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Employee benefits - Change in accumulated other comprehensive income loss (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amount recognized in AOCL at beginning of year | $ 243,434 | $ 225,356 |
Recognized during the year: |  |  |
Amortization of actuarial losses | (21,465) | (15,644) | $ (18,876)
Ocurring during the year: |  |  |
Net actuarial (gains) / losses | (21,875) | 33,722 |
Total (decrease) increase in AOCL | (43,340) | 18,078 |
Accumulated other comprehensive loss at end of year | 200,094 | 243,434 | 225,356
OPEB Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amount recognized in AOCL at beginning of year | (26,486) | 12,993 |
Recognized during the year: |  |  |
Amortization of actuarial losses | 2,212 | 0 | (1,873)
Ocurring during the year: |  |  |
Net actuarial (gains) / losses | (1,180) | (39,479) |
Total (decrease) increase in AOCL | 1,032 | (39,479) |
Accumulated other comprehensive loss at end of year | $ (25,454) | $ (26,486) | $ 12,993

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- Definition Amount of gain (loss), recognized immediately as component of net periodic benefit (cost) credit, for change in value of benefit obligation or plan assets from experience different from that assumed, change in actuarial assumption, or consequence of temporarily deviating from substantive plan. Includes, but is not limited to, amount in excess of 10 percent of greater of fair value of plan assets or benefit obligation. + References Reference 1: 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 2: 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 3: 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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