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Income tax - Schedule of Components of Distributable Earnings (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Accumulated capital gains | $ (8,190) | $ (3,102) | $ 43,005
Unrealized appreciation (depreciation) | 33,029 | (44,592) | 40,655
Total distributable earnings | 140,013 | 59,909 | 216,523
Other temporary differences |  |  |
Total distributable earnings | (18,609) | (20,100) | (16,206)
Undistributed ordinary income |  |  |
Total distributable earnings | $ 133,783 | $ 127,703 | $ 149,069

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