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Exploration and Evaluation Assets - Schedule of Assets (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Exploration and evaluation assets, beginning of year $ 191,865  
Exploration and evaluation expense (15,212) $ (14,011)
Exploration and evaluation assets, end of year 172,824 191,865
Exploration and evaluation assets    
Reconciliation of changes in intangible assets other than goodwill [abstract]    
Exploration and evaluation assets, beginning of year 191,865 320,210
Capital expenditures 3,298 4,490
Property acquisitions 1,100 0
Divestitures (166) 0
Property swaps 408 468
Impairment 0 (113,058)
Exploration and evaluation expense (15,212) (14,011)
Transfers to oil and gas properties (7,727) (8,585)
Foreign currency translation (742) 2,351
Exploration and evaluation assets, end of year $ 172,824 $ 191,865