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Investments Realized Gains (Losses) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Debt and Equity Securities, Realized Gain (Loss) [Abstract]    
Realized gains, fixed-maturity securities $ 1,199 $ 787
Realized losses, fixed-maturity securities (1) (23)
Net realized gains, fixed-maturity securities 1,198 764
Realized gains from the sales of short-term investments 0 12
Net realized investment gains $ 1,198 $ 776