INVESTMENTS AND FAIR VALUE MEASUREMENTS - AMORTIZED COST (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	$ 118,761	$ 95,096
Unrealized Gains	3,006	290
Unrealized Losses	(9,109)	(1,669)
Fair Value	112,658	93,717
Mutual Fund
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	26,352	50,000
Unrealized Gains	0	0
Unrealized Losses	(3,143)	(338)
Fair Value	23,209	49,662
Corporate Bond Securities
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	13,496	6,996
Unrealized Gains	48	290
Unrealized Losses	(106)	0
Fair Value	13,438	7,286
Equity Securities
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	53,273	38,100
Unrealized Gains	2,776	0
Unrealized Losses	(5,836)	(1,331)
Fair Value	50,213	$ 36,769
U.S. treasury securities
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	25,640
Unrealized Gains	182
Unrealized Losses	(24)
Fair Value	$ 25,798