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Asset Retirement Obligations - Changes In Asset Retirement Obligations (Details) - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Reconciliation of changes in other provisions [Abstract] |  |
Accretion | $ 8,978 | $ 13,713
Government grants | (2,128) | 0
Less current portion of asset retirement obligations | 11,820 | 11,579
Non-current portion of asset retirement obligations | 748,563 | 656,395
Asset retirement obligation |  |
Reconciliation of changes in other provisions [Abstract] |  |
Balance, beginning of the year | 667,974 | 646,898
Liabilities incurred | 15,189 | 21,748
Liabilities settled | (7,168) | (15,417)
Liabilities acquired from property acquisitions | 0 | 1,648
Liabilities divested | (721) | (1,331)
Property swaps | (525) | 792
Accretion | 8,978 | 13,713
Government grants | (2,128) | 0
Change in estimate | (12,771) | 19,632
Changes in discount rates and inflation rates | 92,576 | (17,486)
Foreign currency translation | (1,021) | (2,223)
Balance, end of the year | $ 760,383 | $ 667,974

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- Definition The increase in other provisions resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2020-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2020-en-r&anchor=para_84&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The decrease in other provisions resulting from the loss of control of a subsidiary. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2020-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2020-en-r&anchor=para_84&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of expense recognised due to the unwinding of the discount on provisions, resulting from the effect of the passage of time. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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