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Consolidated Balance Sheets (Parenthetical) - CAD CAD in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Plant and equipment, net of accumulated depreciation $204,860 (2015 - $188,398) (note 9)	CAD 204,860	CAD 188,398
Common shares, authorized	unlimited	unlimited
Common Stock, Shares, Issued	30,518,907	33,150,281
Common Stock, Shares, Outstanding	30,518,907	33,150,281
Treasury shares (December 31, 2016 - 2,213,247 (December 31, 2015 - 1,256,803)) (note 17(a))	2,213,247	1,256,803

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of previously issued common shares repurchased by the issuing entity and held in treasury.

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