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Pension (Tables)
9 Months Ended
Sep. 30, 2013
Pension Tables  
Components of Net Benefit Cost

   Three Months Ended September 30,  Nine Months Ended September 30,
   2013  2012  2013  2012
             
Components of net periodic benefit cost:                    
Interest cost  $5   $21   $48   $64 
Service cost   13    9    30    27 
Expected return on plan assets   2    (24)   (53)   (71)
Amortization of prior service costs   3    2    8    7 
Amortization of actuarial loss   29    34    106    102 
   $52   $43   $139   $128