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Shares - Antidilutive securities (Details) - CAD CAD / shares in Units, CAD in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income (loss) available to common shareholders	CAD 5,264	CAD (445)
Weighted average number of common shares (in shares)	26,697,066	29,965,899
Weighted average of effects:
Dilutive effect of treasury shares (in shares)	2,622,957	0
Dilutive effect of stock options (in shares)	285,703	0
Weighted average number of diluted common shares (in shares)	29,605,726	29,965,899
Basic net income (loss) per share (in CAD per share)	CAD 0.20	CAD (0.01)
Diluted net income (loss) per share (in CAD per share)	CAD 0.18	CAD (0.01)
Stock options
Weighted average of effects:
Anti-dilutive awards not considered in computing diluted earnings per share (in shares)	469,819	1,176,080
Treasury shares
Weighted average of effects:
Anti-dilutive awards not considered in computing diluted earnings per share (in shares)	0	2,213,247
Convertible debentures
Weighted average of effects:
Anti-dilutive awards not considered in computing diluted earnings per share (in shares)	2,949,309

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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