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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive loss at beginning of year | $ 225,356 | $ 265,899 |
Recognized during the year: |  |  |
Amortization of actuarial losses | (15,644) | (18,876) | $ (20,880)
Ocurring during the year: |  |  |
Net actuarial (gains) / losses | 33,722 | (21,667) |
Total (decrease) increase in AOCL | 18,078 | (40,543) |
Accumulated other comprehensive loss at end of year | 243,434 | 225,356 | 265,899
OPEB Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated other comprehensive loss at beginning of year | 12,993 | 32,152 |
Recognized during the year: |  |  |
Amortization of actuarial losses | 0 | (1,873) | (567)
Ocurring during the year: |  |  |
Net actuarial (gains) / losses | (39,479) | (17,286) |
Total (decrease) increase in AOCL | (39,479) | (19,159) |
Accumulated other comprehensive loss at end of year | $ (26,486) | $ 12,993 | $ 32,152

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 + Details
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