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General information and significant accounting policies - Vessels and drydock (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 USD ($) vessel | Dec. 31, 2021 USD ($)
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Estimated useful lives | 25 years |  |
Impairment loss recognised in profit or loss, goodwill |  |  | $ 14,200
Vessels |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Estimated useful lives | 25 years |  |
Average scrap market rates period | 4 years |  |
Vessels | MR |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Reversal of impairment loss recognised in profit or loss |  | $ 12,700 |
Number of vessels with fair value less than carrying value | vessel |  | 13 |
Vessels | Bottom of range |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Period for scheduled repairs and maintenance | 30 months |  |
Vessels | Top of range |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |
Period for scheduled repairs and maintenance | 60 months |  |

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