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Vessels, subsidiaries and other property, plant and equipment, Vessels (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Reconciliation of changes in property, plant and equipment [abstract]      
Reversal of impairment $ 27,909 $ 0 $ 0
Vessels 1,185,576 1,283,710  
Cost [Member]      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance, beginning of period 2,052,878 1,933,258  
Transferred to asset held for sale (68,421)    
Additions   94,743  
Transferred from vessel upgrades 6,624 33,917  
Disposals (8,339) (9,040)  
Balance, end of period 1,982,741 2,052,878 1,933,258
Accumulated Depreciation and Impairment [Member]      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance, beginning of period (769,168) (671,260)  
Charge for the period (109,974) (106,948)  
Reversal of impairment 27,909    
Transferred to asset held for sale 45,728    
Disposals 8,339 9,040  
Balance, end of period (797,165) (769,168) (671,260)
Vessel Upgrades [Member]      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance, beginning of period 10 4,583  
Additions 6,614 29,345  
Transferred to vessels (6,624) (33,917)  
Balance, end of period 0 10 4,583
Vessels Under Construction [Member]      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance, beginning of period 0    
Additions 93,178    
Balance, end of period 93,178 0  
Vessels [Member]      
Reconciliation of changes in property, plant and equipment [abstract]      
Vessels 1,155,127 1,239,435  
Vessels [Member] | Cost [Member]      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance, beginning of period 1,929,513 1,834,769  
Transferred to asset held for sale (62,829)    
Additions   94,743  
Transferred from vessel upgrades 0 0  
Disposals 0 0  
Balance, end of period 1,866,683 1,929,513 1,834,769
Vessels [Member] | Accumulated Depreciation and Impairment [Member]      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance, beginning of period (690,077) (602,390)  
Charge for the period (90,590) (87,688)  
Reversal of impairment 27,909    
Transferred to asset held for sale 41,203    
Disposals 0 0  
Balance, end of period (711,556) (690,077) (602,390)
Vessels [Member] | Vessel Upgrades [Member]      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance, beginning of period 0 0  
Additions 0 0  
Transferred to vessels 0 0  
Balance, end of period 0 0 0
Vessels [Member] | Vessels Under Construction [Member]      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance, beginning of period 0    
Additions 93,178    
Balance, end of period 93,178 0  
Drydock [Member]      
Reconciliation of changes in property, plant and equipment [abstract]      
Vessels 21,111 26,201  
Drydock [Member] | Cost [Member]      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance, beginning of period 48,736 46,617  
Transferred to asset held for sale (1,756)    
Additions   0  
Transferred from vessel upgrades 6,624 11,159  
Disposals (8,339) (9,040)  
Balance, end of period 45,264 48,736 46,617
Drydock [Member] | Accumulated Depreciation and Impairment [Member]      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance, beginning of period (22,535) (20,792)  
Charge for the period (10,647) (10,784)  
Reversal of impairment 0    
Transferred to asset held for sale 690    
Disposals 8,339 9,040  
Balance, end of period (24,153) (22,535) (20,792)
Drydock [Member] | Vessel Upgrades [Member]      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance, beginning of period 10 2,807  
Additions 6,614 8,362  
Transferred to vessels (6,624) (11,159)  
Balance, end of period 0 10 2,807
Drydock [Member] | Vessels Under Construction [Member]      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance, beginning of period 0    
Additions 0    
Balance, end of period 0 0  
EGCS [Member]      
Reconciliation of changes in property, plant and equipment [abstract]      
Vessels [1] 9,338 18,074  
EGCS [Member] | Cost [Member]      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance, beginning of period [1] 74,630 51,871  
Transferred to asset held for sale [1] (3,836)    
Additions [1]   0  
Transferred from vessel upgrades [1] 0 22,758  
Disposals [1] 0 0  
Balance, end of period [1] 70,794 74,630 51,871
EGCS [Member] | Accumulated Depreciation and Impairment [Member]      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance, beginning of period [1] (56,556) (48,079)  
Charge for the period [1] (8,736) (8,477)  
Reversal of impairment [1] 0    
Transferred to asset held for sale [1] 3,836    
Disposals [1] 0 0  
Balance, end of period [1] (61,456) (56,556) (48,079)
EGCS [Member] | Vessel Upgrades [Member]      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance, beginning of period [1] 0 1,776  
Additions [1] 0 20,983  
Transferred to vessels [1] 0 (22,758)  
Balance, end of period [1] 0 0 $ 1,776
EGCS [Member] | Vessels Under Construction [Member]      
Reconciliation of changes in property, plant and equipment [abstract]      
Balance, beginning of period [1] 0    
Additions [1] 0    
Balance, end of period [1] $ 0 $ 0  
[1] Exhaust Gas Cleaning Systems (“EGCS”).