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Pensions (Tables)
9 Months Ended
Sep. 30, 2020
Pensions [Abstract]  
Components of Net Periodic Pension Cost
Components of Net Periodic Pension Cost

 
 
Three Months
Ended September 30
  
Nine Months
Ended September 30
 
 
 
2020
  
2019
  
2020
  
2019
 
             
Service cost
 
$
234
  
$
213
  
$
703
  
$
637
 
Interest cost
  
365
   
412
   
1,093
   
1,234
 
Expected return on plan assets
  
(800
)
  
(684
)
  
(2,399
)
  
(2,050
)
Amortization of actuarial loss
  
92
   
106
   
277
   
316
 
Amortization of prior service cost
  
(3
)
  
(4
)
  
(9
)
  
(10
)
Rate-regulated adjustment
  
687
   
532
   
2,060
   
1,598
 
Net periodic pension expense
 
$
575
  
$
575
  
$
1,725
  
$
1,725