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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Statement Of Financial Position [Abstract] |  |
Available-for-sale, amortized cost | $ 2,480,480 | $ 2,346,267
Available-for-sale, allowance for credit losses | 292 | 441
Equity securities, cost | 327,246 | 324,501
Premiums and reinsurance balances receivable, allowances for uncollectible amounts | 18,193 | 18,067
Reinsurance balances recoverable on unpaid losses and settlement expenses, allowances for uncollectible amounts | 10,949 | 11,188
Property and equipment, accumulated depreciation | $ 71,680 | $ 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) | 68,299,018 | 68,219,551
Common stock, shares outstanding (in shares) | 45,368,804 | 45,289,337
Treasury stock, shares (in shares) | 22,930,214 | 22,930,214

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- Definition A valuation allowance for the amount deemed uncollectible of an insurance receivable related to a policy by which an insurer indemnifies itself of some or all of the risk associated with another insurance policy. Includes the carrying value as of the balance sheet date of the estimated valuation allowance to reduce gross premiums receivable to net realizable value. + References No definition available. + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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