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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Statement Of Financial Position [Abstract]    
Available-for-sale, amortized cost $ 2,933,313 $ 2,945,273
Available-for-sale, allowance for credit losses 465 339
Equity securities, cost 333,229 328,019
Premiums and reinsurance balances receivable, allowances for uncollectible amounts 18,723 18,696
Reinsurance balances recoverable on unpaid losses and settlement expenses, allowances for uncollectible amounts 10,922 11,250
Property and equipment, accumulated depreciation $ 70,477 $ 68,633
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) 68,484,910 68,399,966
Common stock, shares outstanding (in shares) 45,554,696 45,469,752
Treasury stock, shares (in shares) 22,930,214 22,930,214