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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Statement of Financial Position [Abstract]    
Fixed Income Securities, Held-to-maturity, Fair Value $ 18,001 $ 21,975
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
Commercial mortgage loan, fair value 47,289  
Equity securities, cost 301,551 72,061
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment $ 240,150 $ 227,566
Series B [Member]    
Preferred Stock, Liquidation Preference (in dollars per share) $ 25,000  
Preferred Stock, Shares Issued 8,000  
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   0
Common Stock [Member]    
Common Stock, Shares Authorized 360,000,000 360,000,000
Common Stock, Shares, Issued 104,032,912 103,484,159
Common Stock, Par or Stated Value (in dollars per share) $ 2 $ 2
Treasury Stock, Common    
Treasury Stock, Shares 44,127,109 44,023,006