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Income Taxes - components of income tax expense (Details) - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes      
Current taxes $ (384) $ (867) $ (3,744)
Deferred taxes (98) (55,238) (3,141)
Resource property (expense) recovery (1,137) 487 (1,773)
Provision for income taxes $ (1,619) $ (55,618) $ (8,658)