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Pensions (Tables)
6 Months Ended
Jun. 30, 2022
Pensions [Abstract]  
Components of Net Periodic Pension Cost
Components of Net Periodic Pension Cost

 
Three Months
Ended June 30
   
Six Months
Ended June 30
 
   
2022
   
2021
   
2022
   
2021
 
                         
Service cost
 
$
256
   
$
272
   
$
512
   
$
543
 
Interest cost
   
334
     
302
     
668
     
604
 
Expected return on plan assets
   
(1,054
)
   
(913
)
   
(2,109
)
   
(1,826
)
Amortization of actuarial loss
   
     
121
     
     
242
 
Amortization of prior service cost
   
(3
)
   
(3
)
   
(6
)
   
(6
)
Rate-regulated adjustment
   
1,042
     
796
     
2,085
     
1,593
 
Net periodic pension expense
 
$
575
   
$
575
   
$
1,150
   
$
1,150