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Employee benefits - Reconciliation of net (liabilities) assets (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pension Plans |  |  |
Reconciliation of net (liabilities) assets: |  |  |
Net (liabilities) assets at beginning of year | $ (52,616) | $ (68,735) |
Amount recognized in AOCL at beginning of year | 288,882 | 304,330 |
Amount prepaid (accued) at beginning of year | 236,266 | 235,595 |
Net periodic benefit (credit) cost | (6,165) | (19,559) | $ (5,513)
Contributions | 230 | 20,230 |
Amount prepaid (accrued) at end of year | 230,331 | 236,266 | 235,595
Accumulated other comprehensive loss | (265,899) | (288,882) | (304,330)
Net (liabilities) assets at end of year | (35,568) | (52,616) | (68,735)
OPEB Plan |  |  |
Reconciliation of net (liabilities) assets: |  |  |
Net (liabilities) assets at beginning of year | (168,681) | (153,415) |
Amount recognized in AOCL at beginning of year | 21,472 | 5,720 |
Amount prepaid (accued) at beginning of year | (147,209) | (147,695) |
Net periodic benefit (credit) cost | (6,193) | (6,714) | (4,402)
Contributions | 6,344 | 7,200 |
Amount prepaid (accrued) at end of year | (147,058) | (147,209) | (147,695)
Accumulated other comprehensive loss | (32,152) | (21,472) | (5,720)
Net (liabilities) assets at end of year | $ (179,210) | $ (168,681) | $ (153,415)

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