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Interest expense and finance costs (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Interest Expense And Finance Costs [Line Items]        
Interest incurred     $ 6,921,679 $ 5,386,885
Capitalized interest     0 (1,945,451)
Amortization of deferred financing charges     1,472,030 697,794
Interest Expense, Total $ 3,960,098 $ 2,529,459 $ 8,393,709 $ 4,139,228