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Pensions
 6 Months Ended
Jun. 30, 2021
Pensions [Abstract]  
Pensions

10.  Pensions
 
Components of Net Periodic Pension Cost

 
  
Three Months
Ended June 30
    
Six Months
Ended June 30
  
 
  
2021
    
2020
    
2021
    
2020
  
                         
Service cost
  
$
272
    
$
235
    
$
543
    
$
469
  
Interest cost
    
302
      
364
      
604
      
728
  
Expected return on plan assets
    
(913
)
    
(800
)
    
(1,826
)
    
(1,599
)
Amortization of actuarial loss
    
121
      
93
      
242
      
185
  
Amortization of prior service cost
    
(3
)
    
(3
)
    
(6
)
    
(6
)
Rate-regulated adjustment
    
796
      
686
      
1,593
      
1,373
  
Net periodic pension expense
  
$
575
    
$
575
    
$
1,150
    
$
1,150
  

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 six months ended June 30, 2021, contributions of $1,150 have been made.  The Company expects to contribute the remaining $1,150 during the final two quarters of 2021.