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Pensions (Tables)
3 Months Ended
Mar. 31, 2021
Pensions [Abstract]  
Components of Net Periodic Pension Cost
Components of Net Periodic Pension Cost

 
 
Three Months
Ended March 31
 
 
 
2021
  
2020
 
       
Service cost
 
$
271
  
$
234
 
Interest cost
  
302
   
364
 
Expected return on plan assets
  
(913
)
  
(799
)
Amortization of actuarial loss
  
121
   
92
 
Amortization of prior service credit
  
(3
)
  
(3
)
Rate-regulated adjustment
  
797
   
687
 
Net periodic pension expense
 
$
575
  
$
575