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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Statement of Financial Position [Abstract] |  |
Fixed maturities, available for sale, amortized cost | $ 12,202,767,000 | $ 11,566,930,000
Fixed maturities, available for sale, allowance for credit loss | 399,000 | 323,000
Fixed maturities, held to maturity, fair value | 416,821,000 | 0
Fixed maturities, held to maturity, allowance for credit loss | 0 |
Equity securities, cost | 510,891,000 | 421,744,000
Credit losses associated with commercial mortgage loans | 0 | 0
Allowance for expected credit losses on insurance and reinsurance premium balances receivable | 8,903,000 | 8,836,000
Allowance for expected credit losses on reinsurance recoverable for unpaid losses and loss expenses | $ 27,087,000 | $ 23,711,000
Common shares, shares issued (in shares) | 176,580 | 176,580
Common shares, shares outstanding (in shares) | 84,773 | 84,353
Treasury shares, shares (in shares) | 91,807 | 92,227

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- Definition The reserve to cover probable credit losses related to specifically identified fixed maturity real estate loans as well as probable credit losses inherent in the remainder of that loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123605502&loc=d3e21338-158488 + Details
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