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Shares (Tables) | 12 Months Ended
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Dec. 31, 2014
Equity [Abstract] |
Schedule of common shares issued and outstanding | Issued and outstanding:
|  | Voting common shares |  |  | Treasury shares |  |  | Common shares outstanding, net of treasury shares |
Issued and outstanding at December 31, 2012 |  | 36,251,006 |  |  | — |  |  | 36,251,006 |
Issued upon exercise of stock options |  | 295,230 |  |  | — |  |  | 295,230 |
Retired through Share Purchase Program (note 17(c)) |  | (1,800,000 | ) |  | — |  |  | (1,800,000 | )
Issued and outstanding at December 31, 2013 |  | 34,746,236 |  |  | — |  |  | 34,746,236 |
Issued upon exercise of stock options |  | 385,880 |  |  | — |  |  | 385,880 |
Issued upon exercise of senior executive stock options |  | 291,800 |  |  | — |  |  | 291,800 |
Purchase of treasury shares for settlement of certain equity classified stock-based compensation (note 23(d(ii)), 23(e) and 23(f(ii))) |  | — |  |  | (589,892 | ) |  | (589,892 | )
Retired through Share Purchase Program (note 17(c)) |  | (500,000 | ) |  | — |  |  | (500,000 | )
Issued and outstanding at December 31, 2014 |  | 34,923,916 |  |  | (589,892 | ) |  | 34,334,024 |
Schedule of net (loss) income per share | Net (loss) income per share
Year ended December 31, |  | 2014 |  |  | 2013 |
Net loss from continuing operations |  | $ | (697 | ) |  | $ | (18,047 | )
Net (loss) income from discontinued operations |  | (472 | ) |  | 87,231 |
Net (loss) income |  | $ | (1,169 | ) |  | $ | 69,184 |
Weighted average number of common shares |  | 35,014,418 |  |  | 36,269,996 |
Basic per share information |  |  |  |
Net loss from continuing operations |  | $ | (0.02 | ) |  | $ | (0.50 | )
Net (loss) income from discontinued operations |  | (0.01 | ) |  | 2.41 |
Net (loss) income |  | $ | (0.03 | ) |  | $ | 1.91 |
Dilutive effect of stock options and treasury shares |  | — |  |  | 342,957 |
Weighted average number of diluted common shares |  | 35,014,418 |  |  | 36,612,953 |
Diluted per share information |  |  |  |
Net loss from continuing operations |  | $ | (0.02 | ) |  | $ | (0.50 | )
Net (loss) income from discontinued operations |  | (0.01 | ) |  | 2.39 |
Net income |  | $ | (0.03 | ) |  | $ | 1.89 |

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- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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