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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Fixed income securities, held-to-maturity, fair value $ 25,204 $ 18,001
Fixed Income Securities, Available-for-sale, Allowance for Credit Loss (8,781) (3,969)
Fixed income securities, available-for-sale, amortized cost 6,253,077 6,073,517
Commercial mortgage loan, fair value 62,233 47,289
Equity Securities, cost 304,159 301,551
Property and equipment, accumulated depreciation and amortization $ 245,844 $ 240,150
Preferred Stock, Shares Outstanding 8,000 8,000
Preferred Stock    
Preferred stock, Par or Stated Value (in dollars per share) $ 0 $ 0
Preferred stock, shares authorized 5,000,000 5,000,000
Series B    
Preferred Stock, Liquidation Preference (in dollars per share) $ 25,000 $ 25,000
Preferred stock, shares issued 8,000 8,000
Preferred Stock, Shares Outstanding 8,000 8,000
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 104,287,791 104,032,912
Treasury stock [Member]    
Treasury stock, shares 44,263,908 44,127,109