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Financial Instruments and Risk Management - Credit Risk (Details) - CAD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure of financial assets [line items] |  |
Current trade receivables | $ 107,477 | $ 173,762
Financial assets neither past due nor impaired | Current (less than 30 days) |  |
Disclosure of financial assets [line items] |  |
Current trade receivables | 104,210 | 169,500
Financial assets neither past due nor impaired | 31-60 days |  |
Disclosure of financial assets [line items] |  |
Current trade receivables | 1,493 | 1,199
Financial assets neither past due nor impaired | 61-90 days |  |
Disclosure of financial assets [line items] |  |
Current trade receivables | 220 | 342
Financial assets past due but not impaired | Past due (more than 90 days) |  |
Disclosure of financial assets [line items] |  |
Current trade receivables | $ 1,554 | 2,721
Trade receivable, purchasers of petroleum and natural gas |  |
Disclosure of financial assets [line items] |  |
Trade receivable typical collection period | 25 days |
Trade receivable, accrued petroleum and natural gas sales |  |
Disclosure of financial assets [line items] |  |
Included in accounts receivable | $ 81,300 | 138,000
Trade receivables |  |
Disclosure of financial assets [line items] |  |
Allowance for doubtful accounts | $ 2,000 | $ 1,600
Minimum | Trade receivable, joint interest receivable |  |
Disclosure of financial assets [line items] |  |
Trade receivable typical collection period | 1 month |
Maximum | Trade receivable, joint interest receivable |  |
Disclosure of financial assets [line items] |  |
Trade receivable typical collection period | 3 months |

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