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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amount recognized in AOCL at beginning of year | $ 265,899 | $ 288,882 |
Recognized During Year: |  |  |
Recognized net actuarial loss | 18,876 | 20,880 | $ 23,508
Ocurring during the year: |  |  |
Net actuarial (gains) losses | (21,667) | (2,103) |
Total (decrease) increase in AOCL | (40,543) | (22,983) |
Amount recognized in AOCL at end of year | 225,356 | 265,899 | 288,882
OPEB Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amount recognized in AOCL at beginning of year | 32,152 | 21,472 |
Recognized During Year: |  |  |
Recognized net actuarial loss | 1,873 | 567 | 0
Ocurring during the year: |  |  |
Net actuarial (gains) losses | (17,286) | 11,247 |
Total (decrease) increase in AOCL | (19,159) | 10,680 |
Amount recognized in AOCL at end of year | $ 12,993 | $ 32,152 | $ 21,472

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