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Consolidated Balance Sheets (Parenthetical) - CAD CAD in Thousands | 12 Months Ended
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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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