INVESTMENTS - (Net Realized Gains (Losses) by Major Investment Category (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Gross realized and unrealized gains:
Total gross realized and unrealized gains	$ 3,461	$ 29,057	$ 8,757
Total gross realized and unrealized losses	(1,869)	(11,025)	(1,673)
Net realized and unrealized gains (losses) on investments	1,592	18,032	7,084
Debt securities
Gross realized and unrealized gains:
Total gross realized and unrealized gains	3,426	20,470	2,829
Total gross realized and unrealized losses	(1,837)	(2,879)	(664)
Equity securities
Gross realized and unrealized gains:
Total gross realized and unrealized gains	35	8,587	5,928
Total gross realized and unrealized losses	$ (32)	$ (8,146)	$ (1,009)