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Per share amounts (Details) - CAD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Basic earnings (loss) per share computation
Net earnings (loss) attributable to equity holders	$ (53,169)	$ 74,000
Weighted average common shares outstanding	395,829,380	395,796,677
Basic earnings (loss) per common share	$ (0.13)	$ 0.19
Diluted earnings (loss) per share computation
Net earnings (loss) attributable to equity holders	$ (53,169)	$ 74,000
Weighted average common shares outstanding	395,829,380	395,796,677
Dilutive effect of stock options	214,000	258,000
Weighted average common shares outstanding, assuming dilution	396,043,000	396,055,000
Diluted earnings (loss) per common share	$ (0.13)	$ 0.19

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- Definition

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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