INVESTMENTS - Fixed Maturities Held to Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Held to maturity
Amortized cost	$ 717,310	$ 698,351
Allowance for expected credit losses	0	0
Net carrying value	717,310	698,351
Gross unrealized gains	41	0
Gross unrealized losses	(19,656)	(23,608)
Fair value	697,695	674,743
Corporate debt
Held to maturity
Amortized cost	90,200	85,200
Allowance for expected credit losses	0	0
Net carrying value	90,200	85,200
Gross unrealized gains	0	0
Gross unrealized losses	(11,411)	(11,428)
Fair value	78,789	73,772
ABS
Held to maturity
Amortized cost	627,110	613,151
Allowance for expected credit losses	0	0
Net carrying value	627,110	613,151
Gross unrealized gains	41	0
Gross unrealized losses	(8,245)	(12,180)
Fair value	$ 618,906	$ 600,971