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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Fixed maturities, available for sale, amortized cost	$ 12,634,254	$ 12,176,473
Fixed maturities, available for sale, allowance for credit loss	10,759	11,733	$ 313	$ 323
Fixed maturities, held to maturity, fair value	675,851	674,743
Fixed maturities, held to maturity, allowance for credit loss	0	0
Equity securities, cost	543,833	494,356
Allowance for expected credit losses	6,220	0
Allowance for credit losses on premium balances receivable	11,997	9,521
Allowance for credit losses on reinsurance recoverable for unpaid losses and loss expenses	$ 36,611	$ 30,715	$ 30,000
Common shares, shares issued (in shares)	176,580	176,580
Common shares, shares outstanding (in shares)	85,286	84,668
Treasury shares (in shares)	91,294	91,912

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