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Exploration and Evaluation Assets - Schedule of Assets (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Exploration and evaluation assets, beginning of year $ 320,210  
Exploration and evaluation expense (14,011) $ (11,764)
Exploration and evaluation assets, end of year 191,865 320,210
Exploration and evaluation assets    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Exploration and evaluation assets, beginning of year 320,210 358,935
Capital expenditures 4,490 2,948
Property acquisitions 0 1,523
Divestitures 0 (443)
Impairment (113,058) (7,822)
Property swaps 468 417
Exploration and evaluation expense (14,011) (11,764)
Transfers to oil and gas properties (8,585) (16,204)
Foreign currency translation 2,351 (7,380)
Exploration and evaluation assets, end of year $ 191,865 $ 320,210