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Accrued liabilities (Tables)
 12 Months Ended
Dec. 31, 2016
Accrued Liabilities [Abstract]  
Schedule of accrued liabilities
  
 
 
2015
 
 
2016
Audit fees
 
$
386
 
$
216
Legal fees
 
 
449
 
 
                         117
Other professional fees
 
 
26
 
 
7
Vessel Operating and voyage expenses
 
 
9,555
 
 
7,573
Loan interest and financing fees
 
 
4,357
 
 
3,539
Income tax
 
 
                            -   
 
 
267
Total Accrued Liabilities
 
$
14,773
 
$
11,719