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Employee benefits - Reconciliation of net (liabilities) assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension Plans |  |  |
Reconciliation of net (liabilities) assets: |  |  |
Net (liabilities) assets at beginning of year | $ (8,290) | $ 9,013 |
Amount recognized in AOCL at beginning of year | 243,434 | 225,356 |
Amount prepaid (accrued) at beginning of year | 235,144 | 234,369 |
Total cost (benefit) | 18,648 | (545) | $ (3,810)
Contributions | 230 | 230 |
Amount prepaid (accrued) at end of year | 216,726 | 235,144 | 234,369
Amount recognized in AOCL | (200,094) | (243,434) | (225,356)
Net (liabilities) assets at end of year | 16,632 | (8,290) | 9,013
OPEB Plan |  |  |
Reconciliation of net (liabilities) assets: |  |  |
Net (liabilities) assets at beginning of year | (118,336) | (159,958) |
Amount recognized in AOCL at beginning of year | (26,486) | 12,993 |
Amount prepaid (accrued) at beginning of year | (144,822) | (146,965) |
Total cost (benefit) | 4,061 | 4,476 | 6,088
Contributions | 6,384 | 6,619 |
Amount prepaid (accrued) at end of year | (142,499) | (144,822) | (146,965)
Amount recognized in AOCL | 25,454 | 26,486 | (12,993)
Net (liabilities) assets at end of year | $ (117,045) | $ (118,336) | $ (159,958)

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