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Earnings per share (Tables) | 6 Months Ended
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Jun. 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 per share for the three and six months ended June 30, 2014 and 2013:
|  |  | For the three months ended |  | For the six months ended
|  |  | June 30, 2014 |  | June 30, 2013 |  | June 30, 2014 |  | June 30, 2013
Weighted-average number of common shares outstanding: |  |  |  |  |  |  |  |
| Basic number of common shares outstanding |  | 103,264,616 |  |  | 78,432,132 |  |  | 103,264,616 |  |  | 78,432,132 |
| Dilutive effect of options |  | 1,490,091 |  |  | 22,216 |  |  | 1,520,726 |  |  | — |
| Dilutive effect of warrants |  | 1,679,174 |  |  | 799,920 |  |  | 1,720,373 |  |  | 715,840 |
| Diluted number of common shares outstanding |  | 106,433,881 |  |  | 79,254,268 |  |  | 106,505,715 |  |  | 79,147,972 |
Basic net income per common share: |  |  |  |  |  |  |  |
| Net income |  | $ | 31,292 |  |  | $ | 26,223 |  |  | $ | 71,071 |  |  | $ | 100,653 |
| Net income allocated to participating shares |  | (200 | ) |  | (206 | ) |  | (452 | ) |  | (790 | )
| Net income available to common shareholders |  | $ | 31,092 |  |  | $ | 26,017 |  |  | $ | 70,619 |  |  | $ | 99,863 |
| Basic net income per common share |  | $ | 0.30 |  |  | $ | 0.33 |  |  | $ | 0.68 |  |  | $ | 1.27 |
Diluted net income per common share: |  |  |  |  |  |  |  |
| Net income |  | $ | 31,292 |  |  | $ | 26,223 |  |  | $ | 71,071 |  |  | $ | 100,653 |
| Income allocated to participating securities |  | (194 | ) |  | (204 | ) |  | (439 | ) |  | (783 | )
| Net income available to common shareholders |  | $ | 31,098 |  |  | $ | 26,019 |  |  | $ | 70,632 |  |  | $ | 99,870 |
| Diluted net income per common share |  | $ | 0.29 |  |  | $ | 0.33 |  |  | $ | 0.66 |  |  | $ | 1.26 |

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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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