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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