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Capital Management (Details) - CAD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Undrawn Credit Facilities and Net Debt Ratio [Abstract] |  |  |
Undrawn borrowing facilities | $ 367,200 |  |
Funds From Operations [Abstract] |  |  |
Cash flow from operating activities | 353,096 | $ 834,939 |
Change in non-cash working capital | (48,758) | 52,070 |
Asset retirement obligations settled | 7,168 | 15,417 |
Adjusted funds flow | 311,506 | 902,426 |
Net Debt [Abstract] |  |  |
Credit facilities - principal | 649,221 | 505,412 |
Long-term notes - principal | 1,132,868 | 1,328,175 |
Trade and other payables | 155,955 | 207,454 |
Cash | 0 | (5,572) | $ 0
Trade and other current receivables | (107,477) | (173,762) |
Net debt | 1,847,601 | 1,871,791 |
Cost |  |  |
Net Debt [Abstract] |  |  |
Credit facilities - principal | 651,173 | 506,471 |
Long-term notes - principal | 1,147,950 | 1,337,200 |
Liquidity risk |  |  |
Undrawn Credit Facilities and Net Debt Ratio [Abstract] |  |  |
Undrawn borrowing facilities | 367,200 | $ 523,800 |
Net Debt [Abstract] |  |  |
Trade and other payables | $ 155,955 |  |

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- Definition The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B13 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_i&doctype=Standard -URIDate 2020-01-01 + Details
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