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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2017
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Schedule of Basic and Diluted Common Shares Outstanding, Calculated on Weighted Average Basis | The number of basic shares outstanding and diluted common shares, calculated on a weighted average basis, is as follows:
|  |  | December 31 |  |  |  | December 31 |
|  | 2017 |  |  | 2016 |
|  |  | # |  |  |  | # |
Basic shares outstanding |  |  | 113,991,507 |  |  |  | 107,006,168 |
Share options (dilutive effect of 4,426,237 options; 2016 – 3,655,020 options) |  |  | 361,413 |  |  |  | 319,623 |
Diluted shares |  |  | 114,352,920 |  |  |  | 107,325,791 |

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