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Investments - Net Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Components of net investment income    
Gross investment income $ 45,194 $ 26,267
Investment expenses (1,958) (1,587)
Net investment income 43,236 24,680
Fixed maturities    
Components of net investment income    
Gross investment income 43,473 26,223
Short-term investments    
Components of net investment income    
Gross investment income $ 1,721 $ 44