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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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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.

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