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Basis of Presentation and General Information - Charter Revenue Percentage (Table) (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Charterer A [Member]      
Policyholder Account Balance [Line Items]      
Concentration Risk, Percentage 11.00%    
Charterer B [Member]      
Policyholder Account Balance [Line Items]      
Concentration Risk, Percentage   13.00% 15.00%