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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, 2023 | Dec. 31, 2022
Current tax (expense) recovery: |  |
Current period before undernoted items | $ (64,679) | $ (127,254)
Adjustments to prior years including resolution for certain outstanding audits | 14,755 | (324)
Current tax recovery (expense) | (49,924) | (127,578)
Deferred tax recovery (expense): |  |
Origination and reversal of temporary differences | 46,982 | 9,589
Adjustments to prior years including resolution for certain outstanding audits | 6,904 | (400)
Changes in tax rates | (5,828) | (23)
Impact of foreign exchange and other | 377 | (1,447)
Deferred tax recovery (expense) | 48,435 | 7,719
Total income tax expense | $ (1,489) | $ (119,859)

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