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Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | $ 1,980,439 | $ 1,545,587
U.S. government treasuries |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 619,086 | 471,851
U.S. states, territories and municipalities |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 4,354 | 4,307
Non-U.S. sovereign governments and supranationals |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 43,332 | 12,952
Corporate |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 811,337 | 647,477
Residential mortgage-backed securities - Agency |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 127,980 | 96,410
Residential mortgage-backed securities - Non-agency |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 3,944 | 4,375
Commercial mortgage-backed securities - Non-agency |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 8,893 | 9,219
Other asset-backed securities |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 12,545 | 12,885
Total fixed maturities |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 1,631,471 | 1,259,476
Short-term investments |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 348,968 | 286,111
Level 1 |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 0 | 0
Level 1 | U.S. government treasuries |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 0 | 0
Level 1 | U.S. states, territories and municipalities |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 0 | 0
Level 1 | Non-U.S. sovereign governments and supranationals |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 0 | 0
Level 1 | Corporate |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 0 | 0
Level 1 | Residential mortgage-backed securities - Agency |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 0 | 0
Level 1 | Residential mortgage-backed securities - Non-agency |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 0 | 0
Level 1 | Commercial mortgage-backed securities - Non-agency |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 0 | 0
Level 1 | Other asset-backed securities |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 0 | 0
Level 1 | Total fixed maturities |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 0 | 0
Level 1 | Short-term investments |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 0 | 0
Level 2 |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 1,980,439 | 1,545,587
Level 2 | U.S. government treasuries |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 619,086 | 471,851
Level 2 | U.S. states, territories and municipalities |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 4,354 | 4,307
Level 2 | Non-U.S. sovereign governments and supranationals |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 43,332 | 12,952
Level 2 | Corporate |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 811,337 | 647,477
Level 2 | Residential mortgage-backed securities - Agency |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 127,980 | 96,410
Level 2 | Residential mortgage-backed securities - Non-agency |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 3,944 | 4,375
Level 2 | Commercial mortgage-backed securities - Non-agency |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 8,893 | 9,219
Level 2 | Other asset-backed securities |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 12,545 | 12,885
Level 2 | Total fixed maturities |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 1,631,471 | 1,259,476
Level 2 | Short-term investments |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 348,968 | 286,111
Level 3 |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 0 | 0
Level 3 | U.S. government treasuries |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 0 | 0
Level 3 | U.S. states, territories and municipalities |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 0 | 0
Level 3 | Non-U.S. sovereign governments and supranationals |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 0 | 0
Level 3 | Corporate |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 0 | 0
Level 3 | Residential mortgage-backed securities - Agency |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 0 | 0
Level 3 | Residential mortgage-backed securities - Non-agency |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 0 | 0
Level 3 | Commercial mortgage-backed securities - Non-agency |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 0 | 0
Level 3 | Other asset-backed securities |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 0 | 0
Level 3 | Total fixed maturities |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | 0 | 0
Level 3 | Short-term investments |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |
Investments, at fair value | $ 0 | $ 0

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