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Fair Value of Assets and Liabilities (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Senior Notes, due 2014 at 7.875%
    
Fair Value of Assets and Liabilities    
Interest rate stated percentage 7.875% 7.875%
Senior Notes, due 2015 at 5.125%
    
Fair Value of Assets and Liabilities    
Interest rate stated percentage 5.125% 5.125%
Senior Notes, due 2016 at 6.3%
    
Fair Value of Assets and Liabilities    
Interest rate stated percentage 6.30% 6.30%
Senior Notes, due 2017 at 5.625%
    
Fair Value of Assets and Liabilities    
Interest rate stated percentage 5.625% 5.625%
Senior Notes, due 2018 at 6.7%
    
Fair Value of Assets and Liabilities    
Interest rate stated percentage 6.70% 6.70%
Senior Notes, due 2022 at 5%
    
Fair Value of Assets and Liabilities    
Interest rate stated percentage 5.00% 5.00%
Senior Notes, due 2023 at 4.5%
    
Fair Value of Assets and Liabilities    
Interest rate stated percentage 4.50%  
Convertible senior notes, due 2027 at 3.8%
    
Fair Value of Assets and Liabilities    
Interest rate stated percentage 3.80% 3.80%
Carrying Amount
    
Fair Value of Assets and Liabilities    
Financial liabilities $ 2,303,505 $ 2,002,358
Unamortized discounts (9,973) (11,120)
Carrying Amount | Senior Notes, due 2014 at 7.875%
    
Fair Value of Assets and Liabilities    
Financial liabilities 300,000 300,000
Carrying Amount | Senior Notes, due 2015 at 5.125%
    
Fair Value of Assets and Liabilities    
Financial liabilities 280,000 280,000
Carrying Amount | Senior Notes, due 2016 at 6.3%
    
Fair Value of Assets and Liabilities    
Financial liabilities 275,000 275,000
Carrying Amount | Senior Notes, due 2017 at 5.625%
    
Fair Value of Assets and Liabilities    
Financial liabilities 300,000 300,000
Carrying Amount | Senior Notes, due 2018 at 6.7%
    
Fair Value of Assets and Liabilities    
Financial liabilities 350,000 350,000
Carrying Amount | Senior Notes, due 2022 at 5%
    
Fair Value of Assets and Liabilities    
Financial liabilities 500,000 500,000
Carrying Amount | Senior Notes, due 2023 at 4.5%
    
Fair Value of Assets and Liabilities    
Financial liabilities 300,000  
Carrying Amount | Convertible senior notes, due 2027 at 3.8%
    
Fair Value of Assets and Liabilities    
Financial liabilities 8,478 8,478
Fair Value
    
Fair Value of Assets and Liabilities    
Financial liabilities 2,434,861 2,231,265
Fair Value | Senior Notes, due 2014 at 7.875%
    
Fair Value of Assets and Liabilities    
Financial liabilities 316,789 333,360
Fair Value | Senior Notes, due 2015 at 5.125%
    
Fair Value of Assets and Liabilities    
Financial liabilities 291,145 298,926
Fair Value | Senior Notes, due 2016 at 6.3%
    
Fair Value of Assets and Liabilities    
Financial liabilities 303,484 306,078
Fair Value | Senior Notes, due 2017 at 5.625%
    
Fair Value of Assets and Liabilities    
Financial liabilities 323,728 335,173
Fair Value | Senior Notes, due 2018 at 6.7%
    
Fair Value of Assets and Liabilities    
Financial liabilities 397,921 417,293
Fair Value | Senior Notes, due 2022 at 5%
    
Fair Value of Assets and Liabilities    
Financial liabilities 498,013 531,343
Fair Value | Senior Notes, due 2023 at 4.5%
    
Fair Value of Assets and Liabilities    
Financial liabilities 294,923  
Fair Value | Convertible senior notes, due 2027 at 3.8%
    
Fair Value of Assets and Liabilities    
Financial liabilities $ 8,858 $ 9,092