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Voyage Expenses and Vessel Operating Expenses - Vessel operating expenses (Table) (Details) - USD ($)
$ in Thousands
12 Months Ended
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