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Pensions
 3 Months Ended
Mar. 31, 2021
Pensions [Abstract]  
Pensions
10.  Pensions
 
Components of Net Periodic Pension Cost

 
 
Three Months
Ended March 31
 
 
 
2021
  
2020
 
       
Service cost
 
$
271
  
$
234
 
Interest cost
  
302
   
364
 
Expected return on plan assets
  
(913
)
  
(799
)
Amortization of actuarial loss
  
121
   
92
 
Amortization of prior service credit
  
(3
)
  
(3
)
Rate-regulated adjustment
  
797
   
687
 
Net periodic pension expense
 
$
575
  
$
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, 2020 that it expected to contribute $2,300 to its pension plans in 2021.  For the three months ended March 31, 2021, contributions of $575 have been made.  The Company expects to contribute the remaining $1,725 during the final three quarters of 2021.