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Defined Benefit Pension Plan (Tables)
3 Months Ended
Mar. 31, 2013
Defined Benefit Pension Plan [Abstract]  
Components of net periodic benefit cost
                 
    Three Months Ended
March 31,
 
    2013     2012  

Service cost

  $ 29     $ 21  

Interest cost

    39       45  
   

 

 

   

 

 

 

Net periodic benefit cost

  $ 68     $ 66