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Earnings per share (Tables) | 9 Months Ended
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Sep. 30, 2014
Earnings Per Share [Abstract] |
Schedule of reconciliation of basic and diluted weighted average shares outstanding | 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 |

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + 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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