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Pensions (Tables)
 6 Months Ended
Jun. 30, 2024
Pensions [Abstract]  
Components of Net Periodic Pension Cost
Components of Net Periodic Pension Cost

 
Three Months
Ended June 30
    
Six Months
Ended June 30
  
   
2024
    
2023
    
2024
    
2023
  
                         
Service cost
  
$
158
    
$
150
    
$
317
    
$
299
  
Interest cost
    
465
      
469
      
928
      
938
  
Expected return on plan assets
    
(792
)
    
(903
)
    
(1,583
)
    
(1,806
)
Amortization of prior service cost
    
(3
)
    
(3
)
    
(6
)
    
(6
)
Rate-regulated adjustment
    
(106
)
    
676
      
455
      
1,477
  
Net periodic pension cost
  
$
(278
)
  
$
389
    
$
111
    
$
902