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Supplemental Information - Change in Non-Cash Working Capital Items (Details) - CAD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Additional information [abstract] |  |
Trade and other receivables | $ 66,285 | $ (62,198)
Trade and other payables | (51,499) | (50,660)
Trade and other receivables/payables | 14,786 | (112,858)
Changes in non-cash working capital related to: |  |
Change in non-cash working capital | 48,758 | (52,070)
Investing activities | (32,031) | (62,485)
Foreign currency translation on non-cash working capital | (1,941) | 1,697
Changes in non-cash working capital | $ 14,786 | $ (112,858)

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- Definition Adjustments for decrease (increase) in trade and other receivables to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Trade and other receivables; 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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