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Advances for vessels under construction and acquisition of vessels (Details) $ in Thousands	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Vessels [Line Items]
Other current assets	$ 5,857	$ 6,447
Newbuilding Vessels or Lease Agreements
Vessels [Line Items]
Number of newbuilding contracts	3
Total aggregate remaining contracted price plus agreed additional amounts	$ 103,492
Capital Lease Obligations
Vessels [Line Items]
Number of newbuilding contracts	1
Refund receivable from the shipyards
Vessels [Line Items]
Other current assets	$ 1,604

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- Definition

The number of newbuildings contracts acquired.

+ References

No definition available.

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X

- Definition

The total amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation to be paid within and after one year from the balance sheet date.

+ References

No definition available.

+ Details

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X

- Definition

Amount of current assets classified as other.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.8)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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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- Details

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- Details

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