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Prepaid Expenses and Other Current Assets (Table) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Prepaid Expense And Other Assets Current [Abstract]    
Inventories $ 6,696 $ 4,007
Advances for working capital purposes 8,750 8,250
Insurance claims 19,764 0
Voyage charters deferred contract costs and other 1,183 1,086
Total prepaid expenses and other current assets $ 36,393 $ 13,343