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Consolidated Balance Sheets (Parenthetical) - CAD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Property, plant and equipment, accumulated depreciation | $ 302,682 | $ 276,185
Common shares, issued (in shares) | 31,011,831 | 27,502,912
Common shares, outstanding (in shares) | 31,011,831 | 27,502,912
Treasury shares (in shares) | 1,845,201 | 1,725,467

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