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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, 2020 | Dec. 31, 2019
Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Amount recognized in AOCL at beginning of year | $ 288,882 | $ 304,330
Recognized During Year: |  |
Actuarial losses | (20,880) | (23,508)
Ocurring during the year: |  |
Net acturial (gains) losses | (2,103) | 8,060
Total (decrease) increase in AOCL | (22,983) | (15,448)
Amount recognized in AOCL at end of year | 265,899 | 288,882
OPEB Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Amount recognized in AOCL at beginning of year | 21,472 | 5,720
Recognized During Year: |  |
Actuarial losses | (567) | 0
Ocurring during the year: |  |
Net acturial (gains) losses | 11,247 | 15,752
Total (decrease) increase in AOCL | 10,680 | 15,752
Amount recognized in AOCL at end of year | $ 32,152 | $ 21,472

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