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Voyage and Vessel operating expenses - Voyage expenses (Table) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Voyage And Vessel Operating Expenses
Port charges	$ 55,738	$ 63,576	$ 37,215
Bunkers	130,800	146,089	72,287
Commissions – third parties	6,134	6,828	6,179
Commissions – related parties (Note 3)	3,780	3,850	3,400
Miscellaneous	3,606	2,619	2,515
Total voyage expenses	$ 200,058	$ 222,962	$ 121,596

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Amounts charged by port authorities for the use of infrastructure.

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

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

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

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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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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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