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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

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