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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, 2021 | Dec. 31, 2020
Changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | $ (86,533) | $ (235,308)
Recognized in Net Income | (79,968) | 160,967
Foreign Currency Translation Adjustment | (955) | (12,192)
Ending balance | (167,456) | (86,533)
Non-capital loss carry-forwards | 2,000,000 | 2,200,000
Petroleum and natural gas properties |  |
Changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (502,625) | (881,994)
Recognized in Net Income | (257,800) | 378,321
Foreign Currency Translation Adjustment | (154) | 1,048
Ending balance | (760,579) | (502,625)
Financial derivatives |  |
Changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 0 | 0
Recognized in Net Income | 0 | 0
Ending balance | 0 | 0
Other |  |
Changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (22,377) | (2,403)
Recognized in Net Income | 624 | (18,839)
Foreign Currency Translation Adjustment | 137 | (1,135)
Ending balance | (21,616) | (22,377)
Asset retirement obligations |  |
Changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 187,840 | 164,523
Recognized in Net Income | (2,436) | 23,432
Foreign Currency Translation Adjustment | (68) | (115)
Ending balance | 185,336 | 187,840
Financial derivatives |  |
Changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 5,410 | 802
Recognized in Net Income | 26,082 | 4,608
Ending balance | 31,492 | 5,410
Non-capital losses |  |
Changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 241,514 | 386,717
Recognized in Net Income | 104,479 | (141,468)
Foreign Currency Translation Adjustment | (3,109) | (3,735)
Ending balance | 342,884 | 241,514
Finance costs |  |
Changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 3,705 | 97,047
Recognized in Net Income | 49,083 | (85,087)
Foreign Currency Translation Adjustment | 2,239 | (8,255)
Ending balance | $ 55,027 | $ 3,705

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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 2021-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_g_ii&doctype=Standard -URIDate 2021-03-24 + 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 2021-01-01 -Paragraph 81 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81&doctype=Standard -URIDate 2021-03-24 + Details
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