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Business and segmental reporting - Companys revenue contribution (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) segment item	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Business and segmental reporting
Revenues	$ 405,784	$ 395,978	$ 445,741
Number of reportable segments | segment	1
Number Of Vessels Employed | item	19
Spot Charters [Member]
Business and segmental reporting
Revenues	$ 392,107	395,577	437,189
Time charters [Member]
Business and segmental reporting
Revenues	13,635		7,917
Pooling Arrangements [Member]
Business and segmental reporting
Revenues			3
Other revenue [Member]
Business and segmental reporting
Revenues	$ 42	$ 401	$ 632

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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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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