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Employee benefits - Reconciliation of net (liabilities) assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pension Plans |  |  |
Reconciliation of net (liabilities) assets: |  |  |
Net (liabilities) assets at beginning of year | $ 9,013 | $ (35,568) |
Accumulated other comprehensive loss at beginning of year | 225,356 | 265,899 |
Amount prepaid (accrued) at beginning of year | 234,369 | 230,331 |
Net periodic benefit cost | 545 | 3,810 | $ (6,165)
Amount prepaid (accrued) at end of year | 235,144 | 234,369 | 230,331
Accumulated other comprehensive loss | (243,434) | (225,356) | (265,899)
Net (liabilities) assets at end of year | (8,290) | 9,013 | (35,568)
Contributions | 230 | 228 |
OPEB Plan |  |  |
Reconciliation of net (liabilities) assets: |  |  |
Net (liabilities) assets at beginning of year | (159,958) | (179,210) |
Accumulated other comprehensive loss at beginning of year | 12,993 | 32,152 |
Amount prepaid (accrued) at beginning of year | (146,965) | (147,058) |
Net periodic benefit cost | (4,416) | (6,088) | (6,193)
Amount prepaid (accrued) at end of year | (144,822) | (146,965) | (147,058)
Accumulated other comprehensive loss | 26,486 | (12,993) | (32,152)
Net (liabilities) assets at end of year | (118,336) | (159,958) | $ (179,210)
Contributions | $ 6,619 | $ 6,181 |

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