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Share-based Compensation (Tables)
3 Months Ended
Mar. 31, 2013
Share-based Compensation [Abstract]  
Share-based compensation expense
                 
        Three months ended      
    March 31,  
    2013     2012  
    (in thousands)  

Stock option awards

  $ 168     $ 140  

Restricted stock units

    109       123  
   

 

 

   

 

 

 
     

Total share-based compensation

  $ 277     $ 263