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Oil and Gas Properties - Schedule of PPE Activity, Oil and Gas (Details) - Oil and gas assets - CAD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of year | $ 5,387,889 | $ 5,817,889
Capital expenditures | 275,850 | 549,343
Property acquisitions |  | 2,636
Transfers from exploration and evaluation assets | 8,585 | 16,204
Change is asset retirement obligations | 94,994 | 23,894
Divestitures |  | (379)
Property swaps | (1,012) | 1,773
Impairment | (2,247,162) | (180,000)
Foreign currency translation | 37,263 | (118,204)
Depletion | (478,859) | (725,267)
Balance, end of year | 3,077,548 | 5,387,889
Cost |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of year | 11,128,297 | 10,744,533
Capital expenditures | 275,850 | 549,343
Property acquisitions |  | 2,636
Transfers from exploration and evaluation assets | 8,585 | 16,204
Change is asset retirement obligations | 94,994 | 23,894
Divestitures |  | (2,069)
Property swaps | (1,190) | 1,773
Impairment | 0 | 0
Foreign currency translation | (82,860) | (208,017)
Depletion | 0 | 0
Balance, end of year | 11,423,676 | 11,128,297
Accumulated depletion |  |
Reconciliation of changes in property, plant and equipment [abstract] |  |
Balance, beginning of year | (5,740,408) | (4,926,644)
Capital expenditures | 0 | 0
Property acquisitions |  | 0
Transfers from exploration and evaluation assets | 0 | 0
Change is asset retirement obligations | 0 | 0
Divestitures |  | 1,690
Property swaps | 178 | 0
Impairment | (2,247,162) | (180,000)
Foreign currency translation | 120,123 | 89,813
Depletion | (478,859) | (725,267)
Balance, end of year | $ (8,346,128) | $ (5,740,408)

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- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_i&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of depreciation of property, plant and equipment. [Refer: Depreciation and amortisation expense; Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_vii&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 75 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_75_a&doctype=Standard -URIDate 2020-01-01 + Details
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