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Financial Instruments and Risk Management - Financial Derivatives Marked-To-Market (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Financial Instruments [Abstract] |  |
Realized financial derivatives gain | $ (47,836) | $ (75,620)
Unrealized financial derivatives loss | 18,500 | 82,817
Financial derivatives (gain) loss | $ (29,336) | $ 7,197

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- Definition Financial Instruments [Abstract] + References No definition available. + Details
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- Definition Realized Gain (Loss) On Financial Derivatives + References No definition available. + Details
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- Definition Unrealized and Realized Gain (Loss) on Financial Derivatives + References No definition available. + Details
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- Definition Adjustments for gains (losses) on changes in the fair value of derivatives to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: At fair value [member]; Derivatives [member]; Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 20 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_20&doctype=Standard -URIDate 2020-01-01 + Details
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