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Basis of Presentation and General Information - Vessels under construction (Table) (Details)
 12 Months Ended
Dec. 31, 2018
HN 1388 (tbn Katie K)  
Property, Plant and Equipment [Line Items]  
DWT 208,000 [1]
Expected Delivery Date Mar-19 [1]
HN 1389 (tbn Debbie H)  
Property, Plant and Equipment [Line Items]  
DWT 208,000 [1]
Expected Delivery Date Apr-19 [1]
HN 1390 (tbn Ocean Ayesha)  
Property, Plant and Equipment [Line Items]  
DWT 208,000 [1]
Expected Delivery Date Jun-19 [1]
Newbuilding Vessels  
Property, Plant and Equipment [Line Items]  
DWT 624,000
[1] Subject to a bareboat charter with purchase obligation at the expiration of the bareboat charter term (Note 6)