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Interest expense and finance costs (Details) - USD ($) $ in Thousands | 12 Months Ended
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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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