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Income Taxes - Earnings and income taxes by jurisdiction (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of geographical areas [line items] |  |
Earnings (loss) before income taxes | $ 135,018 | $ 39,929
Current income taxes | 8,747 | 20,785
Deferred income taxes (recovery) | 52,330 | (147,091)
Income tax expense (recovery) | 61,077 | (126,306)
Canada [member] |  |
Disclosure of geographical areas [line items] |  |
Earnings (loss) before income taxes | 229,429 | (257,291)
Current income taxes | 7,969 | 5,913
Deferred income taxes (recovery) | 60,010 | (149,284)
Foreign [member] |  |
Disclosure of geographical areas [line items] |  |
Earnings (loss) before income taxes | (94,411) | 297,220
Current income taxes | 778 | 14,872
Deferred income taxes (recovery) | $ (7,680) | $ 2,193

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