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Fair Value Measurements - Quantitative Information about Significant Unobservable Inputs in the Fair Value Measurement of Level 3 Assets (Details) $ in Thousands | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investment assets measured at fair value | $ 245,842 | $ 288,955 |  |
Total Level 3 securities | 556,762 | 551,689 |  |
Corporate securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Level 3 securities | 287,496 | 297,332 | $ 211,585 | $ 187,980
CLO and other ABS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Level 3 securities | 260,097 | 245,313 | $ 179,758 | $ 153,342
Valuation Technique, Discounted Cash Flow |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets measured at fair value | 310,920 | 262,734 |  |
Valuation Technique, Discounted Cash Flow | Corporate securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets measured at fair value | 155,633 | 135,524 |  |
Valuation Technique, Discounted Cash Flow | CLO and other ABS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets measured at fair value | $ 155,287 | $ 127,210 |  |
Valuation Technique, Discounted Cash Flow | Measurement Input, Credit Spread | Minimum | Corporate securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities, available-for-sale, measurement input | (0.044) | (0.044) |  |
Valuation Technique, Discounted Cash Flow | Measurement Input, Credit Spread | Minimum | CLO and other ABS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities, available-for-sale, measurement input | 0.0001 | 0.0001 |  |
Valuation Technique, Discounted Cash Flow | Measurement Input, Credit Spread | Maximum | Corporate securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities, available-for-sale, measurement input | 0.053 | 0.053 |  |
Valuation Technique, Discounted Cash Flow | Measurement Input, Credit Spread | Maximum | CLO and other ABS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities, available-for-sale, measurement input | 0.196 | 0.196 |  |
Valuation Technique, Discounted Cash Flow | Measurement Input, Credit Spread | Weighted Average | Corporate securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities, available-for-sale, measurement input | 0.018 | 0.019 |  |
Valuation Technique, Discounted Cash Flow | Measurement Input, Credit Spread | Weighted Average | CLO and other ABS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities, available-for-sale, measurement input | 0.024 | 0.024 |  |

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