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Earnings Per Share
 9 Months Ended
Sep. 30, 2013
Earnings Per Share [Abstract]  
Earnings Per Share
9. Earnings Per Share

Basic earnings per share is calculated by dividing net income by the weighted average number of common shares outstanding during the period. Except where the result would be anti-dilutive, dilutive earnings per share is calculated by assuming the vesting of unvested restricted stock and the exercise of stock options, as well as their related income tax benefits.  The following table reconciles the numerator and the denominator used to calculate basic and diluted earnings per share:
 
   
Three months ended September 30,
  
Six months ended September 30,
 
   
2013
  
2012
  
2013
  
2012
 
Numerator- net income
 $47,093  $25,541  $126,021  $64,936 
Denominator- weighted average shares
                
Basic
  68,198,006   67,415,363   68,026,705   67,308,758 
Dilutive effect of stock compensation awards (1)
  1,689,019   1,751,138   1,600,510   1,672,212 
Diluted
  69,887,025   69,166,501   69,627,215   68,980,970 
Net income per share
                
Basic
 $0.69  $0.38  $1.85  $0.96 
Diluted
 $0.67  $0.37  $1.81  $0.94 

(1) Excludes approximately 8,000 and 18,000 stock options for the three and nine month periods ended September 30, 2013, respectively, as the impact of such awards was anti-dilutive. Excludes approximately 2,000 and 259,000 stock options for the three and nine month periods ended September 30, 2012, respectively, as the impact of such awards was anti-dilutive.