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Above market acquired charters - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 4 Months Ended 12 Months Ended
Jan. 17, 2018
May 04, 2018
Dec. 31, 2018
Acquired Finite Lived Intangible Assets [Line Items]      
Above market acquired charters acquisition     $ 10,041
M/T Anikitos      
Acquired Finite Lived Intangible Assets [Line Items]      
Above market acquired charters acquisition   $ 496  
M/T Aristaios      
Acquired Finite Lived Intangible Assets [Line Items]      
Above market acquired charters acquisition $ 9,545