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Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2012
Earnings Per Share [Abstract]  
Components of basic and diluted earnings per share

The components of basic and diluted earnings per share were as follows:

 

                                 
    Three Months Ended
September 30
    Nine Months Ended
September 30
 
    2012     2011     2012     2011  

Numerator:

                               

Net income

  $ 8,076     $ 4,618     $ 25,554     $ 15,637  
   

 

 

   

 

 

   

 

 

   

 

 

 

Denominator:

                               

Weighted averages shares outstanding

    27,970       27,575       27,818       27,551  

Assumed exercise of stock options

    908       418       855       291  
   

 

 

   

 

 

   

 

 

   

 

 

 
      28,878       27,993       28,673       27,842