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Pension and other post-employment benefits (Tables)
 6 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
Schedule of Components of Net Benefit Costs For Pension Plans and OPEB Recorded as Part of Administrative Expenses
The following tables list the components of net benefit costs for the pension plans and other post-employment benefits ("OPEB") in the unaudited interim condensed consolidated statements of operations for the three and six months ended June 30:
 Pension benefits
Three months ended June 30Six months ended June 30
 2024202320242023
Service cost$2,969 $3,166 $6,053 $6,093 
Non-service costs
Interest cost8,061 7,906 16,494 16,299 
Expected return on plan assets(8,603)(7,947)(17,300)(16,263)
Amortization of net actuarial gains
(321)(71)(712)(195)
Amortization of prior service credits(359)(373)(719)(746)
Impact of regulatory accounts4,384 4,588 8,755 8,683 
$3,162 $4,103 $6,518 $7,778 
Net benefit cost$6,131 $7,269 $12,571 $13,871 

 OPEB
Three months ended June 30Six months ended June 30
 2024202320242023
Service cost$780 $902 $1,560 $1,891 
Non-service costs
Interest cost2,674 2,891 5,327 6,329 
Expected return on plan assets(2,644)(2,331)(5,288)(5,077)
Amortization of net actuarial gains
(867)(561)(2,466)(1,122)
Amortization of prior service credits(213)(213)(426)(426)
Impact of regulatory accounts1,863 1,417 3,748 2,785 
$813 $1,203 $895 $2,489 
Net benefit cost$1,593 $2,105 $2,455 $4,380