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Debt (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Notes Payable to Bank, Noncurrent $ 592,500 $ 600,000
Line of Credit Facility, Amount Outstanding 140,000  
Total debt 3,239,630 3,301,910
Long-term Debt and Capital Lease Obligations, Current (104,284) (153,738)
Debt instrument, unamortized discount (premium), net, current portion (1,421) (22,624)
Less current maturities (105,705) (176,362)
Total long-term debt 3,133,925 3,125,548
Unsecured Debt [Member]
   
Debt Instrument [Line Items]    
Unamortized pricing discounts and other 5,839 42,084
Unsecured Debt [Member] | July 2014 [Member]
   
Debt Instrument [Line Items]    
Convertible Debt 95 85,256
Unsecured Debt [Member] | April 2015 [Member]
   
Debt Instrument [Line Items]    
Senior Notes 136,465 136,465
Unsecured Debt [Member] | April 2016 [Member]
   
Debt Instrument [Line Items]    
Senior Notes 197,377 197,377
Unsecured Debt [Member] | July 2016 [Member]
   
Debt Instrument [Line Items]    
Convertible Debt 154 46,279
Unsecured Debt [Member] | June 2017 [Member]
   
Debt Instrument [Line Items]    
Senior Notes 295,000 295,000
Unsecured Debt [Member] | October 2018 [Member]
   
Debt Instrument [Line Items]    
Senior Notes 250,000 250,000
Unsecured Debt [Member] | April 2019 [Member]
   
Debt Instrument [Line Items]    
Senior Notes 200,000 200,000
Unsecured Debt [Member] | May 2019 [Member]
   
Debt Instrument [Line Items]    
Senior Notes 250,000 250,000
Unsecured Debt [Member] | November 2020 [Member]
   
Debt Instrument [Line Items]    
Senior Notes 200,000 200,000
Unsecured Debt [Member] | November 2021 [Member]
   
Debt Instrument [Line Items]    
Senior Notes 150,000 150,000
Unsecured Debt [Member] | January 2022 [Member]
   
Debt Instrument [Line Items]    
Senior Notes 425,000 425,000
Unsecured Debt [Member] | April 2027 [Member]
   
Debt Instrument [Line Items]    
Senior Notes 200,000 200,000
Unsecured Debt [Member] | July 2018 [Member]
   
Debt Instrument [Line Items]    
Line of Credit Facility, Amount Outstanding 140,000 30,000
Capital Lease Obligations [Member]
   
Debt Instrument [Line Items]    
Obligations under capital leases 192,528 189,697
Mortgages [Member]
   
Debt Instrument [Line Items]    
Mortgage notes and other debt, maturities through 2047 $ 4,672 $ 4,752