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Financial risk management objectives and policies - Foreign currency risk (Table) (Details) - Currency risk - USD ($) $ in Thousands | 12 Months Ended
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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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- 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. + References No definition available. + Details
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