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Income Taxes - Earnings and income taxes by jurisdiction (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of geographical areas [line items] |  |
Earnings (loss) before income taxes | $ (39,531) | $ 135,018
Current income taxes | (5,028) | 8,747
Deferred income taxes (recovery) | 18,694 | 52,330
Income tax expense (recovery) | 13,666 | 61,077
Canada [member] |  |
Disclosure of geographical areas [line items] |  |
Earnings (loss) before income taxes | 72,809 | 229,429
Current income taxes | (394) | 7,969
Deferred income taxes (recovery) | 9,122 | 60,010
Foreign [member] |  |
Disclosure of geographical areas [line items] |  |
Earnings (loss) before income taxes | (112,340) | (94,411)
Current income taxes | (4,634) | 778
Deferred income taxes (recovery) | $ 9,572 | $ (7,680)

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