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Transactions with Related Parties - Statements of Operations (Table) (Details) - USD ($) $ in Thousands | 12 Months Ended
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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)

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- Definition The fees related to receiving management consultancy services during the reporting period. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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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. + Details
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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. + Details
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Period Type: | duration

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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. + Details
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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 + Details
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- Definition 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 No definition available. + Details
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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. + References No definition available. + Details
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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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