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Voyage and Vessel operating expenses - Voyage expenses (Table) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Expenses
Port charges	$ 37,215	$ 21,060	$ 30,229
Bunkers	72,287	34,997	28,121
Commissions - third parties	6,179	3,438	2,506
Commissions - related parties (Note 3)	3,400	3,300	3,300
Miscellaneous	2,515	1,887	1,665
Total voyage expenses	$ 121,596	$ 64,682	$ 65,821

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- Definition

Amounts charged by port authorities for the use of infrastructure.

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- Definition

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

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- Definition

Fuel costs incurred that are directly related to goods produced and sold and services rendered during the reporting period.

+ 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 210.5-03.2(a),(d))
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- Definition

Other costs incurred during the reporting period related to other revenue generating activities.

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-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
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- Definition

Direct costs arising from transactions with related parties who are not affiliates or joint Ventures. These costs are categorized as cost of goods sold.

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-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
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Primarily represents commissions incurred in the period based upon the sale by commissioned employees or third parties of the entity's goods or services, and fees for sales assistance or product enhancements performed by third parties (such as a distributor or value added reseller).

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