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Fair Value Measurements - Fair Value of Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Financial Assets |  |
Estimated Fair Value | $ 522,212 |
Corporate |  |
Financial Assets |  |
Estimated Fair Value | 213,964 |
U.S. Treasury |  |
Financial Assets |  |
Estimated Fair Value | 109,561 |
States and municipalities |  |
Financial Assets |  |
Estimated Fair Value | 39,929 |
Foreign |  |
Financial Assets |  |
Estimated Fair Value | 18,634 |
Asset-backed securities |  |
Financial Assets |  |
Estimated Fair Value | 25,767 |
Mortgage-backed securities |  |
Financial Assets |  |
Estimated Fair Value | 114,357 |
Fair Value, Recurring |  |
Financial Assets |  |
Total | 533,792 | $ 18,706
Liabilities, Fair Value Disclosure [Abstract] |  |
Total |  | 34,018
Fair Value, Recurring | Corporate |  |
Financial Assets |  |
Estimated Fair Value | 213,964 |
Fair Value, Recurring | U.S. Treasury |  |
Financial Assets |  |
Estimated Fair Value | 109,561 |
Fair Value, Recurring | States and municipalities |  |
Financial Assets |  |
Estimated Fair Value | 39,929 |
Fair Value, Recurring | Foreign |  |
Financial Assets |  |
Estimated Fair Value | 18,634 | 16,472
Fair Value, Recurring | Asset-backed securities |  |
Financial Assets |  |
Estimated Fair Value | 25,767 |
Fair Value, Recurring | Mortgage-backed securities |  |
Financial Assets |  |
Estimated Fair Value | 114,357 |
Fair Value, Recurring | Common stocks |  |
Financial Assets |  |
Estimated Fair Value | 11,580 |
Fair Value, Recurring | Public Warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Fair Value |  | 9,488
Fair Value, Recurring | Private Warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Fair Value |  | 476
Fair Value, Recurring | Underwriter Warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Fair Value |  | 53
Fair Value, Recurring | OTM Warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Fair Value |  | 3,981
Fair Value, Recurring | PIPE Warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Fair Value |  | 20,020
Fair Value, Recurring | Investments: |  |
Financial Assets |  |
Investments: |  | 2,234
Fair Value, Recurring | Level 1 |  |
Financial Assets |  |
Total | 11,580 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Total |  | 9,488
Fair Value, Recurring | Level 1 | Corporate |  |
Financial Assets |  |
Estimated Fair Value | 0 |
Fair Value, Recurring | Level 1 | U.S. Treasury |  |
Financial Assets |  |
Estimated Fair Value | 0 |
Fair Value, Recurring | Level 1 | States and municipalities |  |
Financial Assets |  |
Estimated Fair Value | 0 |
Fair Value, Recurring | Level 1 | Foreign |  |
Financial Assets |  |
Estimated Fair Value | 0 | 0
Fair Value, Recurring | Level 1 | Asset-backed securities |  |
Financial Assets |  |
Estimated Fair Value | 0 |
Fair Value, Recurring | Level 1 | Mortgage-backed securities |  |
Financial Assets |  |
Estimated Fair Value | 0 |
Fair Value, Recurring | Level 1 | Common stocks |  |
Financial Assets |  |
Estimated Fair Value | 11,580 |
Fair Value, Recurring | Level 1 | Public Warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Fair Value |  | 9,488
Fair Value, Recurring | Level 1 | Private Warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Fair Value |  | 0
Fair Value, Recurring | Level 1 | Underwriter Warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Fair Value |  | 0
Fair Value, Recurring | Level 1 | OTM Warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Fair Value |  | 0
Fair Value, Recurring | Level 1 | PIPE Warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Fair Value |  | 0
Fair Value, Recurring | Level 1 | Investments: |  |
Financial Assets |  |
Investments: |  | 0
Fair Value, Recurring | Level 2 |  |
Financial Assets |  |
Total | 522,212 | 18,706
Liabilities, Fair Value Disclosure [Abstract] |  |
Total |  | 0
Fair Value, Recurring | Level 2 | Corporate |  |
Financial Assets |  |
Estimated Fair Value | 213,964 |
Fair Value, Recurring | Level 2 | U.S. Treasury |  |
Financial Assets |  |
Estimated Fair Value | 109,561 |
Fair Value, Recurring | Level 2 | States and municipalities |  |
Financial Assets |  |
Estimated Fair Value | 39,929 |
Fair Value, Recurring | Level 2 | Foreign |  |
Financial Assets |  |
Estimated Fair Value | 18,634 | 16,472
Fair Value, Recurring | Level 2 | Asset-backed securities |  |
Financial Assets |  |
Estimated Fair Value | 25,767 |
Fair Value, Recurring | Level 2 | Mortgage-backed securities |  |
Financial Assets |  |
Estimated Fair Value | 114,357 |
Fair Value, Recurring | Level 2 | Common stocks |  |
Financial Assets |  |
Estimated Fair Value | 0 |
Fair Value, Recurring | Level 2 | Public Warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Fair Value |  | 0
Fair Value, Recurring | Level 2 | Private Warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Fair Value |  | 0
Fair Value, Recurring | Level 2 | Underwriter Warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Fair Value |  | 0
Fair Value, Recurring | Level 2 | OTM Warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Fair Value |  | 0
Fair Value, Recurring | Level 2 | PIPE Warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Fair Value |  | 0
Fair Value, Recurring | Level 2 | Investments: |  |
Financial Assets |  |
Investments: |  | 2,234
Fair Value, Recurring | Level 3 |  |
Financial Assets |  |
Total | 0 | 0
Liabilities, Fair Value Disclosure [Abstract] |  |
Total |  | 24,530
Fair Value, Recurring | Level 3 | Corporate |  |
Financial Assets |  |
Estimated Fair Value | 0 |
Fair Value, Recurring | Level 3 | U.S. Treasury |  |
Financial Assets |  |
Estimated Fair Value | 0 |
Fair Value, Recurring | Level 3 | States and municipalities |  |
Financial Assets |  |
Estimated Fair Value | 0 |
Fair Value, Recurring | Level 3 | Foreign |  |
Financial Assets |  |
Estimated Fair Value | 0 | 0
Fair Value, Recurring | Level 3 | Asset-backed securities |  |
Financial Assets |  |
Estimated Fair Value | 0 |
Fair Value, Recurring | Level 3 | Mortgage-backed securities |  |
Financial Assets |  |
Estimated Fair Value | 0 |
Fair Value, Recurring | Level 3 | Common stocks |  |
Financial Assets |  |
Estimated Fair Value | $ 0 |
Fair Value, Recurring | Level 3 | Public Warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Fair Value |  | 0
Fair Value, Recurring | Level 3 | Private Warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Fair Value |  | 476
Fair Value, Recurring | Level 3 | Underwriter Warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Fair Value |  | 53
Fair Value, Recurring | Level 3 | OTM Warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Fair Value |  | 3,981
Fair Value, Recurring | Level 3 | PIPE Warrants |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Fair Value |  | 20,020
Fair Value, Recurring | Level 3 | Investments: |  |
Financial Assets |  |
Investments: |  | $ 0

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Data Type: | na
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