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COMMITMENTS AND CONTINGENCIES - Reinsurance and Premiums (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 USD ($) broker | Dec. 31, 2023 USD ($) broker | Dec. 31, 2022 USD ($) broker
Concentration Risk [Line Items] |  |  |
Allowance for estimated uncollectible premium balances receivable | $ 17,339 | $ 11,997 | $ 9,521
Premiums receivable, bad debt expense charges | 3,000 | 2,000 | $ 0
Premiums receivable | $ 3,169,355 | $ 3,067,554 |
Reinsurance Recoverable On Unpaid And Paid Losses | Reinsurer Concentration | Ceded Credit Risk, Secured |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 17.00% | 14.00% |
Reinsurance Recoverable On Unpaid And Paid Losses | Reinsurer Concentration | AM Best, A- Rating Or Higher |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 81.00% | 83.00% |
Reinsurance Recoverable On Unpaid And Paid Losses | Reinsurer Concentration | AM Best, A- Rating Or Lower |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 2.00% | 3.00% |
Reinsurance Recoverable On Unpaid And Paid Losses | Reinsurer Concentration | Reinsurer 1 |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 12.00% | 14.00% |
Reinsurance Recoverable On Unpaid And Paid Losses | Reinsurer Concentration | Reinsurer 2 |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 7.00% | 9.00% |
Reinsurance Recoverable On Unpaid And Paid Losses | Reinsurer Concentration | Reinsurer 3 |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 5.00% | 4.00% |
Gross Premiums Written | Customer Concentration |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, number of brokers exceeding threshold | broker | 3 | 3 | 3
Gross Premiums Written | Customer Concentration | Three Brokers |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 38.00% | 38.00% | 43.00%
Gross Premiums Written | Customer Concentration | Marsh & McLennan Companies Inc. |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 14.00% | 14.00% | 17.00%
Gross Premiums Written | Customer Concentration | Aon plc |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 14.00% | 15.00% | 17.00%
Gross Premiums Written | Customer Concentration | Arthur J. Gallagher & Co. |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage of total | 10.00% | 9.00% | 9.00%

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