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Interest expense and finance costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Interest expense and finance costs
Interest incurred - debt	$ 4,140	$ 8,033	$ 6,245
Interest incurred - finance leases	1,500	3,718	11,239
Amortization of deferred finance fees	1,138	1,237	1,461
Interest rate swaps		(1,580)	(3,408)
Interest expense and finance costs	6,778	$ 11,408	15,537
Gain / (loss) on extinguishment	$ (1,432)		$ 1,576

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The amount of SWAP interest expense incurred during the period.

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Amount of amortization expense attributable to debt issuance costs.

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Amount of interest expense on finance lease liability.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount of interest expense classified as operating and nonoperating. Includes, but is not limited to, cost of borrowing accounted for as interest expense.

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