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Summary of Investments - Gains (Losses) on the Sale of Available-for-sale Fixed Maturity Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract]        
Proceeds from sales $ 145,621 $ 33,941 $ 233,999 $ 43,809
Gross realized gains 133 110 1,498 121
Gross realized losses $ 1,515 $ 358 $ 5,542 $ 547