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Accrued liabilities (Tables)
 12 Months Ended
Dec. 31, 2017
Accrued Liabilities [Abstract]  
Schedule of accrued liabilities
  
 
 
2016
 
 
2017
Audit fees
 
$
216
 
$
243
Legal fees
 
 
                         117
 
 
                           59
Other professional fees
 
 
7
 
 
86
Vessel Operating and voyage expenses
 
 
7,573
 
 
5,608
Loan interest and financing fees
 
 
3,539
 
 
4,287
Income tax
 
 
267
 
 
238
Total Accrued Liabilities
 
$
11,719
 
$
10,521