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Investments Available-for-Sale Securities in a Loss Position Narrative (Details)
$ in Thousands
Sep. 30, 2022
USD ($)
Rate
Dec. 31, 2021
USD ($)
Debt Securities, Available-for-sale [Line Items]    
Number of available-for-sale securities in unrealized loss positions 984  
Total Estimated Fair Value $ 1,553,078 $ 650,444
Gross Unrealized Losses $ 189,343 $ 9,760
Number of available-for-sale securities in unrealized loss positions, greater than one year 130  
Credit losses $ 0  
Fixed maturities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, percentage of securities with ratings of A minus or better | Rate 79.80%