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Financial risk management objectives and policies - Interest rate risk (Table) (Details) - Interest rate risk $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Disclosure of risk management strategy related to hedge accounting [line items]
Increase in Libor	15	15
Decrease in Libor	(20)	(20)
Effect on loss (Decrease in Libor)	$ 80	$ 86
Effect on loss (Increase in Libor)	$ (60)	$ (69)

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- Definition

Decrease in market interest rates expressed in basis points. One basis point is equivalent to one hundredth of a percent.

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- Definition

Increase in market interest rates expressed in basis points. One basis point is equivalent to one hundredth of a percent.

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- Definition

Amount of the negative effect on profit or loss as a result of the conduct of a sensitivity analysis for types of market risk to which the entity is exposed, showing how profit or loss would have been affected by changes in the relevant risk variable that were reasonably possible at that date.

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- Definition

Amount of the positive effect on profit or loss as a result of the conduct of a sensitivity analysis for types of market risk to which the entity is exposed, showing how profit or loss would have been affected by changes in the relevant risk variable that were reasonably possible at that date.

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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