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Interest expense and finance costs (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Interest Expense And Finance Costs [Line Items]        
Interest incurred     $ 9,023,901 $ 5,032,293
Capitalized interest     (2,266,311) (2,744,165)
Amortization of deferred financing charges     1,188,100 658,624
Interest expense and finance costs $ 3,806,461 $ 1,056,730 $ 7,945,689 $ 2,946,752