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REINSURANCE - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Ceded Credit Risk [Line Items] |  |  |
Premiums receivable | $ 7,290,228 | $ 7,280,682 |
Premium receivable, allowance for credit loss | 4,631 | 3,514 | $ 4,606
Reinsurance recoverable | 4,500,000 | 5,300,000 |
Reinsurance recoverable, allowance for credit loss | $ 11,730 | $ 13,279 | $ 12,169
Reinsurance Recoverable | Reinsurer Concentration Risk | Customer One |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk , percentage | 12.60% | 17.60% |
Reinsurance Recoverable | Reinsurer Concentration Risk | Customer Two |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk , percentage | 11.00% | 14.30% |
Reinsurance Recoverable | Reinsurer Concentration Risk | Customer Three |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk , percentage | 8.30% | 8.70% |
Allowance for Reinsurance Recoverable | Customer Concentration Risk | Customer One |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk , percentage | 23.90% | 10.90% |
Allowance for Reinsurance Recoverable | Customer Concentration Risk | Customer Two |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk , percentage | 7.20% | 10.70% |
Allowance for Reinsurance Recoverable | Customer Concentration Risk | Customer Three |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk , percentage | 5.90% | 8.10% |
Ceded Credit Risk, Secured | Reinsurance Recoverable | Reinsurer Concentration Risk |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk , percentage | 55.70% | 60.60% |
Rated A- or higher | Ceded Credit Risk, Unsecured | Reinsurance Recoverable | Reinsurer Concentration Risk |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk , percentage | 43.20% | 38.50% |
Rated lower than A- | Ceded Credit Risk, Unsecured | Reinsurance Recoverable | Reinsurer Concentration Risk |  |  |
Ceded Credit Risk [Line Items] |  |  |
Concentration risk , percentage | 1.00% | 0.90% |

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