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Loss on sale of vessels (Details)
$ in Thousands
12 Months Ended
Mar. 15, 2022
USD ($)
Feb. 28, 2022
USD ($)
Sep. 01, 2021
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Vessel
Dec. 31, 2020
USD ($)
Jun. 30, 2021
USD ($)
Gross Proceeds and Sale of Vessels [Abstract]              
Net proceeds from vessel sales       $ 71,714 $ 35,886 $ 310,016  
Maintenance deposits       2,000 2,000    
Gain (loss) on sale of vessels       78 0 (12,355)  
Carrying amount       418,272 224,977    
Impairment charge       0 1,160 0  
Proceeds from sale of vessel       71,714 35,886 310,016  
Vessels [Member]              
Gross Proceeds and Sale of Vessels [Abstract]              
Selling price (gross)           322,868  
Net proceeds from vessel sales           310,016  
Vessels, selling expense           10,852  
Maintenance deposits           2,000  
Gain (loss) on sale of vessels           (12,355)  
Carrying amount       389,059 156,585 136,292  
Proceeds from sale of vessel           $ 310,016  
M/T Stenaweco Energy [Member]              
Gross Proceeds and Sale of Vessels [Abstract]              
Date sold           Oct. 29, 2020  
Selling price (gross)           $ 25,150  
M/T Stenaweco Evolution [Member]              
Gross Proceeds and Sale of Vessels [Abstract]              
Date sold           Nov. 03, 2020  
Selling price (gross)           $ 26,150  
M/T EcoFleet [Member]              
Gross Proceeds and Sale of Vessels [Abstract]              
Date sold           Jan. 21, 2020  
Selling price (gross)           $ 21,000  
M/T Eco Revolution [Member]              
Gross Proceeds and Sale of Vessels [Abstract]              
Date sold           Jan. 14, 2020  
Selling price (gross)           $ 23,000  
M/T SW Excellence [Member]              
Gross Proceeds and Sale of Vessels [Abstract]              
Date sold           Oct. 14, 2020  
Selling price (gross)           $ 27,008  
M/T Stenaweco Elegance [Member]              
Gross Proceeds and Sale of Vessels [Abstract]              
Date sold           Feb. 21, 2020  
Selling price (gross)           $ 33,500  
M/T Eco Palm Desert [Member]              
Gross Proceeds and Sale of Vessels [Abstract]              
Date sold           Mar. 19, 2020  
Selling price (gross)           $ 34,800  
M/T Eco California [Member]              
Gross Proceeds and Sale of Vessels [Abstract]              
Date sold           Nov. 09, 2020  
Selling price (gross)           $ 30,600  
M/T Eco Bel Air [Member]              
Gross Proceeds and Sale of Vessels [Abstract]              
Date sold           Dec. 10, 2020  
Selling price (gross)           $ 50,830  
Maintenance deposits           $ 1,000  
M/T Eco Beverly Hills [Member]              
Gross Proceeds and Sale of Vessels [Abstract]              
Date sold           Dec. 01, 2020  
Selling price (gross)           $ 50,830  
Maintenance deposits           $ 1,000  
M/T Nord Valiant [Member]              
Gross Proceeds and Sale of Vessels [Abstract]              
Net proceeds from vessel sales     $ 25,887        
Carrying amount             $ 27,047
Fair value         25,887    
Impairment charge         1,160    
Proceeds from sale of vessel     $ 25,887        
M/T Eco Los Angeles [Member]              
Gross Proceeds and Sale of Vessels [Abstract]              
Net proceeds from vessel sales   $ 18,640          
Proceeds from sale of vessel   $ 18,640          
Vessels held for sale         35,818    
M/T Eco City of Angels [Member]              
Gross Proceeds and Sale of Vessels [Abstract]              
Net proceeds from vessel sales $ 18,640            
Proceeds from sale of vessel $ 18,640            
Vessels held for sale         35,818    
M/T Eco Los Angeles and M/T Eco City [Member]              
Gross Proceeds and Sale of Vessels [Abstract]              
Gain (loss) on sale of vessels       $ 78      
Impairment charge         $ 0    
Number of vessels classified as held for sale | Vessel         2    
Vessels held for sale         $ 35,818