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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”).

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