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Financial risk management objectives and policies - Foreign currency risk (Table) (Details) - Currency risk - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of risk management strategy related to hedge accounting [line items]
Increase in Euro exchange rate	10.00%	10.00%
Decrease in Euro exchange rate	(10.00%)	(10.00%)
Effect on loss (Decrease in Euro exchange rate)	$ 251	$ 254
Effect on loss (Increase in Euro exchange rate)	$ (251)	$ (254)

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Decrease in market exchange rates expressed as a percentage.

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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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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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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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