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Pension (Tables)
3 Months Ended
Mar. 31, 2018
Pension Tables  
Components of Net Benefit Cost

   Three Months Ended March 31,
   2018  2017
           
Service cost  $9   $9 
           
Interest cost  $10   $14 
Expected return on plan assets   (17)   (20)
Amortization of prior service costs   —      2 
Amortization of actuarial loss   22    26 
     Total non-service cost  $15   $22 
           
Net periodic pension cost  $24   $31