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Debt (Details) - USD ($) $ in Thousands	9 Months Ended
Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Total debt	$ 3,141,459		$ 3,054,725
Less current maturities	(95,045)		(90,931)
Long-term Debt and Capital Lease Obligations, Current	(95,045)		(90,931)
Total long-term debt	3,046,414		2,963,794
Unsecured Debt
Debt Instrument [Line Items]
Repayments of Other Debt	342,500	$ 985,800
Unamortized pricing discounts and other	8,759		(2,905)
Unsecured Debt \| April 2016
Debt Instrument [Line Items]
Senior Notes	0		197,377
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		550,000
Unsecured Debt \| April 2027
Debt Instrument [Line Items]
Senior Notes	200,000		200,000
Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Notes Payable to Bank	325,000		370,000
Line of Credit [Member]
Debt Instrument [Line Items]
Bank credit facility due March 2016	225,000		235,000
Capital Lease Obligations
Debt Instrument [Line Items]
Obligations under capital leases	208,613		181,002
Mortgages [Member]
Debt Instrument [Line Items]
Mortgage notes and other debt, maturities through 2047	$ 4,087		$ 4,251