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Consolidated Balance Sheets (Parentheticals) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Statement of Financial Position [Abstract]    
Fixed income securities, held-to-maturity, fair value $ 24,800 $ 24,735
Fixed income securities, available-for-sale, allowance for credit loss 30,175 31,948
Fixed income securities, available-for-sale, amortized cost 8,871,026 8,476,078
Commercial mortgage loans, fair value 251,498 224,842
Equity securities, cost 263,305 211,486
Property and equipment, accumulated depreciation and amortization $ 294,790 $ 287,685
Preferred stock, par or stated value (in dollars per share) $ 0 $ 0
Preferred stock, authorized (in shares) 5,000,000 5,000,000
Preferred stock, issued (in shares) 8,000 8,000
Preferred stock, liquidation preference (in dollars per share) $ 25,000 $ 25,000
Common stock, par or stated value (in dollars per share) $ 2 $ 2
Common stock, authorized (in shares) 360,000,000 360,000,000
Common stock, issued (in shares) 105,836,427 105,609,364
Treasury stock, common (in shares) 45,063,439 44,761,468