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Petroleum and Natural Gas Sales (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [line items]    
Petroleum and natural gas sales $ 975,477 $ 1,805,919
Trade receivable, accrued petroleum and natural gas sales    
Disclosure of operating segments [line items]    
Included in accounts receivable 81,300 138,000
Canada    
Disclosure of operating segments [line items]    
Petroleum and natural gas sales 571,741 1,077,724
U.S.    
Disclosure of operating segments [line items]    
Petroleum and natural gas sales 403,736 728,195
Light oil and condensate    
Disclosure of operating segments [line items]    
Petroleum and natural gas sales 623,585 1,138,650
Light oil and condensate | Canada    
Disclosure of operating segments [line items]    
Petroleum and natural gas sales 296,125 538,487
Light oil and condensate | U.S.    
Disclosure of operating segments [line items]    
Petroleum and natural gas sales 327,460 600,163
Heavy oil    
Disclosure of operating segments [line items]    
Petroleum and natural gas sales 236,235 500,187
Heavy oil | Canada    
Disclosure of operating segments [line items]    
Petroleum and natural gas sales 236,235 500,187
Heavy oil | U.S.    
Disclosure of operating segments [line items]    
Petroleum and natural gas sales 0 0
NGL    
Disclosure of operating segments [line items]    
Petroleum and natural gas sales 40,882 69,077
NGL | Canada    
Disclosure of operating segments [line items]    
Petroleum and natural gas sales 6,037 8,430
NGL | U.S.    
Disclosure of operating segments [line items]    
Petroleum and natural gas sales 34,845 60,647
Natural gas sales    
Disclosure of operating segments [line items]    
Petroleum and natural gas sales 74,775 98,005
Natural gas sales | Canada    
Disclosure of operating segments [line items]    
Petroleum and natural gas sales 33,344 30,620
Natural gas sales | U.S.    
Disclosure of operating segments [line items]    
Petroleum and natural gas sales $ 41,431 $ 67,385