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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, 2019 | Dec. 31, 2018
Pension Plans |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Amount recognized in AOCL at beginning of year | $ 304,330 | $ 290,327
Recognized During Year: |  |
Prior service (cost) credit | 0 | 0
Actuarial losses | (23,508) | (20,260)
Ocurring during the year: |  |
Net acturial (gains) losses | 8,060 | 34,263
Total (decrease) increase in AOCL | (15,448) | 14,003
Amount recognized in AOCL at end of year | 288,882 | 304,330
OPEB Plan |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Amount recognized in AOCL at beginning of year | 5,720 | 24,079
Recognized During Year: |  |
Prior service (cost) credit | 0 | 3,470
Actuarial losses | 0 | (1,282)
Ocurring during the year: |  |
Net acturial (gains) losses | 15,752 | (20,547)
Total (decrease) increase in AOCL | 15,752 | (18,359)
Amount recognized in AOCL at end of year | $ 21,472 | $ 5,720

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