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Earnings Per Share
 3 Months Ended
Jun. 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 Six Months Ended
   June 30, June 30,
   2012 2011 2012 2011
Numerator for basic and diluted earnings            
 per share - net income (loss) attributable            
 to common stockholders $ 54,735 $ 69,847 $ 94,037 $ 93,219
              
Denominator for basic earnings per             
 share - weighted average shares   213,498   176,445   206,612   165,755
Effect of dilutive securities:            
 Employee stock options   261   178   242   184
 Non-vested restricted shares   299   249   290   232
 Convertible senior unsecured notes   1,080   616   1,093   287
Dilutive potential common shares   1,640   1,043   1,625   703
Denominator for diluted earnings per            
 share - adjusted weighted average shares   215,138   177,488   208,237   166,458
              
Basic earnings per share $ 0.26 $ 0.40 $ 0.46 $ 0.56
Diluted earnings per share $ 0.25 $ 0.39 $ 0.45 $ 0.56

The diluted earnings per share calculations exclude the dilutive effect of 354,000 and 287,000 stock options for the three months ended June 30, 2012 and 2011, respectively, and 366,000 and 287,000 for the six 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.