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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Statement of Financial Position [Abstract]    
Fixed income securities, held-to-maturity, fair value $ 23,522 $ 29,837
Fixed Income Securities, Available-for-sale, Allowance for Credit Loss 33,554 45,721
Fixed income securities, available-for-sale, amortized cost 7,441,048 7,185,754
Commercial mortgage loans, fair value 147,540 139,243
Equity Securities, cost 134,358 167,431
Property and equipment, accumulated depreciation and amortization $ 257,277 $ 251,209
Preferred Stock, Shares Outstanding (share amounts not in thousands) 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 (share amounts not in thousands) 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 105,074,577 104,847,111
Treasury stock [Member]    
Treasury stock, shares 44,581,991 44,508,211