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Accrued liabilities (Table) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accrued Liabilities (Abstract)    
Audit fees $ 243 $ 216
Legal fees 59 117
Other professional fees 86 7
Vessel Operating and voyage expenses 5,608 7,573
Loan interest and financing fees 4,287 3,539
Income tax 238 267
Total Accrued Liabilities $ 10,521 $ 11,719