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Vessels in Operation - Schedule of Vessels in Operation (Table) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Balance $ 586,520    
Additions 11,675    
Acquisitions through the Poseidon Transaction 617,522    
Depreciation (31,117)    
Impairment loss (71,834) $ (87,624) $ (92,422)
Balance 1,112,766 586,520  
Vessel Cost, as adjusted for impairment charges [Member]      
Property, Plant and Equipment [Line Items]      
Balance 734,534 916,809  
Additions 11,675 310  
Acquisitions through the Poseidon Transaction 617,522    
Impairment loss (139,354) (182,585)  
Balance 1,224,377 734,534 916,809
Accumulated Depreciation [Member]      
Property, Plant and Equipment [Line Items]      
Balance (148,014) (209,481)  
Depreciation (31,117) (33,494)  
Impairment loss 67,520 94,961  
Balance (111,611) (148,014) (209,481)
Net Book Value [Member]      
Property, Plant and Equipment [Line Items]      
Balance 586,520 707,328  
Additions 11,675 310  
Acquisitions through the Poseidon Transaction 617,522    
Depreciation (31,117) (33,494)  
Impairment loss (71,834) (87,624)  
Balance $ 1,112,766 $ 586,520 $ 707,328