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Fair values (Table) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of fair value measurement of assets [line items]    
Long term borrowings $ 41,219 $ 62,831
Level 2    
Disclosure of fair value measurement of assets [line items]    
Long term borrowings $ 41,219 $ 62,831