Accounts payable and accrued expenses (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Accounts payable and accrued expenses [Abstract]
Accounts payable	$ 8,883	$ 3,565
Accrued interest	3,026	2,942
Accrued voyage expenses	2,274	224
Accrued employee compensation	2,566	4,812
Other	679	835
Total accounts payable and accrued expenses	$ 17,427	$ 12,378

The amount of expenses that the entity does not separately disclose in the same statement or note when the entity uses the 'nature of expense' form for its analysis of expenses. [Refer: Expenses, by nature]

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