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Advances for vessels under construction and acquisition of vessels (Details) $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items]
Advances for vessels under construction and acquisition of vessels	$ 0	$ 59,900	$ 48,574
OCC vessels | Financed by CSSC
Property, Plant and Equipment [Line Items]
Capital leased assets, Number of vessels		3
OCC vessels | First OCC Vessel | Financed by CSSC
Property, Plant and Equipment [Line Items]
Capital lease obligation recognised		$ 4,350
OCC vessels | Second OCC Vessel | Financed by CSSC
Property, Plant and Equipment [Line Items]
Capital lease obligation recognised		4,350
Step 1 Acquisition
Property, Plant and Equipment [Line Items]
Advances for vessels under construction and acquisition of vessels		$ 4,880

X

- Definition

The number of units (items of property) under capital lease arrangements.

+ References

No definition available.

+ Details

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X

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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