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Parent Corporation Balance Sheets (Details) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Fixed income securities, available-for-sale, amortized cost $ 7,185,754 $ 6,490,753  
Fixed income securities, available-for-sale, allowance for credit loss $ 45,721 $ 9,724 $ 3,969
Common Stock [Member]      
Common Stock, Par or Stated Value (in dollars per share) $ 2 $ 2  
Common Stock, Shares Authorized 360,000,000 360,000,000  
Common Stock, Shares, Issued 104,847,111 104,450,916  
Preferred Stock [Member]      
Preferred Stock, Par or Stated Value (in dollars per share) $ 0 $ 0  
Preferred Stock, Liquidation Preference (in dollars per share) $ 25,000 $ 25,000  
Preferred Stock, Shares Authorized 5,000,000 5,000,000  
Preferred Stock, Shares Issued 8,000 8,000  
Parent Company [Member]      
Fixed income securities, available-for-sale, amortized cost $ 418,588 $ 317,703  
Fixed income securities, available-for-sale, allowance for credit loss $ 1,194 $ 542