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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Fixed Income Securities, Held-to-maturity, Fair Value $ 29,460 $ 18,001
Fixed Income Securities, Available-for-sale, Allowance for Credit Loss (9,724) (3,969)
Fixed income securities, Available-For-Sale, Amortized Cost 6,490,753 6,073,517
Commercial mortgage loan, fair value 97,598 47,289
Equity securities, cost 308,840 301,551
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment $ 253,427 $ 240,150
Series B [Member]    
Preferred Stock, Liquidation Preference (in dollars per share) $ 25,000  
Preferred Stock [Member]    
Preferred Stock, Shares Authorized 5,000,000 5,000,000
Preferred Stock, Par or Stated Value (in dollars per share) $ 0 $ 0
Preferred Stock, Shares Issued   8,000
Common Stock [Member]    
Common Stock, Shares Authorized 360,000,000 360,000,000
Common Stock, Shares, Issued 104,450,916 104,032,912
Common Stock, Par or Stated Value (in dollars per share) $ 2 $ 2
Treasury Stock, Common    
Treasury Stock, Shares 44,266,534 44,127,109