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Debt (Details) - USD ($) $ in Thousands	6 Months Ended
Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2014	Jun. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Total debt		$ 3,059,877	$ 3,054,725
Less current maturities		(290,016)	(90,931)
Long-term Debt and Capital Lease Obligations, Current		(290,016)	(90,931)
Total long-term debt		2,769,861	2,963,794
Unsecured Debt
Debt Instrument [Line Items]
Repayments of Other Debt	$ 898,200
Unamortized pricing discounts and other		(2,593)	(2,905)
Unsecured Debt \| April 2016
Debt Instrument [Line Items]
Senior Notes		197,377	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		550,000	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		340,000	370,000
Line of Credit [Member]
Debt Instrument [Line Items]
Bank credit facility due March 2016		265,000	235,000
Capital Lease Obligations
Debt Instrument [Line Items]
Obligations under capital leases		185,956	181,002
Mortgages [Member]
Debt Instrument [Line Items]
Mortgage notes and other debt, maturities through 2047		$ 4,137	$ 4,251