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Vessels, net and assets held for sale - Vessels, net (Table) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property Plant And Equipment      
Balance as at beginning of period $ 657,668    
Ιmprovements 277    
Depreciation for the period (32,113)    
Impairment of vessels (28,805) $ (3,282) $ 0
Disposals (10,927)    
Balance as at end of period 586,100 657,668  
Vessel Cost      
Property Plant And Equipment      
Balance as at beginning of period 818,180 855,497  
Ιmprovements 277 824  
Impairment of vessels (78,607) (9,279)  
Disposals (10,927)    
Classification as asset held for sale   (28,862)  
Balance as at end of period 728,923 818,180 855,497
Accumulated depreciation      
Property Plant And Equipment      
Balance as at beginning of period (160,512) (131,591)  
Depreciation for the period (32,113) (34,918)  
Impairment of vessels 49,802 5,997  
Balance as at end of period (142,823) (160,512) (131,591)
Net book value      
Property Plant And Equipment      
Balance as at beginning of period 657,668 723,906  
Ιmprovements 277 824  
Depreciation for the period (32,113) (34,918)  
Impairment of vessels (28,805) (3,282)  
Disposals (10,927)    
Classification as asset held for sale   (28,862)  
Balance as at end of period $ 586,100 $ 657,668 $ 723,906