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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 $ 1,265,196    
Acquisitions and improvements 75,327    
Disposals (10,927)    
Depreciation for the period (71,009)    
Impairment of vessel (28,805) $ (3,282) $ 0
Balance as at end of period 1,229,782 1,265,196  
Vessel Cost      
Property Plant And Equipment      
Balance as at beginning of period 1,738,515 1,775,689  
Acquisitions and improvements 75,327 967  
Disposals (10,927)    
Impairment of vessel (78,607) (9,279)  
Classification as asset held for sale   (28,862)  
Balance as at end of period 1,724,308 1,738,515 1,775,689
Accumulated depreciation      
Property Plant And Equipment      
Balance as at beginning of period (473,319) (407,958)  
Depreciation for the period (71,009) (71,358)  
Impairment of vessel 49,802 5,997  
Balance as at end of period (494,526) (473,319) (407,958)
Net book value      
Property Plant And Equipment      
Balance as at beginning of period 1,265,196 1,367,731  
Acquisitions and improvements 75,327 967  
Disposals (10,927)    
Depreciation for the period (71,009) (71,358)  
Impairment of vessel (28,805) (3,282)  
Classification as asset held for sale   (28,862)  
Balance as at end of period $ 1,229,782 $ 1,265,196 $ 1,367,731