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Basis of Presentation and General Information, textuals (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
item
shares
Dec. 11, 2007
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General Information    
Entity Incorporation, Date of Incorporation Dec. 11, 2007  
Entity Incorporation, State Country Name Republic of the Marshall Islands  
Percentage Of Ownership In Subsidiaries   100.00%
Number of subsidiaries owned by the entity 46 19
Number of drybulk vessels 37  
Number Of Newbuild Vessels 2  
Number of additional public common stock offerings 5  
Number of additional public preferred stock offerings 3  
Cumulative redeemable perpetual preferred equity | $ $ 16,900  
Private Placement | Series A Preferred Stock    
Pinewood transaction [Line Items]    
Number of shares issued in transaction | shares 100