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Pensions
 9 Months Ended
Sep. 30, 2020
Pensions [Abstract]  
Pensions
12.  Pensions
 
Components of Net Periodic Pension Cost

 
 
Three Months
Ended September 30
  
Nine Months
Ended September 30
 
 
 
2020
  
2019
  
2020
  
2019
 
             
Service cost
 
$
234
  
$
213
  
$
703
  
$
637
 
Interest cost
  
365
   
412
   
1,093
   
1,234
 
Expected return on plan assets
  
(800
)
  
(684
)
  
(2,399
)
  
(2,050
)
Amortization of actuarial loss
  
92
   
106
   
277
   
316
 
Amortization of prior service cost
  
(3
)
  
(4
)
  
(9
)
  
(10
)
Rate-regulated adjustment
  
687
   
532
   
2,060
   
1,598
 
Net periodic pension expense
 
$
575
  
$
575
  
$
1,725
  
$
1,725
 

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, 2019 that it expected to contribute $2,300 to its pension plans in 2020.  For the nine months ended September 30, 2020, contributions of $1,725 have been made.  The Company expects to contribute the remaining $575 during the final quarter of 2020.