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Fair values (Table) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Disclosure of fair value measurement of assets [Line Items]    
Derivative financial instruments $ 484 $ 831
Long -term borrowings 38,555 37,163
Financial liabilities 39,989 37,030
Financial liabilities measured at fair value    
Disclosure of fair value measurement of assets [Line Items]    
Financial liabilities at fair value 2,839 831
Derivative financial instruments 2,839 831
Financial liabilities not measured at fair value    
Disclosure of fair value measurement of assets [Line Items]    
Long -term borrowings 38,555 37,163
Financial liabilities 38,555 37,163
Level 2 | Financial liabilities not measured at fair value    
Disclosure of fair value measurement of assets [Line Items]    
Financial liabilities 39,989 37,030
Level 3 | Financial liabilities measured at fair value    
Disclosure of fair value measurement of assets [Line Items]    
Derivative financial instruments $ 2,839 $ 831