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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
Components of basic and diluted earnings per share
                 
    2013     2012  
    (in thousands)  

Weighted average outstanding shares of common stock, basic

     15,474       15,312  

Dilutive effect of restricted stock units

     28       263  
   

 

 

    

 

 

  

Weighted average outstanding shares of common stock, diluted

     15,502       15,575