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Tangible fixed assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Tangible fixed assets    
Balance, at the beginning of the year $ 1,888,583  
Balance, at the end of the year 1,677,771 $ 1,888,583
Cost    
Tangible fixed assets    
Balance, at the beginning of the year 2,685,184 2,876,548
Additions, net 3,358 13,443
Disposals   (190,295)
Transfer under Vessels held for sale (324,034)  
Fully amortized dry-docking component   (14,512)
Balance, at the end of the year 2,364,508 2,685,184
Accumulated depreciation and impairment loss    
Tangible fixed assets    
Balance, at the beginning of the year (796,601) (669,930)
Depreciation (68,264) (81,937)
Disposals   44,731
Impairment loss on vessels (4,444) (103,977)
Transfer under Vessels held for sale 182,572  
Fully amortized dry-docking component   14,512
Balance, at the end of the year (686,737) (796,601)
Vessels    
Tangible fixed assets    
Balance, at the beginning of the year 1,884,494  
Balance, at the end of the year 1,672,159 1,884,494
Vessels | Cost    
Tangible fixed assets    
Balance, at the beginning of the year 2,681,095 2,873,829
Additions, net 1,835 12,073
Disposals   (190,295)
Transfer under Vessels held for sale (324,034)  
Fully amortized dry-docking component   (14,512)
Balance, at the end of the year 2,358,896 2,681,095
Vessels | Accumulated depreciation and impairment loss    
Tangible fixed assets    
Balance, at the beginning of the year (796,601) (669,930)
Depreciation (68,264) (81,937)
Disposals   44,731
Impairment loss on vessels (4,444) (103,977)
Transfer under Vessels held for sale 182,572  
Fully amortized dry-docking component   14,512
Balance, at the end of the year (686,737) (796,601)
Other tangible assets    
Tangible fixed assets    
Balance, at the beginning of the year 4,089  
Balance, at the end of the year 5,612 4,089
Other tangible assets | Cost    
Tangible fixed assets    
Balance, at the beginning of the year 4,089 2,719
Additions, net 1,523 1,370
Balance, at the end of the year $ 5,612 $ 4,089