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Carrying values of vessels, vessels under construction, right of use assets for vessels and goodwill - Carrying value of vessels narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
vessel
Dec. 31, 2022
USD ($)
vessel
Dec. 31, 2020
USD ($)
vessel
Dec. 31, 2021
vessel
Disclosure of impairment loss and reversal of impairment loss [line items]        
Number of vessels | vessel 1      
Reversal of previously recorded impairment   $ 12,708    
Vessels estimated useful life 25 years      
Goodwill $ 8,197 $ 8,197    
Vessels        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Number of vessels | vessel 111 113    
MR | Vessels        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Number of vessels | vessel     13 13
Impairment loss recognised in profit or loss, property, plant and equipment     $ 14,200  
Reversal of previously recorded impairment   $ 12,700    
Approximate age of vessels previously impaired 10 years