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Fair Value Measurements (Details 2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Fair Value of Financial Instruments    
Carrying Value $ 4,449,381 $ 4,448,888
Fair Value 4,975,589 5,142,918
Carrying Value 69,188 69,188
Fair Value 68,625 68,625
Securities available-for-sale 125,592 200,577
Trading equity securities, fair value   52,705
6.15% senior notes due February 2018
   
Fair Value of Financial Instruments    
Carrying Value 969,012 968,708
Fair Value 1,114,620 1,164,813
Interest rate on senior note due (as a percent) 6.15%  
9.25% senior notes due January 2019
   
Fair Value of Financial Instruments    
Carrying Value 1,125,000 1,125,000
Fair Value 1,451,846 1,492,819
Interest rate on senior note due (as a percent) 9.25%  
5.00% senior notes due September 2020
   
Fair Value of Financial Instruments    
Carrying Value 697,724 697,648
Fair Value 744,198 770,707
Interest rate on senior note due (as a percent) 5.00%  
4.625% senior notes due September 2021
   
Fair Value of Financial Instruments    
Carrying Value 697,967 697,907
Fair Value 705,810 755,517
Interest rate on senior note due (as a percent) 4.625%  
Revolving Credit Facility
   
Fair Value of Financial Instruments    
Carrying Value 890,000 890,000
Fair Value 890,000 890,000
Other
   
Fair Value of Financial Instruments    
Carrying Value 490 437
Fair Value $ 490 $ 437