INVESTMENTS - Fixed Maturities Held to Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Held to maturity
Amortized cost	$ 405,041	$ 443,400
Allowance for expected credit losses	0	0
Net carrying value	405,041	443,400
Gross unrealized gains	2,059	1,235
Gross unrealized losses	(6,310)	(7,884)
Fair value	400,790	436,751
Corporate debt
Held to maturity
Amortized cost	128,906	122,706
Allowance for expected credit losses	0	0
Net carrying value	128,906	122,706
Gross unrealized gains	1,307	675
Gross unrealized losses	(6,178)	(7,764)
Fair value	124,035	115,617
Held-to-maturity securities with maturity after one year through three years	28,000	28,000
Held-to-maturity securities with maturity after three years through ten years	98,000	95,000
Held-to-maturity securities with maturity after ten years	3,000	0
ABS
Held to maturity
Amortized cost	276,135	320,694
Allowance for expected credit losses	0	0
Net carrying value	276,135	320,694
Gross unrealized gains	752	560
Gross unrealized losses	(132)	(120)
Fair value	276,755	321,134
Held-to-maturity securities without a single maturity date	$ 276,000	$ 321,000