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Interest expense and finance costs (Tables)
 3 Months Ended
Mar. 31, 2017
Interest Expense And Finance Costs [Abstract]  
Interest And Finance Costs
 
 
Three months ended
 
 
 
Mar 31, 2017
 
Mar 31, 2016
 
Interest incurred
 
 
4,303,181
 
 
3,833,148
 
Amortization of deferred financing charges
 
 
607,740
 
 
600,463
 
 
 
 
4,910,921
 
 
4,433,611