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Consolidated Statements of Loss and Comprehensive Loss - CAD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Revenue [abstract]    
Petroleum and natural gas sales $ 975,477 $ 1,805,919
Royalties (163,735) (320,241)
Revenue, net of royalties 811,742 1,485,678
Expenses    
Operating 331,345 397,716
Transportation 28,437 43,942
Blending and other 48,381 68,795
General and administrative 34,268 45,469
Exploration and evaluation 14,011 11,764
Depletion and depreciation 486,380 731,686
Impairments 2,360,220 187,822
Financing and interest 125,441 125,865
Financial derivatives (gain) loss (29,336) 7,197
Foreign exchange loss (gain) 8,688 (61,787)
Gain on dispositions (901) (2,238)
Other income (5,304) (7,526)
Total expenses 3,411,099 1,564,599
Net loss before income taxes (2,599,357) (78,921)
Income tax (recovery) expense    
Current income tax expense 574 2,093
Deferred income tax (recovery) expense (160,967) (68,555)
Income tax recovery (160,393) (66,462)
Net loss (2,438,964) (12,459)
Other comprehensive income [abstract]    
Foreign currency translation adjustment 62,752 (111,650)
Comprehensive loss $ (2,376,212) $ (124,109)
Net loss per common share    
Basic (in cad per share) $ (4.35) $ (0.02)
Diluted (in cad per share) $ (4.35) $ (0.02)
Weighted average common shares    
Basic (in shares) 560,657 557,048
Diluted (in shares) 560,657 557,048