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REINSURANCE - Schedule of Ratings from Rating Agencies and Unsecured Amounts Due from Reinsurers Exceeded 3% of Stockholders' Equity (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | $ 257,070 | $ 615,634
Various Lloyd’s of London Syndicates |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 81,469 | 282,826
Markel Bermuda Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 60,919 | 94,173
Florida Hurricane Catastrophe Fund “FHCF” |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 36,953 | 81,375
Renaissance Reinsurance Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 29,474 | 35,808
Everest Reinsurance Co |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | 24,837 | 47,807
DaVinci Reinsurance Ltd. |  |
Ceded Credit Risk [Line Items] |  |
Reinsurance unsecured amounts due from reinsurers | $ 23,418 | $ 73,645
Customers with Greater than 3% of Equity | Stockholders' Equity, Total | Amounts Due From Reinsurers |  |
Ceded Credit Risk [Line Items] |  |
Unsecured amounts due from reinsurers exceeding a fixed percentage of stockholders equity | 3.00% |

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