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

 
Three Months
Ended September 30
    
Nine Months
Ended September 30
  
   
2024
    
2023
    
2024
    
2023
  
                         
Service cost
  
$
159
    
$
150
    
$
476
    
$
449
  
Interest cost
    
464
      
469
      
1,392
      
1,407
  
Expected return on plan assets
    
(791
)
    
(903
)
    
(2,374
)
    
(2,709
)
Amortization of prior service cost
    
(4
)
    
(4
)
    
(10
)
    
(10
)
Rate-regulated adjustment
    
172
   
677
      
627
      
2,154
  
Net periodic pension cost
  
$
–
 
$
389
    
$
111
    
$
1,291