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Voyage Expenses and Vessel Operating Expenses - Vessel operating expenses (Table) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Voyage Expenses and Vessel Operating Expenses [Abstract] |  |  |
Crew wages and related costs | $ 4,645 | $ 4,829 | $ 5,919
Insurance | 742 | 798 | 929
Spares, repairs and maintenance | 2,222 | 1,699 | 1,664
Lubricants | 496 | 462 | 534
Stores | 783 | 633 | 939
Other | 247 | 267 | 336
Total | $ 9,135 | $ 8,688 | $ 10,321

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