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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2015
Earnings Per Share (Tables) [Abstract]  
Computation of basic and diluted earnings per share
Three Months EndedSix Months Ended
June 30,June 30,
2015201420152014
Numerator for basic and diluted earnings
per share - net income (loss) attributable
to common stockholders $312,573$71,829$503,373$121,851
Denominator for basic earnings per
share - weighted average shares 350,399296,256343,624293,046
Effect of dilutive securities:
Employee stock options 153191176170
Non-vested restricted shares 471472444506
Convertible senior unsecured notes 3431,076379868
Dilutive potential common shares 9671,7399991,544
Denominator for diluted earnings per
share - adjusted weighted average shares 351,366297,995344,623294,590
Basic earnings per share $0.89$0.24$1.46$0.42
Diluted earnings per share $0.89$0.24$1.46$0.41