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Earnings per share | 9 Months Ended
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Sep. 30, 2014
Earnings Per Share [Abstract] |
Earnings per share | Earnings (loss) per share The following sets forth the computation of basic and diluted earnings (loss) per share for the three and nine months ended September 30, 2014 and 2013:
|  |  | For the three months ended |  | For the nine months ended
|  |  | September 30, 2014 |  | September 30, 2013 |  | September 30, 2014 |  | September 30, 2013
Weighted-average number of common shares outstanding: |  |  |  |  |  |  |  |
| Basic number of common shares outstanding |  | 103,295,920 |  |  | 89,620,394 |  |  | 103,275,204 |  |  | 82,630,430 |
| Dilutive effect of options |  | — |  |  | 294,434 |  |  | 1,494,711 |  |  | — |
| Dilutive effect of warrants |  | — |  |  | 1,000,977 |  |  | 1,684,860 |  |  | 823,405 |
| Diluted number of common shares outstanding |  | 103,295,920 |  |  | 90,915,805 |  |  | 106,454,775 |  |  | 83,453,835 |
Basic net income (loss) per common share: |  |  |  |  |  |  |  |
| Net income (loss) |  | $ | (5,997 | ) |  | $ | 46,570 |  |  | $ | 65,074 |  |  | $ | 147,223 |
| Net income allocated to participating shares |  | — |  |  | (322 | ) |  | (420 | ) |  | (1,099 | )
| Net income (loss) available to common shareholders |  | $ | (5,997 | ) |  | $ | 46,248 |  |  | $ | 64,654 |  |  | $ | 146,124 |
| Basic net income (loss) per common share |  | $ | (0.06 | ) |  | $ | 0.52 |  |  | $ | 0.63 |  |  | $ | 1.77 |
Diluted net income (loss) per common share: |  |  |  |  |  |  |  |
| Net income (Loss) |  | $ | (5,997 | ) |  | $ | 46,570 |  |  | $ | 65,074 |  |  | $ | 147,223 |
| Net income allocated to participating securities |  | — |  |  | (318 | ) |  | (408 | ) |  | (1,089 | )
| Net income (loss) available to common shareholders |  | $ | (5,997 | ) |  | $ | 46,252 |  |  | $ | 64,666 |  |  | $ | 146,134 |
| Diluted net income (loss) per common share |  | $ | (0.06 | ) |  | $ | 0.51 |  |  | $ | 0.61 |  |  | $ | 1.75 |
For the three months ended September 30, 2014, options of 11,327,302 and warrants of 4,651,163 were excluded from the computation of diluted loss per share. As a result of the net loss in the three months ended September 30, 2014, no allocation of the net loss has been made to participating shares in the calculation of diluted net loss per common share. For the three months ended September 30, 2013, anti-dilutive options of 3,887,829 were excluded from the computation of diluted earnings per share. For the nine months ended September 30, 2014 and 2013, anti-dilutive options of 4,553,159 and 3,579,271, respectively, were excluded from the computation of diluted earnings per share.

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