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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Voyage Expenses and Vessel Operating Expenses [Abstract] |  |  |
Crew wages and related costs | $ 4,766 | $ 4,645 | $ 4,829
Insurance | 607 | 742 | 798
Spares, repairs and maintenance | 2,721 | 2,222 | 1,699
Lubricants | 501 | 496 | 462
Stores | 1,000 | 783 | 633
Other | 330 | 247 | 267
Total | $ 9,925 | $ 9,135 | $ 8,688

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