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Per share amounts (Details) - CAD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Basic earnings (loss) per share computation
Net earnings (loss) attributable to equity holders	$ (204,942)	$ (61,611)
Weighted average common shares outstanding	395,792,686	395,792,522
Basic earnings (loss) per common share	$ (0.52)	$ (0.16)
Diluted earnings (loss) per share computation
Net earnings (loss) attributable to equity holders	$ (204,942)	$ (61,611)
Weighted average common shares outstanding	395,792,686	395,792,522
Weighted average common shares outstanding, assuming dilution	395,793,000	395,793,000
Diluted earnings (loss) per common share	$ (0.52)	$ (0.16)

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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).

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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]]

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The number of dilutive potential ordinary shares that relate to the assumed conversion of the entity's convertible instruments.

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The profit (loss) attributable to owners of the parent. [Refer: Profit (loss)]

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The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

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