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Vessels, net (Table) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property Plant And Equipment      
Balance as at beginning of period $ 586,100    
Ιmprovements 19,896 $ 277  
Depreciation for the period (29,105)    
Impairment of vessels 0 (28,805) $ (3,282)
Disposals   (10,927)  
Balance as at end of period 576,891 586,100  
Vessel Cost      
Property Plant And Equipment      
Balance as at beginning of period 728,923 818,180  
Ιmprovements 19,896 277  
Impairment of vessels   (78,607)  
Disposals   (10,927)  
Balance as at end of period 748,819 728,923 818,180
Accumulated depreciation      
Property Plant And Equipment      
Balance as at beginning of period (142,823) (160,512)  
Depreciation for the period (29,105) (32,113)  
Impairment of vessels   49,802  
Balance as at end of period (171,928) (142,823) (160,512)
Net book value      
Property Plant And Equipment      
Balance as at beginning of period 586,100 657,668  
Ιmprovements 19,896 277  
Depreciation for the period (29,105) (32,113)  
Impairment of vessels   (28,805)  
Disposals   (10,927)  
Balance as at end of period $ 576,891 $ 586,100 $ 657,668