LOSS AND LOSS ADJUSTMENT EXPENSE RESERVES - Liability for Unpaid Claims and Claims Adjustment Expense (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Insurance Loss Reserves [Abstract]
Case reserves	$ 216,200		$ 189,050
IBNR	594,952		472,504
Total	811,152	$ 658,234	661,554	$ 555,468
Liability for Unpaid Claims and Claims Adjustment Expense
Gross balance at January 1	661,554	555,468
Less: Losses recoverable			(25,687)	$ (13,239)
Net balance at January 1	635,867	542,229
Incurred losses related to:
Current year	305,467	273,570
Prior years	(943)	10,502
Total incurred	304,524	284,072
Paid losses related to:
Current year	(27,382)	(41,026)
Prior years	(176,210)	(154,374)
Total paid	(203,592)	(195,400)
Foreign currency revaluation	8,405	(858)
Net balance at September 30	745,205	630,043
Add: Losses recoverable (see Note 8)	65,947	28,191	$ 25,687
Gross balance at September 30	$ 811,152	$ 658,234