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Accounts payable and accrued expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Accounts payable and accrued expenses [Abstract]    
Accounts payable $ 10,885 $ 8,883
Accrued interest 5,460 3,026
Accrued voyage expenses 3,237 2,274
Accrued employee compensation 3,043 2,566
Other 6,009 [1] 679
Total accounts payable and accrued expenses $ 28,634 $ 17,427
[1] Other includes accrued OPEX and accrued CAPEX in 2018