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Weighted Average Shares (Tables)
12 Months Ended
Dec. 31, 2012
Calculation of Weighted Average Shares

Weighted-average shares were calculated as follows (in thousands):

 

     Year Ended December 31,  
     2012      2011      2010  

Basic weighted-average common shares outstanding

     42,833         41,859         39,924   

Effect of dilutive stock options

     807         903         373   
  

 

 

    

 

 

    

 

 

 

Diluted weighted-average common and common-equivalent shares outstanding

     43,640         42,762         40,297