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Long-Term Debt, net - Annual Loan Principal Payments (Table) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]    
Loan Balance $ 41,660 $ 65,778
HSH Bank    
Disclosure of detailed information about borrowings [line items]    
Loan Balance 24,937 25,936
DVB Bank | Tranche (A)    
Disclosure of detailed information about borrowings [line items]    
Loan Balance 8,380 9,700
DVB Bank | Tranche (B)    
Disclosure of detailed information about borrowings [line items]    
Loan Balance 8,343 9,592
Firment Trading Limited    
Disclosure of detailed information about borrowings [line items]    
Loan Balance   17,435
Silaner Investments Limited    
Disclosure of detailed information about borrowings [line items]    
Loan Balance   3,115
Not later than one year    
Disclosure of detailed information about borrowings [line items]    
Loan Balance 12,403 23,634
Not later than one year | HSH Bank    
Disclosure of detailed information about borrowings [line items]    
Loan Balance 2,774 2,774
Not later than one year | DVB Bank | Tranche (A)    
Disclosure of detailed information about borrowings [line items]    
Loan Balance 8,380 1,760
Not later than one year | DVB Bank | Tranche (B)    
Disclosure of detailed information about borrowings [line items]    
Loan Balance 1,249 1,665
Not later than one year | Firment Trading Limited    
Disclosure of detailed information about borrowings [line items]    
Loan Balance   17,435
Not later than one year | Silaner Investments Limited    
Disclosure of detailed information about borrowings [line items]    
Loan Balance   0
Later than one year and not later than two years    
Disclosure of detailed information about borrowings [line items]    
Loan Balance 29,257 15,494
Later than one year and not later than two years | HSH Bank    
Disclosure of detailed information about borrowings [line items]    
Loan Balance 22,163 2,774
Later than one year and not later than two years | DVB Bank | Tranche (A)    
Disclosure of detailed information about borrowings [line items]    
Loan Balance 0 7,940
Later than one year and not later than two years | DVB Bank | Tranche (B)    
Disclosure of detailed information about borrowings [line items]    
Loan Balance 7,094 1,665
Later than one year and not later than two years | Firment Trading Limited    
Disclosure of detailed information about borrowings [line items]    
Loan Balance   0
Later than one year and not later than two years | Silaner Investments Limited    
Disclosure of detailed information about borrowings [line items]    
Loan Balance   3,115
Later than two years and not later than three years    
Disclosure of detailed information about borrowings [line items]    
Loan Balance   26,650
Later than two years and not later than three years | HSH Bank    
Disclosure of detailed information about borrowings [line items]    
Loan Balance   20,388
Later than two years and not later than three years | DVB Bank | Tranche (A)    
Disclosure of detailed information about borrowings [line items]    
Loan Balance   0
Later than two years and not later than three years | DVB Bank | Tranche (B)    
Disclosure of detailed information about borrowings [line items]    
Loan Balance   6,262
Later than two years and not later than three years | Firment Trading Limited    
Disclosure of detailed information about borrowings [line items]    
Loan Balance   0
Later than two years and not later than three years | Silaner Investments Limited    
Disclosure of detailed information about borrowings [line items]    
Loan Balance   0
Later than two years    
Disclosure of detailed information about borrowings [line items]    
Loan Balance 0  
Later than two years | HSH Bank    
Disclosure of detailed information about borrowings [line items]    
Loan Balance 0  
Later than two years | DVB Bank | Tranche (A)    
Disclosure of detailed information about borrowings [line items]    
Loan Balance 0  
Later than two years | DVB Bank | Tranche (B)    
Disclosure of detailed information about borrowings [line items]    
Loan Balance $ 0  
Later than three years    
Disclosure of detailed information about borrowings [line items]    
Loan Balance   0
Later than three years | HSH Bank    
Disclosure of detailed information about borrowings [line items]    
Loan Balance   0
Later than three years | DVB Bank | Tranche (A)    
Disclosure of detailed information about borrowings [line items]    
Loan Balance   0
Later than three years | DVB Bank | Tranche (B)    
Disclosure of detailed information about borrowings [line items]    
Loan Balance   0
Later than three years | Firment Trading Limited    
Disclosure of detailed information about borrowings [line items]    
Loan Balance   0
Later than three years | Silaner Investments Limited    
Disclosure of detailed information about borrowings [line items]    
Loan Balance   $ 0