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Pension (Tables)
6 Months Ended
Jun. 30, 2017
Pension Tables  
Components of Net Benefit Cost

   Three Months Ended June 30,  Six Months Ended June 30,
   2017  2016  2017  2016
             
Components of Net Periodic Benefit Cost:         
Interest cost  $14   $14   $28   $28 
Service cost   9    9    18    18 
Expected return on plan assets   (20)   (19)   (40)   (38)
Amortization of prior service costs   2    —      4    —   
Amortization of actuarial loss   26    31    52    62 
   $31   $35   $62   $70