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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