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Earnings Per Share
 3 Months Ended
Sep. 30, 2012
Earnings Per Share [Abstract]  
Earnings Per Share

15. Earnings Per Share

     The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share data):

   Three Months Ended Nine Months Ended
   September 30, September 30,
   2012 2011 2012 2011
Numerator for basic and diluted earnings            
 per share - net income (loss) attributable            
 to common stockholders $ 37,269 $ 36,607 $ 131,308 $ 129,826
              
Denominator for basic earnings per             
 share - weighted average shares   224,391   177,272   212,592   169,636
Effect of dilutive securities:            
 Employee stock options   238   172   240   180
 Non-vested restricted shares   301   258   293   241
 Convertible senior unsecured notes   1,328   147   950   244
Dilutive potential common shares   1,867   577   1,483   665
Denominator for diluted earnings per            
 share - adjusted weighted average shares   226,258   177,849   214,075   170,301
              
Basic earnings per share $ 0.17 $ 0.21 $ 0.62 $ 0.77
Diluted earnings per share $ 0.16 $ 0.21 $ 0.61 $ 0.76

The diluted earnings per share calculations exclude the dilutive effect of 237,000 and 227,000 stock options for the three months ended September 30, 2012 and 2011, respectively, and 0 and 381,000 for the nine months ended because the exercise prices were more than the average market price. The Series H Cumulative Convertible and Redeemable Preferred Stock and Series I Cumulative Convertible Perpetual Preferred Stock were not included in the calculations as the effect of conversions into common stock was anti-dilutive.