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Pensions (Tables)
 3 Months Ended
Mar. 31, 2017
Pensions [Abstract]  
Components of Net Periodic Pension Cost
Components of Net Periodic Pension Cost

 
 
Three Months
Ended March 31
 
 
 
2017
  
2016
 
 
      
Service cost
 
$
270
  
$
254
 
Interest cost
  
398
   
400
 
Expected return on plan assets
  
(599
)
  
(558
)
Amortization of actuarial loss
  
123
   
140
 
Amortization of prior service credit
  
(3
)
  
(3
)
Rate-regulated adjustment
  
386
   
342
 
Net periodic pension expense
 
$
575
  
$
575