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Debt (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Notes Payable to Bank, Noncurrent $ 377,500 $ 600,000
Bank credit facility due March 2016 235,000 30,000
Total debt 3,067,766 3,301,910
Less current maturities (109,266) (176,362)
Long-term Debt and Capital Lease Obligations, Current (109,907) (153,738)
Debt instrument, unamortized discount (premium), net, current portion 641 22,624
Total long-term debt 2,958,500 3,125,548
Unsecured Debt
   
Debt Instrument [Line Items]    
Unamortized pricing discounts and other (3,062) 42,084
Unsecured Debt | July 2014
   
Debt Instrument [Line Items]    
Convertible Debt 0 86,416
Unsecured Debt | April 2015
   
Debt Instrument [Line Items]    
Senior Notes 0 136,465
Unsecured Debt | April 2016
   
Debt Instrument [Line Items]    
Senior Notes 197,377 197,377
Unsecured Debt | July 2016
   
Debt Instrument [Line Items]    
Convertible Debt 134 45,119
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 | April 2019
   
Debt Instrument [Line Items]    
Senior Notes 0 200,000
Unsecured Debt | May 2019
   
Debt Instrument [Line Items]    
Senior Notes 0 250,000
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 0
Unsecured Debt | April 2027
   
Debt Instrument [Line Items]    
Senior Notes 200,000 200,000
Revolving Credit Facility
   
Debt Instrument [Line Items]    
Bank credit facility due March 2016 235,000 30,000
Capital Lease Obligations
   
Debt Instrument [Line Items]    
Obligations under capital leases 186,596 189,697
Mortgages
   
Debt Instrument [Line Items]    
Mortgage notes and other debt, maturities through 2047 $ 4,221 $ 4,752