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Pension (Tables)
3 Months Ended
Mar. 31, 2017
Pension Tables  
Components of Net Benefit Cost

   Three Months Ended March 31,
   2017  2016
       
Components of net periodic benefit cost:          
Interest cost  $14   $14 
Service cost   9    9 
Expected return on plan assets   (20)   (19)
Amortization of prior service costs   2    —   
Amortization of actuarial loss   26    31 
   $31   $35