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Income Taxes - Provision For Income Taxes (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Income Taxes [Abstract] |  |
Net income (loss) before income taxes | $ 1,694,840 | $ (2,599,357)
Expected income taxes at the statutory rate | $ 425,744 | $ (660,757)
Tax rate | 25.12% | 25.42%
Increase (Decrease) From Tax Effects [Abstract] |  |
Share-based compensation | $ 1,605 | $ 1,834
Effect of foreign exchange | (841) | 1,017
Effect of change in income tax rates | (65) | 10,969
Effect of rate adjustments for foreign jurisdictions | (21,746) | 22,375
Effect of change in deferred tax benefit not recognized | (325,295) | 444,117
Effect of U.S. tax change | 0 | 19,807
Adjustments and assessments | 1,838 | 245
Income tax expense (recovery) | $ 81,240 | $ (160,393)

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_c_ii&doctype=Standard -URIDate 2021-03-24 + Details
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