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Pensions (Tables)
 9 Months Ended
Sep. 30, 2017
Pensions [Abstract]  
Components of Net Periodic Pension Cost
Components of Net Periodic Pension Cost

 
 
Three Months
Ended September 30
  
Nine Months
Ended September 30
 
 
 
2017
  
2016
  
2017
  
2016
 
 
            
Service cost
 
$
270
  
$
254
  
$
810
  
$
763
 
Interest cost
  
398
   
399
   
1,194
   
1,199
 
Expected return on plan assets
  
(599
)
  
(558
)
  
(1,796
)
  
(1,675
)
Amortization of actuarial loss
  
123
   
141
   
369
   
421
 
Amortization of prior service cost
  
(3
)
  
(3
)
  
(9
)
  
(9
)
Rate-regulated adjustment
  
386
   
342
   
1,157
   
1,026
 
Net periodic pension expense
 
$
575
  
$
575
  
$
1,725
  
$
1,725