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Earnings Per Share
 12 Months Ended
Dec. 31, 2011
Earnings Per Share [Abstract]  
Earnings Per Share
7. Earnings Per Share

The following table sets forth the computation of diluted weighted average common and potential common shares outstanding for the years ended December 31, 2011, 2010 and 2009, respectively (in thousands).

 

     Year Ended December 31,  
     2011      2010      2009  

Basic weighted average common shares outstanding

      32,043         31,494         30,648   

Effect of dilutive securities:

         

Options

      —           —           159   

Employee Stock Purchase Plan

      —           —           238   

Unvested Restricted Stock (including Restricted Stock Units)

      —           —           179   
  

 

 

     

 

 

     

 

 

  

Diluted weighted average common and potential common shares outstanding

      32,043         31,494         31,224   
  

 

 

     

 

 

     

 

 

  

Weighted average options, restricted stock units and ESPP shares to purchase a total of 4,656,929 shares, 3,675,163 shares and 3,149,937 shares of common stock for the years ended December 31, 2011, 2010 and 2009, respectively, were outstanding but not included in the computation of diluted earnings per share as their effect was anti-dilutive.