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Income and other taxes - Income tax (expense) recovery (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Current tax (expense) recovery: |  |
Current period before undernoted items | $ (115,629) | $ (27,759)
Adjustments to prior years | (138) | 2,563
Current tax recovery (expense) | (115,767) | (25,196)
Deferred tax recovery (expense): |  |
Origination and reversal of temporary differences | 4,360 | 89,301
Adjustments to prior years | (235) | (1,067)
Changes in tax rates | 3,630 | (5,031)
Other | (2,415) | 4,098
Deferred tax recovery (expense) | 5,340 | 87,301
Tax (expense) recovery | $ (110,427) | $ 62,105

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