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Cash and cash equivalents and Restricted cash (Table) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Cash and cash equivalents [abstract]        
Cash on hand $ 6 $ 46    
Cash at banks 2,703 0    
Total $ 2,709 $ 46 $ 1,588 $ 2,756