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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2013
Earnings Per Share [Abstract]  
Computation of basic and diluted net income per share
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.