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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,
201220112010
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.