000
Bank Credit Facility	30,000		0
Unsecured Debt
Debt Instrument [Line Items]
Unamortized pricing discounts and other	8,512		8,636
Unsecured Debt \| June 2017
Debt Instrument [Line Items]
Senior Notes	295,000		295,000
Unsecured Debt \| October 2018
Debt Instrument [Line Items]
Senior Notes	250,000		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
Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Term Loan	0		310,000
Line of Credit [Member]
Debt Instrument [Line Items]
Bank Credit Facility	0		270,000
Capital Lease Obligations
Debt Instrument [Line Items]
Obligations under capital leases	209,027		204,246
Mortgages [Member]
Debt Instrument [Line Items]
Mortgage notes and other debt	$ 3,983		$ 4,037