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Investments - Net Investment Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Components of net investment income      
Gross investment income $ 131,849 $ 94,288 $ 84,982
Investment expenses (7,440) (5,523) (4,895)
Net investment income 124,409 88,765 80,087
Fixed maturities      
Components of net investment income      
Gross investment income 129,530 94,117 83,313
Short-term investments      
Components of net investment income      
Gross investment income $ 2,319 $ 171 $ 1,669