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Vessels, subsidiaries and other property, plant and equipment, Vessels (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Reconciliation of changes in property, plant and equipment [abstract]        
Reversal of impairment $ 27,909 $ 0 $ 27,909 $ 0
Vessels 1,185,576 1,083,891 1,185,576  
Cost [Member]        
Reconciliation of changes in property, plant and equipment [abstract]        
Balance, beginning of period   1,982,741 2,052,878  
Transferred to assets held for sale   (147,411) (68,421)  
Additions   111,270    
Transferred from vessel upgrades     6,624  
Disposals   (134,065) (8,339)  
Balance, end of period 1,982,741 1,812,535 1,982,741 2,052,878
Accumulated Depreciation and Impairment [Member]        
Reconciliation of changes in property, plant and equipment [abstract]        
Balance, beginning of period   (797,165) (769,168)  
Charge for the period   (104,583) (109,974)  
Reversal of impairment     27,909  
Transferred to assets held for sale   106,923 45,728  
Disposals   66,181 8,339  
Balance, end of period (797,165) (728,644) (797,165) (769,168)
Vessel Upgrades [Member]        
Reconciliation of changes in property, plant and equipment [abstract]        
Balance, beginning of period   0 10  
Additions     6,614  
Transferred to vessels     (6,624)  
Balance, end of period 0   0 10
Vessels Under Construction [Member]        
Reconciliation of changes in property, plant and equipment [abstract]        
Balance, beginning of period   93,178 0  
Additions   208,474 93,178  
Balance, end of period 93,178 301,651 93,178 0
Vessels [Member]        
Reconciliation of changes in property, plant and equipment [abstract]        
Vessels 1,155,127 1,067,103 1,155,127  
Vessels [Member] | Cost [Member]        
Reconciliation of changes in property, plant and equipment [abstract]        
Balance, beginning of period   1,866,683 1,929,513  
Transferred to assets held for sale   (135,611) (62,829)  
Additions   105,459    
Transferred from vessel upgrades     0  
Disposals   (118,348) 0  
Balance, end of period 1,866,683 1,718,183 1,866,683 1,929,513
Vessels [Member] | Accumulated Depreciation and Impairment [Member]        
Reconciliation of changes in property, plant and equipment [abstract]        
Balance, beginning of period   (711,556) (690,077)  
Charge for the period   (87,633) (90,590)  
Reversal of impairment     27,909  
Transferred to assets held for sale   96,816 41,203  
Disposals   51,293 0  
Balance, end of period (711,556) (651,080) (711,556) (690,077)
Vessels [Member] | Vessel Upgrades [Member]        
Reconciliation of changes in property, plant and equipment [abstract]        
Balance, beginning of period   0 0  
Additions     0  
Transferred to vessels     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   93,178 0  
Additions   208,474 93,178  
Balance, end of period 93,178 301,651 93,178 0
Drydock [Member]        
Reconciliation of changes in property, plant and equipment [abstract]        
Vessels 21,111 15,056 21,111  
Drydock [Member] | Cost [Member]        
Reconciliation of changes in property, plant and equipment [abstract]        
Balance, beginning of period   45,264 48,736  
Transferred to assets held for sale   (3,630) (1,756)  
Additions   5,811    
Transferred from vessel upgrades     6,624  
Disposals   (8,203) (8,339)  
Balance, end of period 45,264 39,242 45,264 48,736
Drydock [Member] | Accumulated Depreciation and Impairment [Member]        
Reconciliation of changes in property, plant and equipment [abstract]        
Balance, beginning of period   (24,153) (22,535)  
Charge for the period   (9,344) (10,647)  
Reversal of impairment     0  
Transferred to assets held for sale   1,937 690  
Disposals   7,374 8,339  
Balance, end of period (24,153) (24,186) (24,153) (22,535)
Drydock [Member] | Vessel Upgrades [Member]        
Reconciliation of changes in property, plant and equipment [abstract]        
Balance, beginning of period   0 10  
Additions     6,614  
Transferred to vessels     (6,624)  
Balance, end of period 0   0 10
Drydock [Member] | Vessels Under Construction [Member]        
Reconciliation of changes in property, plant and equipment [abstract]        
Balance, beginning of period   0 0  
Additions   0 0  
Balance, end of period 0 0 0 0
EGCS [Member]        
Reconciliation of changes in property, plant and equipment [abstract]        
Vessels [1] 9,338 1,732 9,338  
EGCS [Member] | Cost [Member]        
Reconciliation of changes in property, plant and equipment [abstract]        
Balance, beginning of period [1]   70,794 74,630  
Transferred to assets held for sale [1]   (8,169) (3,836)  
Additions [1]   0    
Transferred from vessel upgrades [1]     0  
Disposals [1]   (7,515) 0  
Balance, end of period [1] 70,794 55,110 70,794 74,630
EGCS [Member] | Accumulated Depreciation and Impairment [Member]        
Reconciliation of changes in property, plant and equipment [abstract]        
Balance, beginning of period [1]   (61,456) (56,556)  
Charge for the period [1]   (7,606) (8,736)  
Reversal of impairment [1]     0  
Transferred to assets held for sale [1]   8,169 3,836  
Disposals [1]   7,515 0  
Balance, end of period [1] (61,456) (53,378) (61,456) (56,556)
EGCS [Member] | Vessel Upgrades [Member]        
Reconciliation of changes in property, plant and equipment [abstract]        
Balance, beginning of period [1]   0 0  
Additions [1]     0  
Transferred to vessels [1]     0  
Balance, end of period [1] 0   0 0
EGCS [Member] | Vessels Under Construction [Member]        
Reconciliation of changes in property, plant and equipment [abstract]        
Balance, beginning of period [1]   0 0  
Additions [1]   0 0  
Balance, end of period [1] $ 0 $ 0 $ 0 $ 0
[1] Exhaust Gas Cleaning Systems (“EGCS”).