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LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Liability for Claims and Claims Adjustment Expense        
CAT losses $ 27,015 $ 12,437    
Prior years 4,218 5,401 $ 4,218 $ 5,401
California Wildfires        
Liability for Claims and Claims Adjustment Expense        
CAT losses 27,000      
Baltimore Bridge Collapse        
Liability for Claims and Claims Adjustment Expense        
CAT losses   12,400    
Operating Segments        
Liability for Claims and Claims Adjustment Expense        
Prior years 4,329 1,472    
Operating Segments | Open Market        
Liability for Claims and Claims Adjustment Expense        
CAT losses 27,015 12,437    
Prior years 4,896 1,473 4,896 1,473
Operating Segments | Innovations        
Liability for Claims and Claims Adjustment Expense        
CAT losses 0 0    
Prior years (567) (1) $ (567) $ (1)
Operating Segments | Reinsurance Contract [Axis]: Adverse Reserve Development | Open Market        
Liability for Claims and Claims Adjustment Expense        
Prior years 23,200 4,100    
Operating Segments | Reinsurance Contract [Axis]: Favorable Reserve Development | Open Market        
Liability for Claims and Claims Adjustment Expense        
Prior years $ (18,300) $ (2,700)