SUMMARY OF INVESTMENTS - Net Investment Gains and Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Net investment gains (losses):
Available-for-sale	$ (609)	$ (1,731)	$ (1,406)	$ (5,776)
Allowance for credit losses	0	0	0	1
Net gains (losses) recognized on equity securities sold during the period	0	0	0	1,362
Unrealized gains (losses) recognized during the period on equity securities held at reporting date	0	0	0	0
Net gains (losses) recognized during the reporting period on equity securities	0	0	0	1,362
Mortgage loans allowance for credit losses	0	0	(1,102)	10
Other long-term investments	204	51	347	292
Total net investment gains (losses)	$ (405)	$ (1,680)	$ (2,161)	$ (4,111)