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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Statement Of Financial Position [Abstract]    
Available-for-sale, amortized cost $ 2,945,273 $ 2,346,267
Available-for-sale, allowance for credit losses 339 441
Equity securities, cost 328,019 324,501
Premiums and reinsurance balances receivable, allowances for uncollectible amounts 18,696 18,067
Reinsurance balances recoverable on unpaid losses and settlement expenses, allowances for uncollectible amounts 11,250 11,188
Property and equipment, accumulated depreciation $ 68,633 $ 75,236
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 200,000,000 200,000,000
Common stock, shares issued (in shares) 68,399,966 68,219,551
Common stock, shares outstanding (in shares) 45,469,752 45,289,337
Treasury stock, shares (in shares) 22,930,214 22,930,214