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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”).

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