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Investments - Net Investment Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Components of net investment income    
Gross investment income $ 26,267 $ 23,105
Investment expenses (1,587) (1,317)
Net investment income 24,680 21,788
Fixed maturities    
Components of net investment income    
Gross investment income 26,223 23,024
Short-term investments    
Components of net investment income    
Gross investment income $ 44 $ 81