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Financial Instruments and Risk Management - Financial Derivatives Marked-To-Market (Details) - CAD ($) $ in Thousands	12 Months Ended
	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]

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No definition available.

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Realized Gain (Loss) On Financial Derivatives

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Unrealized and Realized Gain (Loss) on Financial Derivatives

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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)]

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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

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