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Earning Per Share (Tables)
 12 Months Ended
Dec. 31, 2012
Earnings Per Share [Abstract]  
Components of basic and diluted earnings per share
                         
    2012     2011     2010  
    (in thousands)  

Weighted average outstanding shares of common stock, basic

     15,418       15,312       15,312  

Dilutive effect of restricted stock units

     70       185       25  
   

 

 

    

 

 

    

 

 

  

Weighted average outstanding shares of common stock, diluted

     15,488       15,497       15,337