RESERVE FOR LOSSES AND LOSS EXPENSES - Prior Year Development (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior years - net favorable (adverse) effect	$ 20,229	$ 0	$ 38,166	$ 0
Insurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior years - net favorable (adverse) effect	15,216	0	29,194	0
Reinsurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Prior years - net favorable (adverse) effect	$ 5,013	$ 0	$ 8,972	$ 0