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

 
Three Months
Ended June 30
   
Six Months
Ended June 30
 
   
2023
   
2022
   
2023
   
2022
 
                         
Service cost
 
$
150
   
$
256
   
$
299
   
$
512
 
Interest cost
   
469
     
334
     
938
     
668
 
Expected return on plan assets
   
(903
)
   
(1,054
)
   
(1,806
)
   
(2,109
)
Amortization of prior service cost
   
(3
)
   
(3
)
   
(6
)
   
(6
)
Rate-regulated adjustment
   
676
     
1,042
     
1,477
     
2,085
 
Net periodic pension expense
 
$
389
   
$
575
   
$
902
   
$
1,150