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Parent Corporation Balance Sheets (Details) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Fixed Income Securities, Available-for-sale, Allowance for Credit Loss $ (9,724) $ (3,969) $ 0
Fixed income securities, Available-For-Sale, Amortized Cost $ 6,490,753 $ 6,073,517  
Series B [Member]      
Preferred Stock, Liquidation Preference (in dollars per share) $ 25,000    
Treasury Stock, Common      
Treasury Stock, Shares 44,266,534 44,127,109  
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 104,450,916 104,032,912  
Preferred Stock [Member]      
Preferred Stock, Par or Stated Value (in dollars per share) $ 0 $ 0  
Preferred Stock, Shares Authorized 5,000,000 5,000,000  
Preferred Stock, Shares Issued   8,000  
Parent Company [Member]      
Fixed Income Securities, Available-for-sale, Allowance for Credit Loss $ 542    
Fixed income securities, Available-For-Sale, Amortized Cost $ 317,703