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Indebtedness (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Jun. 30, 2011
Dec. 31, 2011
Senior Notes, due 2012 at 6.85%
Dec. 31, 2010
Senior Notes, due 2012 at 6.85%
Dec. 31, 2011
Senior Notes, due 2013 at 6.75%
Dec. 31, 2010
Senior Notes, due 2013 at 6.75%
Dec. 31, 2011
Senior Notes, due 2014 at 7.875%
Dec. 31, 2010
Senior Notes, due 2014 at 7.875%
Dec. 31, 2011
Senior Notes, due 2015 at 5.125%
Dec. 31, 2010
Senior Notes, due 2015 at 5.125%
Dec. 31, 2011
Senior Notes, due 2016 at 6.3%
Dec. 31, 2010
Senior Notes, due 2016 at 6.3%
Dec. 31, 2011
Senior Notes, due 2017 at 5.625%
Dec. 31, 2010
Senior Notes, due 2017 at 5.625%
Dec. 31, 2011
Senior Notes, due 2018 at 6.7%
Dec. 31, 2010
Senior Notes, due 2018 at 6.7%
Dec. 31, 2011
Convertible senior notes, due 2027 at 3.8%
Dec. 31, 2010
Convertible senior notes, due 2027 at 3.8%
Dec. 31, 2009
Convertible senior notes, due 2027 at 3.8%
Jan. 31, 2011
Mortgage note, due 2011 at 8.3%
Dec. 31, 2011
Mortgage note, due 2011 at 8.3%
Dec. 31, 2010
Mortgage note, due 2011 at 8.3%
Sep. 30, 2011
Unsecured revolving credit facility
Dec. 31, 2011
Unsecured revolving credit facility
Sep. 08, 2011
Unsecured revolving credit facility
Dec. 31, 2010
Unsecured revolving credit facility
Dec. 31, 2009
Unsecured revolving credit facility
Sep. 08, 2011
Prior unsecured revolving credit facility
Indebtedness                                                            
Interest rate stated percentage         6.85% 6.85% 6.75% 6.75% 7.875% 7.875% 5.125% 5.125% 6.30% 6.30% 5.625% 5.625% 6.70% 6.70% 3.80% 3.80%     8.30% 8.30%            
Carrying amount $ 2,120,883       $ 100,829 $ 100,829 $ 287,000 $ 287,000 $ 300,000 $ 300,000 $ 280,000 $ 280,000 $ 275,000 $ 275,000 $ 300,000 $ 300,000 $ 350,000 $ 350,000 $ 79,054 $ 79,054                    
Unamortized discounts (5,169) (8,043)   (5,169)                             231 1,570                    
Unsecured senior notes 1,966,714 1,963,840                                                        
Unsecured revolving credit facility 149,000 144,000                                               149,000   144,000    
Mortgage notes payable   3,383                                           3,383            
Total indebtedness 2,115,714 2,111,223                                                        
Principal balance of debt repaid                                           3,383                
Initial exchange price (In dollars per share)                                     $ 50.50                      
Estimated effective interest rate (as a percent)                                     6.06%                      
Net carrying amount 78,823 77,484                                 78,823 77,484                    
Non-cash amortization 6,305 7,123 11,046                               1,605 2,602 6,864                  
Noncash amortization (in dollars per share)                                     $ 0.01 $ 0.02 $ 0.06                  
Amount allocated as the equity component of the notes                                     37,710                      
New unsecured revolving credit facility                                                     750,000     750,000
Unsecured revolving credit facility, interest rate description                                                 LIBOR plus          
Margin over base rate, in basis points (as a percent)                                                 1.30%          
Unsecured revolving credit facility, available amount                                                   601,000        
Unsecured revolving credit facility, weighted average interest rate (as a percent)                                                   1.59%   0.90% 1.00%  
Required principal payments under outstanding debt                                                            
2012 100,829                                                          
2013 287,000                                                          
2014 300,000                                                          
2015 429,000                                                          
2016 275,000                                                          
Thereafter 729,054                                                          
Total principal payments $ 2,120,883       $ 100,829 $ 100,829 $ 287,000 $ 287,000 $ 300,000 $ 300,000 $ 280,000 $ 280,000 $ 275,000 $ 275,000 $ 300,000 $ 300,000 $ 350,000 $ 350,000 $ 79,054 $ 79,054