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Net Income Per Share (Tables)
6 Months Ended
Jun. 30, 2011
Earnings Per Share [Abstract]  
Summary of the net income allocated to common shares and the basic and diluted shares used in the net income per share computations

The following table summarizes the net income allocated to common shares and the basic and diluted shares used in the net income per share computations for the three month and six month periods ended June 30, 2011 and 2010:

   
Three Months Ended
June 30,
  
Six Months Ended
June 30,
 
   
2011
  
2010
  
2011
  
2010
 
              
Net income
 $6,741  $5,118  $15,527  $7,417 
Less income allocated to participating securities
  (199)  (51)  (463)  (214)
Net income allocated to common shares
 $6,542  $5,067  $15,064  $7,203 
                  
                  
Weighted average common shares outstanding
  25,726   25,381   25,608   25,231 
Incremental shares from assumed conversions of common stock options
   101    112    110    102 
Adjusted weighted average common shares outstanding
  25,827   25,493   25,718   25,333 
                  
Potentially dilutive securities not included in weighted average share calculation due to anti-dilutive effect
   8    460    4    568