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Net income (loss) per common share - Reconciliation of denominator used for calculation of basic and diluted net income (loss) per common share (Details) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Earnings per share [abstract]
Denominator for basic net income (loss) per common share	86,768,589	89,783,883
Effect of dilutive stock options	56,359	0
Denominator for diluted net income (loss) per common share	86,824,948	89,783,883

X

- 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]]

+ References

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- Definition

The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options.

+ References

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- Definition

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.

+ References

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