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RELATED PARTY TRANSACTIONS AND MAJOR CUSTOMERS (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Related Party Transaction [Line Items] |  |  |
Gross premiums written (Note 7) | $ 11,733,066 | $ 8,862,366 | $ 9,213,540
Gross premiums earned | 10,815,336 | 8,072,193 | 7,079,632
Acquisition expenses | 2,643,867 | 1,875,034 | 1,568,606
Net reinsurance costs and recoveries | (296,775) | (376,853) | (1,512,300)
Total reserve for claims and claim expenses | 21,303,491 | 20,486,869 | 15,892,573
Equity method investment, dividends and distributions | $ 109,800 | $ 41,400 | $ 24,200
Gross premiums written | Three Brokers | Customer Concentration Risk |  |  |
Related Party Transaction [Line Items] |  |  |
Percent of gross premiums received | 82.10% | 84.30% | 82.20%
Gross premiums written | Aon plc | Customer Concentration Risk |  |  |
Related Party Transaction [Line Items] |  |  |
Percent of gross premiums received | 32.00% | 36.10% |
Gross premiums written | Marsh & McLennan Companies, Inc. | Customer Concentration Risk |  |  |
Related Party Transaction [Line Items] |  |  |
Percent of gross premiums received | 36.50% | 33.20% |
Gross premiums written | Arthur J Gallagher | Customer Concentration Risk |  |  |
Related Party Transaction [Line Items] |  |  |
Percent of gross premiums received | 13.60% | 15.00% |
Related Party | Tower Hill Companies |  |  |
Related Party Transaction [Line Items] |  |  |
Gross premiums written (Note 7) | $ 115,100 | $ 96,800 | $ 82,000
Gross premiums earned | 119,000 | 83,300 | 80,000
Acquisition expenses | 14,200 | 12,700 | 15,800
Outstanding receivable | 31,900 | 37,000 |
Net reinsurance costs and recoveries | 94,500 | (9,800) | 68,600
Total reserve for claims and claim expenses | 95,200 | 50,200 |
Equity method investment, dividends and distributions | 34,400 | 22,600 | 10,500
Related Party | Top Layer Reinsurance Ltd. |  |  |
Related Party Transaction [Line Items] |  |  |
Equity method investment, dividends and distributions | 16,800 | 7,800 | 8,700
Related Party | Management Fee | Top Layer Reinsurance Ltd. |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue recorded | $ 3,000 | $ 3,400 | $ 2,400

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