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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Statement of Financial Position [Abstract]    
Fixed income securities, held-to-maturity, fair value $ 29,837 $ 29,460
Fixed income securities, available-for-sale, allowance for credit loss 45,721 9,724
Fixed income securities, available-for-sale, amortized cost 7,185,754 6,490,753
Commercial mortgage loans, fair value 139,243 97,598
Equity securities, at cost 167,431 308,840
Accumulated depreciation and amortization, property and equipment $ 251,209 $ 253,427
Preferred Stock, Shares Outstanding 8,000 8,000
Commercial mortgage loans, fair value $ 139,243 $ 97,598
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 104,847,111 104,450,916
Treasury stock [Member]    
Treasury Stock, Shares 44,508,211 44,266,534