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Fair Value of Financial Instruments - Quantitative Information About Level 3 Fair Value Measurements (Details) $ in Thousands | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Available-for-sale securities | $ 1,796,133 | $ 1,686,502
Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Available-for-sale securities | 1,796,133 | 1,686,503
Recurring | Fixed Maturities asset-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Available-for-sale securities | 78,923 | 3,831
Recurring | Level 3 |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Available-for-sale securities | 276 | 10,584
Recurring | Level 3 | Fixed Maturities asset-backed securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Available-for-sale securities | $ 276 | $ 869
Recurring | Level 3 | Fixed Maturities asset-backed securities | Book Value | Minimum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Available-for-sale securities, range of weighted average significant unobservable inputs | 0 |
Recurring | Level 3 | Fixed Maturities asset-backed securities | Book Value | Maximum |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Available-for-sale securities, range of weighted average significant unobservable inputs | 1 |

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