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Fair Value of Assets and Liabilities (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2011
Dec. 31, 2010
Convertible senior notes, due 2027 at 3.8% | Carrying Amount
   
Fair Value of Assets and Liabilities    
Financial liabilities $ 79,054 $ 79,054
Mortgage note, due 2011 at 8.3% | Carrying Amount
   
Fair Value of Assets and Liabilities    
Financial liabilities   3,383
Carrying Amount
   
Fair Value of Assets and Liabilities    
Unamortized discounts (6,616) (8,043)
Total financial liabilities 1,965,267 1,967,223
Carrying Amount | Senior Notes, due 2012 at 6.85%
   
Fair Value of Assets and Liabilities    
Financial liabilities 100,829 100,829
Carrying Amount | Senior Notes, due 2013 at 6.75%
   
Fair Value of Assets and Liabilities    
Financial liabilities 287,000 287,000
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
Convertible senior notes, due 2027 at 3.8% | Fair Value
   
Fair Value of Assets and Liabilities    
Financial liabilities 81,170 81,579
Mortgage note, due 2011 at 8.3% | Fair Value
   
Fair Value of Assets and Liabilities    
Financial liabilities   3,408
Fair Value
   
Fair Value of Assets and Liabilities    
Total financial liabilities 2,200,895 2,163,948
Fair Value | Senior Notes, due 2012 at 6.85%
   
Fair Value of Assets and Liabilities    
Financial liabilities 108,697 109,897
Fair Value | Senior Notes, due 2013 at 6.75%
   
Fair Value of Assets and Liabilities    
Financial liabilities 313,793 315,364
Fair Value | Senior Notes, due 2014 at 7.875%
   
Fair Value of Assets and Liabilities    
Financial liabilities 352,602 349,974
Fair Value | Senior Notes, due 2015 at 5.125%
   
Fair Value of Assets and Liabilities    
Financial liabilities 303,769 296,782
Fair Value | Senior Notes, due 2016 at 6.3%
   
Fair Value of Assets and Liabilities    
Financial liabilities 306,393 297,795
Fair Value | Senior Notes, due 2017 at 5.625%
   
Fair Value of Assets and Liabilities    
Financial liabilities 328,224 316,846
Fair Value | Senior Notes, due 2018 at 6.7%
   
Fair Value of Assets and Liabilities    
Financial liabilities 406,247 392,303
Mortgage note, due 2011 at 8.3%
   
Fair Value of Assets and Liabilities    
Interest rate stated percentage (as a percent)   8.30%
Senior Notes, due 2012 at 6.85%
   
Fair Value of Assets and Liabilities    
Interest rate stated percentage (as a percent) 6.85% 6.85%
Senior Notes, due 2013 at 6.75%
   
Fair Value of Assets and Liabilities    
Interest rate stated percentage (as a percent) 6.75% 6.75%
Senior Notes, due 2014 at 7.875%
   
Fair Value of Assets and Liabilities    
Interest rate stated percentage (as a percent) 7.875% 7.875%
Senior Notes, due 2015 at 5.125%
   
Fair Value of Assets and Liabilities    
Interest rate stated percentage (as a percent) 5.125% 5.125%
Senior Notes, due 2016 at 6.3%
   
Fair Value of Assets and Liabilities    
Interest rate stated percentage (as a percent) 6.30% 6.30%
Senior Notes, due 2017 at 5.625%
   
Fair Value of Assets and Liabilities    
Interest rate stated percentage (as a percent) 5.625% 5.625%
Senior Notes, due 2018 at 6.7%
   
Fair Value of Assets and Liabilities    
Interest rate stated percentage (as a percent) 6.70% 6.70%
Convertible senior notes, due 2027 at 3.8%
   
Fair Value of Assets and Liabilities    
Unamortized discounts (911) (1,570)
Total financial liabilities $ 78,143 $ 77,484
Interest rate stated percentage (as a percent) 3.80% 3.80%