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Discontinued Operations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property Plant And Equipment [Line Items]      
Vessel improvement costs capitalized $ 277    
Paid advances relating to the construction of exhaust gas cleaning systems and ballast water treatment systems 2,055 $ 0  
M/T Aristaios and M/T Anikitos      
Property Plant And Equipment [Line Items]      
Vessels cost 73,959    
Above market acquired charters acquisition 10,041    
Vessels part of the Crude and Product tanker business      
Property Plant And Equipment [Line Items]      
Vessel improvement costs capitalized 1,091 143 $ 511
Paid advances relating to the construction of exhaust gas cleaning systems and ballast water treatment systems $ 1,035 $ 0  
M/T Amor      
Property Plant And Equipment [Line Items]      
Vessels cost     31,600
Above market acquired charters acquisition     $ 1,061