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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Statement of Financial Position [Abstract]    
Fixed income securities, held-to-maturity, fair value $ 31,482 $ 29,460
Fixed Income Securities, Available-for-sale, Allowance for Credit Loss (52,337) (9,724)
Commercial mortgage loans, fair value 136,652 97,598
Fixed income securities, available-for-sale, amortized cost 7,107,011 6,490,753
Equity Securities, cost 188,964 308,840
Property and equipment, accumulated depreciation and amortization $ 271,563 $ 253,427
Preferred Stock, Shares Outstanding 8,000 8,000
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 8,000
Preferred Stock, Shares Outstanding 8,000 8,000
Preferred Stock, Liquidation Preference (in dollars per share) $ 25,000 $ 25,000
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 104,778,828 104,450,916
Treasury stock [Member]    
Treasury stock, shares 44,505,337 44,266,534