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Voyage expenses and vessel operating expenses (Table) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Voyage expenses:      
Commissions $ 2,809 $ 1,952 $ 2,171
Bunkers 1,349 89 4,360
Port expenses 624 4 2,217
Other 1,519 885 365
Total 6,301 2,930 9,113
Vessel operating expenses:      
Crew costs and related costs 16,624 13,375 14,794
Insurance expense 2,388 1,796 2,112
Spares, repairs, maintenance and other expenses 8,836 5,001 4,396
Stores and lubricants 4,593 3,251 3,451
Management fees (Note 5) 4,976 3,917 4,221
Other operating expenses 1,304 3,209 1,674
Total $ 38,721 $ 30,549 $ 30,648