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Pensions (Tables)
9 Months Ended
Sep. 30, 2023
Pensions [Abstract]  
Components of Net Periodic Pension Cost
Components of Net Periodic Pension Cost

 
Three Months
Ended September 30
   
Nine Months
Ended September 30
 
   
2023
   
2022
   
2023
   
2022
 
                         
Service cost
 
$
150
   
$
257
   
$
449
   
$
769
 
Interest cost
   
469
     
334
     
1,407
     
1,002
 
Expected return on plan assets
   
(903
)
   
(1,054
)
   
(2,709
)
   
(3,163
)
Amortization of prior service cost
   
(4
)
   
(4
)
   
(10
)
   
(10
)
Rate-regulated adjustment
   
677
     
1,042
     
2,154
     
3,127
 
Net periodic pension expense
 
$
389
   
$
575
   
$
1,291
   
$
1,725