INVESTMENTS AND FAIR VALUE MEASUREMENTS - AMORTIZED COST (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	$ 150,257	$ 118,761
Unrealized Gains	5,501	3,006
Unrealized Losses	(9,234)	(9,109)
Fair Value	146,524	112,658
Marketable Equity Securities
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	83,168	79,625
Unrealized Gains	4,877	2,776
Unrealized Losses	(9,065)	(8,979)
Fair Value	78,980	73,422
Marketable Equity Securities | Mutual Fund
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	26,683	26,352
Unrealized Gains	0	0
Unrealized Losses	(2,988)	(3,143)
Fair Value	23,695	23,209
Marketable Equity Securities | Equity Securities
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	56,485	53,273
Unrealized Gains	4,877	2,776
Unrealized Losses	(6,077)	(5,836)
Fair Value	55,285	50,213
Marketable Debt Securities
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	67,089	39,136
Unrealized Gains	624	230
Unrealized Losses	(169)	(130)
Fair Value	67,544	39,236
Marketable Debt Securities | Corporate Bond Securities
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	18,555	13,496
Unrealized Gains	211	48
Unrealized Losses	(156)	(106)
Fair Value	18,610	13,438
Marketable Debt Securities | U.S. treasury securities
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	48,534	25,640
Unrealized Gains	413	182
Unrealized Losses	(13)	(24)
Fair Value	$ 48,934	$ 25,798