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Accrued liabilities (Tables) | 12 Months Ended
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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

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