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REINSURANCE - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Ceded Credit Risk [Line Items] |  |  |  |  |  |
Premiums receivable (Note 5) | $ 8,130,508 | $ 7,290,228 |  |  |  |
Premium receivable, allowance for credit loss | 3,335 | 4,631 | $ 3,272 | $ 4,302 | $ 4,546 | $ 3,514
Reinsurance recoverable | 4,100,000 | 4,500,000 |  |  |  |
Reinsurance recoverable, allowance for credit loss | $ 12,988 | $ 11,730 | $ 10,808 | $ 13,176 | $ 13,582 | $ 13,280
Reinsurance Recoverable | Reinsurer Concentration Risk | Customer One |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |
Concentration risk, percentage | 11.80% | 12.60% |  |  |  |
Reinsurance Recoverable | Reinsurer Concentration Risk | Customer Two |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |
Concentration risk, percentage | 9.40% | 11.00% |  |  |  |
Reinsurance Recoverable | Reinsurer Concentration Risk | Customer Three |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |
Concentration risk, percentage | 8.20% | 8.30% |  |  |  |
Allowance for Reinsurance Recoverable | Customer Concentration Risk | Customer One |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |
Concentration risk, percentage | 19.20% | 23.90% |  |  |  |
Allowance for Reinsurance Recoverable | Customer Concentration Risk | Customer Two |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |
Concentration risk, percentage | 17.60% | 7.20% |  |  |  |
Allowance for Reinsurance Recoverable | Customer Concentration Risk | Customer Three |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |
Concentration risk, percentage | 4.60% | 5.90% |  |  |  |
Ceded Credit Risk, Secured | Reinsurance Recoverable | Reinsurer Concentration Risk |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |
Concentration risk, percentage | 48.60% | 55.70% |  |  |  |
Ceded Credit Risk, Unsecured | Reinsurance Recoverable | Reinsurer Concentration Risk | Standard & Poor's, A- Rating |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |
Concentration risk, percentage | 50.10% | 43.20% |  |  |  |
Ceded Credit Risk, Unsecured | Reinsurance Recoverable | Reinsurer Concentration Risk | Standard & Poor's, BBB Rating |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |
Concentration risk, percentage | 1.30% | 1.00% |  |  |  |

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