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Transactions with Related Parties - Compensation to the Company's non-executive directors (Table) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of transactions between related parties [line items]      
Share-based payments (note 13) $ 40 $ 50 $ 60
Non-executive directors      
Disclosure of transactions between related parties [line items]      
Director's remuneration 145 130 185
Share-based payments (note 13) 40 35 60
Total $ 185 $ 165 $ 245