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Significant accounting policy - Concentration of credit risk (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Significant accounting policies
Revenues	$ 405,784	$ 395,978	$ 445,741
Charterer A [Member]
Significant accounting policies
Revenues	$ 28,132		55,626
Charterer B [Member]
Significant accounting policies
Revenues			$ 53,345

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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