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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Statement of Financial Position [Abstract]    
Amortized cost $ 5,371,673 $ 5,160,174
Premiums receivable, allowance for credit losses $ 873 $ 893
Common stock, par value (in usd per share) $ 10.00 $ 10.00
Common stock, authorized (in shares) 600,000,000 600,000,000
Common stock, issued (in shares) 162,779,000  
Common stock, outstanding (in shares) 162,779,000 162,840,000