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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Amortized cost	$ 12,264,498	$ 12,176,473
Fixed maturities, available for sale, allowance for credit loss	12,645	11,733
Fixed maturities, held to maturity, fair value	696,775	674,743
Fixed maturities, held to maturity, allowance for credit loss	0	0
Equity securities, cost	559,293	494,356
Allowance for expected credit losses	1,900	0
Allowance for expected credit losses on insurance and reinsurance premium balances receivable	9,528	9,521
Allowance for expected credit losses on reinsurance recoverable for unpaid losses and loss expenses	$ 32,347	$ 30,715
Common shares, shares issued (in shares)	176,580	176,580
Common shares, shares outstanding (in shares)	85,183	84,668
Treasury shares, shares (in shares)	91,397	91,912

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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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Number of previously issued common shares repurchased by the issuing entity and held in treasury.

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