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Pension and other post-employment benefits
 6 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
Pension and other post-employment benefits Pension and other post-employment benefits
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