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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 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Insurance Loss Reserves [Abstract]        
Case reserves $ 230,182   $ 230,633  
IBNR 686,418   630,336  
Total 916,600 $ 730,655 860,969 $ 661,554
Liability for Unpaid Claims and Claims Adjustment Expense        
Gross balance at January 1 860,969 661,554 661,554  
Less: Losses recoverable     (85,790) (25,687)
Net balance at January 1 775,179 635,867 635,867  
Incurred losses related to:        
Current year 118,666 103,925    
Prior years 4,218 5,401 4,218 5,401
Total incurred 122,884 109,326    
Paid losses related to:        
Current year (6,352) (3,525)    
Prior years (75,203) (53,343)    
Total paid (81,555) (56,868)    
Foreign exchange and translation adjustment 12,129 (2,435)    
Net balance at March 31 828,637 685,890 775,179 635,867
Add: Losses recoverable (see Note 8) 87,963 44,765 85,790  
Gross balance at March 31 $ 916,600 $ 730,655 $ 860,969 $ 661,554