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Investments - Net Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Components of net investment income        
Gross investment income $ 34,820 $ 23,031 $ 92,377 $ 69,195
Investment expenses (2,226) (1,458) (5,764) (4,091)
Net investment income 32,594 21,573 86,613 65,104
Fixed maturities        
Components of net investment income        
Gross investment income 33,948 23,001 91,245 69,037
Short-term investments        
Components of net investment income        
Gross investment income $ 872 $ 30 $ 1,132 $ 158