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Earnings Per Share
9 Months Ended
Sep. 30, 2017
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 EndedNine Months Ended
September 30,September 30,
2017201620172016
Numerator for basic and diluted earnings
per share - net income (loss) attributable
to common stockholders $74,043$334,910$575,118$679,353
Denominator for basic earnings per
share - weighted average shares 369,089358,932366,096356,911
Effect of dilutive securities:
Employee stock options 4012853119
Non-vested restricted shares 515526464414
Redeemable shares1,0961,6511,2811,308
Dilutive potential common shares 1,6512,3051,7981,841
Denominator for diluted earnings per
share - adjusted weighted average shares 370,740361,237367,894358,752
Basic earnings per share $0.20$0.93$1.57$1.90
Diluted earnings per share $0.20$0.93$1.56$1.89

The Series I Cumulative Convertible Perpetual Preferred Stock was not included in the calculations as the effect of conversions into common stock was anti-dilutive.