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Earnings Per Share (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Basic |  |  |  |
Net income attributable to common stockholders | $ 10,498,640 | $ 11,466,057 | $ 25,509,109 | $ 17,340,818
Weighted average number of common shares outstanding | 50,955,648 | 50,267,462 | 50,751,247 | 49,804,457
Net income per common share (in dollars per share) | $ 0.21 | $ 0.23 | $ 0.50 | $ 0.35
Diluted |  |  |  |
Net income attributable to common stockholders | $ 10,498,640 | $ 11,466,057 | $ 25,509,109 | $ 17,340,818
Weighted average number of common shares outstanding | 50,955,648 | 50,267,462 | 50,751,247 | 49,804,457
Dilutive effect of of restricted stock units (in shares) |  |  | 143,284 |
Dilutive effect of warrants (in shares) |  | 434,280 |  | 425,442
Weighted average number of common shares outstanding | 50,955,648 | 50,701,742 | 50,894,531 | 50,229,899
Net income per common share (in dollars per share) | $ 0.21 | $ 0.23 | $ 0.50 | $ 0.35
Mr. Ivan Kaufman. | Performance |  |  |  |
Diluted |  |  |  |
Vesting period |  |  | 4 years |

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