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Parent Corporation Balance Sheets (Details) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fixed Income Securities, Available-for-sale, Allowance for Credit Loss $ 3,969 $ 0
Fixed income securities, Available-For-Sale, Amortized Cost $ 6,073,517 $ 5,879,986
Series B [Member]    
Preferred Stock, Liquidation Preference (in dollars per share) $ 25,000  
Preferred Stock, Shares Issued 8,000  
Treasury Stock, Common    
Treasury Stock, Shares 44,127,109 44,023,006
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 104,032,912 103,484,159
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   0
Parent Company [Member]    
Fixed Income Securities, Available-for-sale, Allowance for Credit Loss $ 22  
Fixed income securities, Available-For-Sale, Amortized Cost $ 272,256 $ 233,753