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General information and significant accounting policies - Vessels and drydock (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
USD ($)
vessel
Dec. 31, 2021
USD ($)
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives 25 years    
Impairment loss recognised in profit or loss, goodwill     $ 14,200
Vessels      
Disclosure of detailed information about property, plant and equipment [line items]      
Estimated useful lives 25 years    
Average scrap market rates period 4 years    
Vessels | MR      
Disclosure of detailed information about property, plant and equipment [line items]      
Reversal of impairment loss recognised in profit or loss   $ 12,700  
Number of vessels with fair value less than carrying value | vessel   13  
Vessels | Bottom of range      
Disclosure of detailed information about property, plant and equipment [line items]      
Period for scheduled repairs and maintenance 30 months    
Vessels | Top of range      
Disclosure of detailed information about property, plant and equipment [line items]      
Period for scheduled repairs and maintenance 60 months