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Investments - Marketable equity securities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024
Investments |  |  |
Fair value, beginning balance |  |  | $ 134,265
Net losses on marketable securities |  | $ (57,095) |
Sales of marketable securities | $ (14,700) | (14,662) |
Fair value, ending balance | $ 62,508 | $ 62,508 | $ 134,265

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