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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Voyage Expenses and Vessel Operating Expenses [Abstract] |  |  |
Crew wages and related costs | $ 4,670 | $ 4,766 | $ 4,645
Insurance | 664 | 607 | 742
Spares, repairs and maintenance | 1,884 | 2,721 | 2,222
Lubricants | 517 | 501 | 496
Stores | 820 | 1,000 | 783
Other | 327 | 330 | 247
Total | $ 8,882 | $ 9,925 | $ 9,135

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