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Per share amounts (Details) - CAD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Basic earnings (loss) per share computation |  |
Net earnings (loss) attributable to equity holders | $ 74,000 | $ 166,323
Weighted average common shares outstanding | 395,796,677 | 395,792,732
Basic earnings (loss) per common share | $ 0.19 | $ 0.42
Diluted earnings (loss) per share computation |  |
Net earnings (loss) attributable to equity holders | $ 74,000 | $ 166,323
Weighted average common shares outstanding | 395,796,677 | 395,792,732
Dilutive effect of stock options | 258,000 | 257,000
Weighted average common shares outstanding, assuming dilution | 396,055,000 | 396,050,000
Diluted earnings (loss) per common share | $ 0.19 | $ 0.42

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- Definition The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2019-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2019-en-r&anchor=para_66&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2019-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2019-en-r&anchor=para_66&doctype=Standard -URIDate 2019-03-27 + Details
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