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Tangible fixed assets - Impairment (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jun. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) item | Dec. 31, 2021 USD ($)
Tangible fixed assets |  |  |
Loss on sale of vessels |  | $ 171 | $ (630)
Tangible fixed assets |  | $ 1,677,771 | $ 1,888,583
Discount rate applied to cash flow projections |  | 8.40% | 7.50%
Steam vessels |  |  |
Tangible fixed assets |  |  |
Number of vessels for which value in use is lower than carrying amount | item |  | 2 |
Number of vessels | item |  | 3 |
Impairment loss |  | $ (4,444) |
Impairment reversal resulting from potential increase in re-chartering rate |  | (22,034) |
Impairment loss resulting from potential decrease in re-chartering rate |  | $ 14,027 |
Discount rate applied to cash flow projections |  | 8.40% | 7.50%
Percentage of increase or decrease in the discount rate for sensitivity analysis |  | 0.50% |
Impairment loss due to increase in discount rate |  | $ 2,927 |
Impairment reversal due to decrease in discount rate |  | (2,929) |
Steam vessels | Average |  |  |
Tangible fixed assets |  |  |
Charter market rate used (per day) |  | 35 | $ 35
Increase or decrease in re-chartering rate for sensitivity analysis |  | 5 |
Steam vessels impaired during current period |  |  |
Tangible fixed assets |  |  |
Impairment loss |  | (4,444) |
Tangible fixed assets |  | 130,400 |
Methane Jane Elizabeth |  |  |
Tangible fixed assets |  |  |
Impairment loss |  | (1,412) |
Tangible fixed assets |  | 65,408 |
Methane Alison Victoria |  |  |
Tangible fixed assets |  |  |
Impairment loss |  | (3,032) |
Tangible fixed assets |  | 64,992 |
Methane Shirley Elisabeth |  |  |
Tangible fixed assets |  |  |
Carrying amount reclassified as "Vessel held for sale" | $ 67,339 |  |
Impairment loss from remeasurement at lower of carrying amount and fair value less costs to sell | 14,664 |  |
Loss on sale of vessels |  | (166) |
Methane Heather Sally |  |  |
Tangible fixed assets |  |  |
Carrying amount reclassified as "Vessel held for sale" | 74,123 |  |
Impairment loss from remeasurement at lower of carrying amount and fair value less costs to sell | $ 13,363 |  |
Gain arising from sale and leaseback transactions |  | $ 337 |

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