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Earnings Per Share
 6 Months Ended
Jun. 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 June 30,
  
Six months ended June 30,
 
   
2013
  
2012
  
2013
  
2012
 
              
Numerator- net income
 $28,254  $9,335  $78,928  $39,395 
Denominator- weighted average shares
                
Basic
  68,140,330   67,309,260   68,003,164   67,254,870 
Dilutive effect of stock compensation awards (1)
  1,669,269   1,336,273   1,798,333   1,344,997 
Diluted
  69,809,599   68,645,533   69,801,498   68,599,867 
Net income per share
                
Basic
 $0.41  $0.14  $1.16  $0.59 
Diluted
 $0.40  $0.14  $1.13  $0.57 

(1) Excludes approximately 300,000 and 250,000 stock options for the three and six month periods ended June 30, 2013, respectively, as the impact of such awards was anti-dilutive. Excludes approximately 360,000 stock options for the three and six month periods ended June 30, 2012 as the impact of such awards was anti-dilutive.