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REINSURANCE - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
Ceded Credit Risk [Line Items] |  |  |  |
Premiums receivable | $ 8,431,335 | $ 7,280,682 |  |
Premium receivable, allowance for credit loss | 4,964 | 3,514 | $ 3,371 | $ 4,606
Reinsurance recoverable | 5,000,000 | 5,300,000 |  |
Reinsurance recoverable, allowance for credit loss | $ 11,989 | $ 13,280 | $ 11,504 | $ 12,169
Reinsurer Concentration Risk | Reinsurance Recoverable | Customer One |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Concentration risk, percentage | 15.50% | 17.60% |  |
Reinsurer Concentration Risk | Reinsurance Recoverable | Customer Two |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Concentration risk, percentage | 13.30% | 14.30% |  |
Reinsurer Concentration Risk | Reinsurance Recoverable | Customer Three |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Concentration risk, percentage | 9.00% | 8.70% |  |
Customer Concentration Risk | Allowance for Reinsurance Recoverable | Customer One |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Concentration risk, percentage | 14.10% | 10.90% |  |
Customer Concentration Risk | Allowance for Reinsurance Recoverable | Customer Two |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Concentration risk, percentage | 10.50% | 10.70% |  |
Customer Concentration Risk | Allowance for Reinsurance Recoverable | Customer Three |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Concentration risk, percentage | 5.80% | 8.10% |  |
Ceded Credit Risk, Secured | Reinsurer Concentration Risk | Reinsurance Recoverable |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Concentration risk, percentage | 57.80% | 60.60% |  |
Ceded Credit Risk, Unsecured | Reinsurer Concentration Risk | Reinsurance Recoverable | Standard & Poor's, A- Rating |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Concentration risk, percentage | 41.00% | 38.50% |  |
Ceded Credit Risk, Unsecured | Reinsurer Concentration Risk | Reinsurance Recoverable | Standard & Poor's, BBB Rating |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Concentration risk, percentage | 1.20% | 0.90% |  |

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