INVESTMENTS (Net Realized Gains (Losses) by Major Investment Category (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Gross realized and unrealized gains:
Total gross realized and unrealized gains	$ 1,558	$ 2,280	$ 2,839	$ 15,274
Gross realized and unrealized losses:
Total gross realized and unrealized losses	(285)	(956)	(1,315)	(6,392)
Net realized and unrealized gains (losses) on investments	1,273	1,324	1,524	8,882
Debt Securities
Gross realized and unrealized gains:
Debt securities	1,590	919	2,758	11,708
Gross realized and unrealized losses:
Debt securities	(275)	(121)	(1,297)	(2,608)
Equity Securities
Gross realized and unrealized gains:
Equity securities	(32)	1,361	81	3,566
Gross realized and unrealized losses:
Equity securities	$ (10)	$ (835)	$ (18)	$ (3,784)