Transactions with Related Parties - Statements of Operations (Table) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Office rent	$ (92,896)	$ (5,325)	$ (3,550)
Voyage expenses	(121,596)	(64,682)	(65,821)
Management fees	(11,321)	(7,543)	(7,604)
Voyage revenues	651,561	331,976	221,987
General and administrative expenses	(33,972)	(30,955)	(24,602)
Interchart (a)
Related Party Transaction [Line Items]
Voyage expenses	(3,400)	(3,300)	(3,300)
Executive officers (b)
Related Party Transaction [Line Items]
Consultancy fees	(534)	(493)	(496)
Directors (b)
Related Party Transaction [Line Items]
Directors compensation	(159)	(145)	(148)
Combine Marine Ltd. and Alma Properties (c)
Related Party Transaction [Line Items]
Office rent	(41)	(39)	(34)
Sydelle Marine Limited (h) \| Profit sharing agreement
Related Party Transaction [Line Items]
Voyage revenues	(875)	(329)	0
Augustea Technoservices Ltd. (f)
Related Party Transaction [Line Items]
Management fees	(2,309)	0	0
Songa Shipmanagement Ltd. (g)
Related Party Transaction [Line Items]
Management fees	(376)	0	0
Oceanbulk Maritime S.A. and its affiliates (d)
Related Party Transaction [Line Items]
General and administrative expenses	$ (322)	$ (284)	$ (270)

The fees related to receiving management consultancy services during the reporting period.

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- Definition

Expenditures for compensation for non executive officers.Examples include, but not limited to, Board of Director's attendance fees.

+ References

No definition available.

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- Definition

Costs relating to the voyages performed by the vessels and may include port, canal, bunker expenses, commissions and other.

+ References

No definition available.

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- Definition

Revenues arising from services provided to charterers according to the terms and conditions included in charter agreements. Voyage revenues may include the amortization of above/below market acquired time charter.

+ References

No definition available.

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- Definition

The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

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- Definition

Professional and contract service expense includes cost reimbursements for support services related to contracted projects, outsourced management, technical and staff support.

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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.

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