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Fair Value Measurements (Reconciliation of Beginning and Ending Balances of Level 3 Measurements) (Details) - Level 3 - Convertible preferred securities - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Fair Value Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |  |
Convertible preferred securities | $ 18,190 | $ 15,625 | $ 14,190 | $ 15,625
Purchases of additional investments | $ 4,000 | $ 0 |  |

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