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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) shares in Thousands, $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Statement of Financial Position [Abstract] |  |  |  |
Fixed maturities, available for sale, amortized cost | $ 12,419,905 | $ 12,634,254 |  |
Fixed maturities, available for sale, allowance for credit loss | 3,938 | 10,759 | $ 11,733 | $ 313
Fixed maturities, held to maturity, fair value | 436,751 | 675,851 |  |
Fixed maturities, held to maturity, allowance for credit loss | 0 | 0 |  |
Equity securities, cost | 520,743 | 543,833 |  |
Allowance for expected credit losses | 23,378 | 6,220 | 0 | $ 0
Allowance for credit losses on premium balances receivable | 17,339 | 11,997 | 9,521 |
Allowance for credit losses on reinsurance recoverable for unpaid losses and loss expenses | $ 43,445 | $ 36,611 | $ 30,715 |
Common shares, shares issued (in shares) | 176,580 | 176,580 |  |
Common shares, shares outstanding (in shares) | 82,984 | 85,286 |  |
Treasury shares (in shares) | 93,596 | 91,294 |  |

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