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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amount recognized in AOCL at beginning of year, pre-tax | $ 200,094 | $ 243,434 |
Recognized during the year: |  |  |
Amortization of actuarial losses | (16,664) | (21,465) | $ (15,644)
Ocurring during the year: |  |  |
Net actuarial (gains) / losses | (6,413) | (21,875) |
Total (decrease) increase in AOCL | (23,077) | (43,340) |
Accumulated other comprehensive loss at end of year | 177,017 | 200,094 | 243,434
OPEB Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amount recognized in AOCL at beginning of year, pre-tax | (25,454) | (26,486) |
Recognized during the year: |  |  |
Amortization of actuarial losses | 2,193 | 2,212 | 0
Ocurring during the year: |  |  |
Net actuarial (gains) / losses | (16,787) | (1,180) |
Total (decrease) increase in AOCL | (14,594) | 1,032 |
Accumulated other comprehensive loss at end of year | $ (40,048) | $ (25,454) | $ (26,486)

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