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Voyage Expenses and Vessel Operating Expenses (Table) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Voyage expenses:      
Commissions $ 4,440 $ 4,816 $ 4,421
Bunkers 4,726 2,601 1,753
Port expenses 3,593 892 259
Other 2,406 1,971 457
Total 15,165 10,280 6,890
Vessel operating expenses:      
Crew costs and related costs 43,699 37,342 31,788
Insurance expense 5,035 5,772 5,004
Spares, repairs, maintenance and other expenses 12,731 11,688 11,521
Stores and lubricants 7,937 8,203 7,790
Management fees (Note 4) 11,491 10,661 11,219
Vetting, insurances, spares and repairs (Note 4) 138 205 489
Other operating expenses 5,114 3,632 2,522
Total $ 86,145 $ 77,503 $ 70,333