Income Taxes - Continuity of Net Deferred Income Tax Liability (Details) - CAD ($) $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Changes in deferred tax liability (asset) [abstract]
Beginning balance	$ 191,812	$ (208,614)
Recognized in Net Income	(114,927)	(297,629)
Business Combination		(100,852)
Foreign Currency Translation Adjustment	12,766	1,945
Ending balance	89,651	191,812
Non-capital loss carry-forwards	3,300,000	3,200,000
Non-capital loss carry-forwards that will expire	1,800,000	2,600,000
Non-capital loss carry-forwards with no expiration date	1,500,000	575,700
Deferred income tax asset	178,212	213,145
Deferred income tax liability	88,561	21,333
Petroleum and natural gas properties
Changes in deferred tax liability (asset) [abstract]
Beginning balance	(706,101)	(807,514)
Recognized in Net Income	(100,286)	(200,623)
Business Combination		111,131
Foreign Currency Translation Adjustment	(41,934)	11,921
Ending balance	(848,321)	(706,101)
Financial derivatives
Changes in deferred tax liability (asset) [abstract]
Beginning balance	(2,738)	(2,506)
Recognized in Net Income	(3,096)	(4,506)
Business Combination		4,738
Ending balance	(5,834)	(2,738)
Other
Changes in deferred tax liability (asset) [abstract]
Beginning balance	(13,046)	(20,951)
Recognized in Net Income	(1,434)	(8,225)
Foreign Currency Translation Adjustment	(119)	(320)
Ending balance	(14,599)	(13,046)
Asset retirement obligations
Changes in deferred tax liability (asset) [abstract]
Beginning balance	150,856	145,275
Recognized in Net Income	1,138	873
Business Combination		(6,575)
Foreign Currency Translation Adjustment	1,811	(121)
Ending balance	153,805	150,856
Non-capital losses
Changes in deferred tax liability (asset) [abstract]
Beginning balance	647,561	416,131
Recognized in Net Income	(44,671)	(79,343)
Business Combination		(156,385)
Foreign Currency Translation Adjustment	45,452	(4,298)
Ending balance	648,342	647,561
Finance costs
Changes in deferred tax liability (asset) [abstract]
Beginning balance	115,280	60,951
Recognized in Net Income	33,422	(5,805)
Business Combination		(53,761)
Foreign Currency Translation Adjustment	7,556	(5,237)
Ending balance	$ 156,258	$ 115,280

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Non-Capital Loss Carryforwards, Not Subject To Expiration

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Non-Capital Loss Carryforwards, Subject To Expiration

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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]]

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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]

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The amounts of income taxes payable in future periods in respect of taxable temporary differences. [Refer: Temporary differences [member]]

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The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets]

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The increase (decrease) in deferred tax liability (asset) resulting from business combinations. [Refer: Deferred tax liability (asset)]

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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)]

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