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Pension and other post-employment benefits (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Non-service costs |  |  |  |
Non-service costs | $ 3,975 | $ 5,306 | $ 7,413 | $ 10,267
Pension benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 2,969 | 3,166 | 6,053 | 6,093
Non-service costs |  |  |  |
Interest cost | 8,061 | 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 accounts | 4,384 | 4,588 | 8,755 | 8,683
Non-service costs | 3,162 | 4,103 | 6,518 | 7,778
Net benefit cost | 6,131 | 7,269 | 12,571 | 13,871
OPEB |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 780 | 902 | 1,560 | 1,891
Non-service costs |  |  |  |
Interest cost | 2,674 | 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 accounts | 1,863 | 1,417 | 3,748 | 2,785
Non-service costs | 813 | 1,203 | 895 | 2,489
Net benefit cost | $ 1,593 | $ 2,105 | $ 2,455 | $ 4,380

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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