INVESTMENTS - Fixed Maturities, Held to Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Amortized cost	$ 443,400	$ 686,296
Allowance for expected credit losses	0	0
Net carrying value	443,400	686,296
Gross unrealized gains	1,235	303
Gross unrealized losses	(7,884)	(10,748)
Fair value	436,751	675,851
Corporate debt
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Amortized cost	122,706	95,200
Allowance for expected credit losses	0	0
Net carrying value	122,706	95,200
Gross unrealized gains	675	298
Gross unrealized losses	(7,764)	(8,827)
Fair value	115,617	86,671
ABS
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Amortized cost	320,694	591,096
Allowance for expected credit losses	0	0
Net carrying value	320,694	591,096
Gross unrealized gains	560	5
Gross unrealized losses	(120)	(1,921)
Fair value	$ 321,134	$ 589,180