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Pension (Tables)
9 Months Ended
Sep. 30, 2018
Pension And Profit Sharing Tables Abstract  
Components of Net Benefit Cost

   Three Months Ended
September 30,
  Nine Months Ended
September 30,
   2018  2017  2018  2017
             
Service cost  $7   $9   $25   $27 
                     
Interest cost  $10   $8   $30   $36 
Expected return on plan assets   (17)   (12)   (51)   (52)
Amortization of prior service costs   —      (4)   —      —   
Amortization of actuarial loss   21    29    65    81 
     Total non-service cost  $14   $21   $44   $65 
                     
Net periodic pension cost  $21   $30   $69   $92