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Earnings per Share
 3 Months Ended
Mar. 31, 2013
Earnings per Share [Abstract]  
Earnings per Share
9. Earnings per Share

Earnings per basic and diluted weighted average common share outstanding were calculated as follows for the three months ended March 31, 2013 and 2012 (in thousands, except per share data):

 

                 
    Three Months Ended March 31,  
    2013     2012  

Net income

   $ 9,506     $ 4,734  
   

 

 

    

 

 

  

Basic weighted-average common shares outstanding

     9,437       9,369  

Effect of potentially dilutive common shares (1)

     47       43  
   

 

 

    

 

 

  

Diluted weighted-average common shares outstanding

   $ 9,484       9,412  
   

 

 

    

 

 

  

Earnings per common share:

                

Earnings per basic common share

   $ 1.01     $ 0.51  

Earnings per diluted common share

   $ 1.00     $ 0.50  

Antidilutive shares not included in diluted common share calculation

     10       34  

 

(1) Represents the effect of the assumed exercise of stock options and the vesting of restricted stock units and performance stock awards, based on the treasury stock method.