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Employee benefits - Reconciliation of net (liabilities) assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Pension Plans |  |  |
Reconciliation of net (liabilities) assets: |  |  |
Net assets/(liabilities) at beginning of year | $ 16,632 | $ (8,290) |
Amount recognized in AOCL at beginning of year, pre-tax | 200,094 | 243,434 |
Amount prepaid (liability) at beginning of year | 216,726 | 235,144 |
Total benefit cost | (12,522) | (18,648) | $ 545
Contributions | 230 | 230 |
Amount prepaid (liability) at end of year | 204,434 | 216,726 | 235,144
Amount recognized in AOCL | (177,017) | (200,094) | (243,434)
Net assets/(liabilities) at end of year | 27,417 | 16,632 | (8,290)
OPEB Plan |  |  |
Reconciliation of net (liabilities) assets: |  |  |
Net assets/(liabilities) at beginning of year | (117,045) | (118,336) |
Amount recognized in AOCL at beginning of year, pre-tax | (25,454) | (26,486) |
Amount prepaid (liability) at beginning of year | (142,499) | (144,822) |
Total benefit cost | (3,620) | (4,061) | (4,476)
Contributions | 6,899 | 6,384 |
Amount prepaid (liability) at end of year | (139,220) | (142,499) | (144,822)
Amount recognized in AOCL | 40,048 | 25,454 | 26,486
Net assets/(liabilities) at end of year | $ (99,172) | $ (117,045) | $ (118,336)

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