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Advances for vessels under construction and acquisition of vessels (Details) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 28, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items]
Advances for vessels under construction and acquisition of vessels	$ 46,480		$ 48,574
Newbuilding Newcastlemax dry bulk vessels
Property, Plant and Equipment [Line Items]
Number of contracts for Newbuildings acquired		3
Number of shares issued as part of the final consideration | shares		3,304,735
Share market price | $ / shares		$ 13
Description of Capital leases, Term of contract	ten-year bareboat charter
Capital leased assets, Number of vessels		3
Newbuilding Newcastlemax dry bulk vessels | Financed by CSSC
Property, Plant and Equipment [Line Items]
Capital lease obligation recognised		$ 104,400
Capital expenditure not yet paid		103,844
Newbuilding Newcastlemax dry bulk vessels | Financed by CSSC | Per OCC vessel
Property, Plant and Equipment [Line Items]
Vessel purchase price obligation		10,440
Capital lease obligation recognised		$ 34,800
Songa and Augustea vessels
Property, Plant and Equipment [Line Items]
Advances for vessels under construction and acquisition of vessels	$ 1,997

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The number of newbuildings contracts acquired.

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Purchase price payable at the end of the bareboat charter.

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Future cash outflow to pay for construction in progress expenditures that have occurred.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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A general description of the lessee's leasing arrangements including, but not limited to, the following: a) the basis on which contingent rental payments are determined; (b) the existence and terms of renewal or purchase options and escalation clauses; (c) restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing.

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Amount of lessee's undiscounted obligation for lease payments for finance lease.

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