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Pension and other post-employment benefits
 6 Months Ended
Jun. 30, 2023
Retirement Benefits [Abstract]  
Pension and other post-employment benefits Pension and other post-employment benefits
The following table lists the components of net benefit costs for the pension plans and other post-employment benefits (“OPEB”) in the unaudited interim consolidated statements of operations for the three and six months ended June 30:
 Pension benefits
Three months ended June 30Six months ended June 30
 2023202220232022
Service cost$3,166 $4,532 $6,093 $8,388 
Non-service costs
Interest cost7,906 6,778 16,299 12,841 
Expected return on plan assets(7,947)(10,519)(16,263)(20,843)
Amortization of net actuarial losses (gains)(71)1,257 (195)2,046 
Amortization of prior service credits(373)(389)(746)(792)
Impact of regulatory accounts4,588 4,664 8,683 11,002 
$4,103 $1,791 $7,778 $4,254 
Net benefit cost$7,269 $6,323 $13,871 $12,642 

 OPEB
Three months ended June 30Six months ended June 30
 2023202220232022
Service cost$902 $1,554 $1,891 $3,109 
Non-service costs
Interest cost2,891 2,282 6,329 4,641 
Expected return on plan assets(2,331)(2,841)(5,077)(5,682)
Amortization of net actuarial gains(561)(86)(1,122)(172)
Amortization of prior service credits(213)6 (426)12 
Impact of regulatory accounts1,417 1,106 2,785 1,783 
$1,203 $467 $2,489 $582 
Net benefit cost$2,105 $2,021 $4,380 $3,691