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Income Taxes - Movement in net deferred tax assets and liabilities (Details) - CAD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Net deferred tax asset, beginning of year $ 848,704 $ 820,048
Recovery for the year in net earnings 147,091 22,425
Recovery (expense) for the year in other comprehensive income (851) 1,490
Change to equity accounting - JV Inkai 10,849 0
Effect of movements in exchange rates 219 4,741
Net deferred tax asset, end of year $ 1,006,012 $ 848,704