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Earnings per Share
6 Months Ended
Jun. 30, 2011
Earnings per Share
15. Earnings per Share

The following table sets forth basic and diluted weighted average shares outstanding for the periods indicated (in thousands):

   
Three Months Ended
   
Six Months Ended
 
   
June 30,
   
June 30,
 
   
2011
   
2010
   
2011
   
2010
 
                         
Weighted average shares - basic
    20,033       20,124       20,078       20,122  
Effect of dilutive securities
    7       132       14       52  
Weighted average shares - assuming dilution
    20,040       20,256       20,092       20,174  

For the three months and six months ended June 30, 2011, 939,166 shares of common stock potentially issuable upon the exercise of employee stock options were excluded from the weighted average number of shares outstanding on a diluted basis because the effect of such options would be anti-dilutive.  For the three months and six months ended June 30, 2010, 899,166 shares of common stock potentially issuable upon the exercise of employee stock options were excluded from the weighted average number of shares outstanding on a diluted basis because the effect of such options would be anti-dilutive.