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INCOME TAX - Disclosure of deferred tax assets and liabilities (Details) - CAD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Income Tax [Abstract] |  |
Property, plant and equipment | $ (154,587) | $ (156,669)
Other financial assets | 5,714 | 2,951
Provisions | 20,422 | 17,009
Tax loss carry forwards | 89,391 | 86,006
Deferred tax liability | $ (39,060) | $ (50,703)

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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 2019-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Deferred tax assets loss carryforwards + References No definition available. + Details
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- Definition Deferred tax assets other. + References No definition available. + Details
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- Definition Deferred Tax Assets, Provisions. + References No definition available. + Details
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