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Investments - Net Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Components of net investment income    
Gross investment income $ 53,431 $ 45,194
Investment expenses (1,346) (1,958)
Net investment income 52,085 43,236
Fixed maturities    
Components of net investment income    
Gross investment income 46,288 43,473
Short-term investments    
Components of net investment income    
Gross investment income $ 7,143 $ 1,721