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Pensions (Tables)
6 Months Ended
Jun. 30, 2021
Pensions [Abstract]  
Components of Net Periodic Pension Cost
Components of Net Periodic Pension Cost

 
 
Three Months
Ended June 30
   
Six Months
Ended June 30
 
 
 
2021
   
2020
   
2021
   
2020
 
                         
Service cost
 
$
272
   
$
235
   
$
543
   
$
469
 
Interest cost
   
302
     
364
     
604
     
728
 
Expected return on plan assets
   
(913
)
   
(800
)
   
(1,826
)
   
(1,599
)
Amortization of actuarial loss
   
121
     
93
     
242
     
185
 
Amortization of prior service cost
   
(3
)
   
(3
)
   
(6
)
   
(6
)
Rate-regulated adjustment
   
796
     
686
     
1,593
     
1,373
 
Net periodic pension expense
 
$
575
   
$
575
   
$
1,150
   
$
1,150