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REINSURANCE - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022 | Mar. 31, 2022 | Dec. 31, 2021
Ceded Credit Risk [Line Items] |  |  |  |
Premiums receivable | $ 5,933,701 | $ 5,139,471 |  |
Premium receivable, allowance for credit loss | 3,371 | 4,606 | $ 2,776 | $ 2,776
Reinsurance recoverable | 4,700,000 | 4,700,000 |  |
Reinsurance recoverable, allowance for credit loss | $ 11,504 | $ 12,169 | $ 8,344 | $ 8,344
Reinsurer Concentration Risk | Reinsurance recoverable | Customer One |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Concentration risk, percentage | 19.20% | 20.80% |  |
Reinsurer Concentration Risk | Reinsurance recoverable | Customer Two |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Concentration risk, percentage | 8.20% | 7.00% |  |
Reinsurer Concentration Risk | Reinsurance recoverable | Customer Three |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Concentration risk, percentage | 6.20% | 5.40% |  |
Customer Concentration Risk | Allowance for reinsurance recoverable | Customer One |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Concentration risk, percentage | 15.10% | 14.30% |  |
Customer Concentration Risk | Allowance for reinsurance recoverable | Customer Two |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Concentration risk, percentage | 9.70% | 9.10% |  |
Customer Concentration Risk | Allowance for reinsurance recoverable | Customer Three |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Concentration risk, percentage | 6.50% | 8.00% |  |
Ceded Credit Risk, Secured | Reinsurer Concentration Risk | Reinsurance recoverable |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Concentration risk, percentage | 48.70% | 47.20% |  |
Ceded Credit Risk, Unsecured | Reinsurer Concentration Risk | Reinsurance recoverable | Standard & Poor's, A- Rating |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Concentration risk, percentage | 50.70% | 52.00% |  |
Ceded Credit Risk, Unsecured | Reinsurer Concentration Risk | Reinsurance recoverable | Standard & Poor's, BBB Rating |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |
Concentration risk, percentage | 0.60% | 0.80% |  |

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