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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Amortized cost	$ 12,272,258	$ 12,176,473
Fixed maturities, available for sale, allowance for credit loss	10,551	11,733
Fixed maturities, held to maturity, fair value	697,695	674,743
Fixed maturities, held to maturity, allowance for credit loss	0	0
Equity securities, cost	564,965	494,356
Allowance for expected credit losses	3,638	0
Allowance for expected credit losses on insurance and reinsurance premium balances receivable	13,309	9,521
Allowance for expected credit losses on reinsurance recoverable for unpaid losses and loss expenses	$ 33,148	$ 30,715
Common shares, shares issued (in shares)	176,580	176,580
Common shares, shares outstanding (in shares)	85,216	84,668
Treasury shares, shares (in shares)	91,364	91,912

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