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Pensions (Tables)
6 Months Ended
Jun. 30, 2019
Pensions [Abstract]  
Components of Net Periodic Pension Cost
Components of Net Periodic Pension Cost

 
 
Three Months
Ended June 30
  
Six Months
Ended June 30
 
 
 
2019
  
2018
  
2019
  
2018
 
 
            
Service cost
 
$
212
  
$
254
  
$
424
  
$
508
 
Interest cost
  
411
   
379
   
822
   
758
 
Expected return on plan assets
  
(683
)
  
(698
)
  
(1,366
)
  
(1,396
)
Amortization of actuarial loss
  
105
   
102
   
210
   
203
 
Amortization of prior service cost
  
(3
)
  
(4
)
  
(6
)
  
(7
)
Rate-regulated adjustment
  
533
   
542
   
1,066
   
1,084
 
Net periodic pension expense
 
$
575
  
$
575
  
$
1,150
  
$
1,150