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Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Investments |  |  |
Investments - Available-for-sale | $ 0 | $ 98,031 |
Available-for-sale investments |  |  |
Net unrealized gain (loss) on available-for-sale debt securities |  | $ 476 | $ (533)
Net realized gain (loss) on available-for-sale debt securities | $ 57 |  |

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