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Income Taxes - Continuity of Net Deferred Income Tax Liability (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | $ (167,456) | $ (86,533)
Recognized in Net Income | (31,716) | (79,968)
Foreign Currency Translation Adjustment | (9,442) | (955)
Ending balance | (208,614) | (167,456)
Non-capital loss carry-forwards | 1,800,000 | 2,000,000
Deferred income tax asset | 57,244 | 0
Petroleum and natural gas properties |  |
Changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (760,579) | (502,625)
Recognized in Net Income | (18,081) | (257,800)
Foreign Currency Translation Adjustment | (28,854) | (154)
Ending balance | (807,514) | (760,579)
Financial derivatives |  |
Changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 0 |
Recognized in Net Income | (2,506) |
Ending balance | (2,506) | 0
Other |  |
Changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (21,616) | (22,377)
Recognized in Net Income | (1,137) | 624
Foreign Currency Translation Adjustment | 1,802 | 137
Ending balance | (20,951) | (21,616)
Asset retirement obligations |  |
Changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 185,336 | 187,840
Recognized in Net Income | (40,693) | (2,436)
Foreign Currency Translation Adjustment | 632 | (68)
Ending balance | 145,275 | 185,336
Financial derivatives |  |
Changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 31,492 | 5,410
Recognized in Net Income | (31,492) | 26,082
Ending balance | 0 | 31,492
Non-capital losses |  |
Changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 342,884 | 241,514
Recognized in Net Income | 18,707 | 104,479
Foreign Currency Translation Adjustment | 12,242 | (3,109)
Ending balance | 373,833 | 342,884
Finance costs |  |
Changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 55,027 | 3,705
Recognized in Net Income | 43,486 | 49,083
Foreign Currency Translation Adjustment | 4,736 | 2,239
Ending balance | $ 103,249 | $ 55,027

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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2022-03-24 -Paragraph 81 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2022-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2022-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 54 -Subparagraph o -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_54_o&doctype=Standard -URIDate 2022-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 56 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_56&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2022-03-24 -Paragraph 81 -Subparagraph g -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2022-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2022-03-24 -Paragraph 81 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2022-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The increase (decrease) in deferred tax liability (asset) resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Deferred tax liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2022-03-24 -Paragraph 81 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2022-en-r&anchor=para_81&doctype=Standard -URIDate 2022-03-24 + Details
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