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Earnings Per Share (Tables)
6 Months Ended
Jun. 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
June 30
    Six Months Ended
June 30
 
    2012     2011     2012     2011  

Numerator:

                               

Net income

  $ 8,744     $ 6,007     $ 17,478     $ 11,019  
   

 

 

   

 

 

   

 

 

   

 

 

 
         

Denominator:

                               

Weighted averages shares outstanding

    27,858       27,548       27,740       27,538  

Assumed exercise of stock options

    879       290       804       275  
   

 

 

   

 

 

   

 

 

   

 

 

 
      28,737       27,838       28,544       27,813