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Investments - Net Investment Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Components of net investment income |  |  |  |
Gross investment income | $ 47,073 | $ 31,289 | $ 92,268 | $ 57,556
Investment expenses | (1,823) | (1,950) | (3,782) | (3,537)
Net investment income | 45,250 | 29,339 | 88,486 | 54,019
Fixed maturities |  |  |  |
Components of net investment income |  |  |  |
Gross investment income | 43,775 | 31,074 | 87,251 | 57,298
Short-term investments |  |  |  |
Components of net investment income |  |  |  |
Gross investment income | $ 3,298 | $ 215 | $ 5,017 | $ 258

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