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Fixed assets and assets held for sale - Vessels, net (Table) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property Plant And Equipment      
Balance as at beginning of period $ 1,367,731    
Impairment of vessel (3,282) $ 0 $ 0
Balance as at end of period 1,265,196 1,367,731  
Vessel Cost      
Property Plant And Equipment      
Balance as at beginning of period 1,775,689 1,653,727  
Acquisitions and improvements 967 103,790  
Transfer from Advances for vessels under construction - related party   18,172  
Impairment of vessel (3,282)    
Classification as asset held for sale (34,859)    
Balance as at end of period 1,738,515 1,775,689 1,653,727
Accumulated depreciation      
Property Plant And Equipment      
Balance as at beginning of period (407,958) (338,242)  
Depreciation for the period (71,358) (69,716)  
Classification as asset held for sale 5,997    
Balance as at end of period (473,319) (407,958) (338,242)
Net book value      
Property Plant And Equipment      
Balance as at beginning of period 1,367,731 1,315,485  
Acquisitions and improvements 967 103,790  
Transfer from Advances for vessels under construction - related party   18,172  
Depreciation for the period (71,358) (69,716)  
Impairment of vessel (3,282)    
Classification as asset held for sale (28,862)    
Balance as at end of period $ 1,265,196 $ 1,367,731 $ 1,315,485