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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Statement of Financial Position [Abstract]    
Fixed income securities, held-to-maturity, fair value $ 22,356 $ 29,837
Fixed income securities, available-for-sale, allowance for credit loss 31,425 45,721
Fixed income securities, available-for-sale, amortized cost 7,564,942 7,185,754
Commercial mortgage loans, fair value 163,068 139,243
Equity securities, cost 118,898 167,431
Property and equipment, accumulated depreciation and amortization $ 262,013 $ 251,209
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 105,148,165 104,847,111
Treasury stock [Member]    
Treasury stock, shares 44,582,682 44,508,211