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LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES - Schedule of Liability for Unpaid Claims and Claims Adjustment Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Insurance Loss Reserves [Abstract]            
Case reserves $ 236,724   $ 236,724   $ 230,633  
IBNR 701,584   701,584   630,336  
Total 938,308 $ 811,152 938,308 $ 811,152 860,969 $ 661,554
Liability for Unpaid Claims and Claims Adjustment Expense            
Gross balance at January 1     860,969 661,554    
Less: Losses recoverable         (85,790) $ (25,687)
Net balance at January 1     775,179 635,867    
Incurred losses related to:            
Current year     303,474 305,467    
Prior years 817 (5,655) 8,082 (943)    
Total incurred     311,556 304,524    
Paid losses related to:            
Current year     (35,136) (27,382)    
Prior years     (229,908) (176,210)    
Total paid     (265,043) (203,592)    
Foreign exchange and translation adjustment     33,833 8,405    
Net balance at September 30 855,525 745,205 855,525 745,205    
Add: Losses recoverable (see Note 8) 82,783 65,947 82,783 65,947 $ 85,790  
Gross balance at September 30 $ 938,308 $ 811,152 $ 938,308 $ 811,152