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Pensions
 3 Months Ended
Mar. 31, 2023
Pensions [Abstract]  
Pensions

10.  Pensions
 
Components of Net Periodic Pension Cost

 
  
Three Months
Ended March 31
  
 
  
2023
    
2022
  
             
Service cost
  
$
149
    
$
256
  
Interest cost
    
469
      
334
  
Expected return on plan assets
    
(903
)
    
(1,055
)
Amortization of prior service cost
    
(3
)
    
(3
)
Rate-regulated adjustment
    
801
      
1,043
  
Net periodic pension expense
  
$
513
    
$
575
  

Pension service cost is recorded in operating expenses.  All other components of net periodic pension cost are recorded as other pension costs in other income (expenses).

Employer Contributions
 
The Company previously disclosed in its financial statements for the year ended December 31, 2022 that it expected to contribute $1,680 to its pension plans in 2023.  For the three months ended March 31, 2023, contributions of $513 have been made.  The Company expects to contribute the remaining $1,167 during the final three quarters of 2023.