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Earnings Per Share
 12 Months Ended
Dec. 31, 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):

   Year Ended December 31,
   2012 2011 2010
Numerator for basic and diluted earnings         
 per share - net income attributable to         
 common stockholders $ 221,884 $ 157,108 $ 106,882
           
Denominator for basic earnings per          
 share: weighted-average shares   224,343   173,741   127,656
Effect of dilutive securities:         
 Employee stock options   231   176   125
 Non-vested restricted shares   312   246   420
 Convertible senior unsecured notes   1,067   238   7
Dilutive potential common shares   1,610   660   552
Denominator for diluted earnings per         
 share: adjusted-weighted average shares   225,953   174,401   128,208
           
Basic earnings per share $ 0.99 $ 0.90 $ 0.84
Diluted earnings per share $ 0.98 $ 0.90 $ 0.83

The diluted earnings per share calculations exclude the dilutive effect of 182,000, 0 and 280,000 stock options for the years ended December 31, 2012, 2011 and 2010, respectively, because the exercise prices were more than the average market price. The Series H Cumulative Convertible and Redeemable Preferred Stock issued in 2010 was excluded from the calculations for 2010 and 2011 as the effect of the conversions was anti-dilutive. The Series I Cumulative Convertible Perpetual Preferred Stock issued in 2011 was excluded from the calculations for 2011 and 2012 as the effect of the conversions was anti-dilutive.