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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Statement of Financial Position [Abstract] |  |
Amortized cost | $ 11,865,935,000 | $ 12,241,782,000
Fixed maturities, available for sale, allowance for credit loss | 10,504,000 | 313,000
Fixed maturities, held to maturity, fair value | 663,704,000 | 445,033,000
Fixed maturities, held to maturity, allowance for credit loss | 0 | 0
Equity securities, cost | 519,926,000 | 528,864,000
Credit losses associated with commercial mortgage loans | 0 | 0
Allowance for expected credit losses on insurance and reinsurance premium balances receivable | 8,893,000 | 7,567,000
Allowance for expected credit losses on reinsurance recoverable for unpaid losses and loss expenses | $ 29,022,000 | $ 29,554,000
Common shares, shares issued (in shares) | 176,580 | 176,580
Common shares, shares outstanding (in shares) | 84,666 | 84,774
Treasury shares, shares (in shares) | 91,914 | 91,806

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- Definition The carrying value as of the balance sheet date of the estimated valuation allowance to reduce gross premiums receivable to net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524 + Details
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