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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Amortized cost	$ 12,714,210	$ 12,634,254
Fixed maturities, available for sale, allowance for credit loss	4,237	10,759
Fixed maturities, held to maturity, fair value	683,726	675,851
Fixed maturities, held to maturity, allowance for credit loss	0	0
Equity securities, cost	545,538	543,833
Mortgage loans, held for investment, allowance for credit loss	8,113	6,220
Allowance for expected credit losses on insurance and reinsurance premium balances receivable	13,103	11,997
Allowance for expected credit losses on reinsurance recoverable for unpaid losses and loss expenses	$ 37,888	$ 36,611
Common shares, shares issued (in shares)	176,580	176,580
Common shares, shares outstanding (in shares)	84,687	85,286
Treasury shares, shares (in shares)	91,893	91,294

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