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Transactions with Related Parties - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Related Party Transaction      
Vessel operating expenses $ 4,221 $ 4,466 $ 4,330
General and administrative expenses 5,713 6,236 6,253
Executive services agreement with CGP      
Related Party Transaction      
General and administrative expenses 1,688 1,688 1,688
Capital Ship Management Corp. | Floating fee management agreement      
Related Party Transaction      
Vessel operating expenses $ 4,221 $ 4,466 $ 4,330