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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - CAD / shares | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 19, 2014
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Statement of Stockholders' Equity [Abstract] |  |  |
Dividends (note 17(d)) ($0.08 per share) | CAD 0.08 | CAD 0.08 | CAD 0.08

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Balance Type: | na
Period Type: | instant

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