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Investments - Net Investment Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Net Investment Income [Line Items] |  |  |  |
Gross investment income | $ 76,520 | $ 65,751 | $ 148,666 | $ 126,488
Investment expenses | (2,754) | (2,403) | (5,679) | (4,687)
Net investment income | 73,766 | 63,348 | 142,987 | 121,801
Fixed-maturities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 57,924 | 56,439 | 115,183 | 109,387
Equity securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 3,067 | 3,512 | 5,606 | 6,444
Mortgage loans held for sale |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 5,411 | 574 | 7,204 | 768
Short-term investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | 8,614 | 3,976 | 17,572 | 7,564
Other |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Gross investment income | $ 1,504 | $ 1,250 | $ 3,101 | $ 2,325

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