INVESTMENTS AND FAIR VALUE MEASUREMENTS - AMORTIZED COST (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	$ 132,312	$ 118,761
Unrealized Gains	9,675	3,006
Unrealized Losses	(4,346)	(9,109)
Fair Value	137,641	112,658
Marketable equity securities
Debt and Equity Securities, FV-NI
Cost or Amortized Cost		79,625
Unrealized Gains		2,776
Unrealized Losses		(8,979)
Fair Value		73,422
Marketable equity securities | Mutual funds
Debt and Equity Securities, FV-NI
Cost or Amortized Cost		26,352
Unrealized Gains		0
Unrealized Losses		(3,143)
Fair Value		23,209
Marketable equity securities | Equity securities
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	59,228	53,273
Unrealized Gains	7,896	2,776
Unrealized Losses	(4,146)	(5,836)
Fair Value	62,978	50,213
Marketable debt securities
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	73,084	39,136
Unrealized Gains	1,779	230
Unrealized Losses	(200)	(130)
Fair Value	74,663	39,236
Marketable debt securities | U.S. treasury securities
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	53,662	25,640
Unrealized Gains	1,307	182
Unrealized Losses	(3)	(24)
Fair Value	54,966	25,798
Marketable debt securities | Corporate bonds
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	19,422	13,496
Unrealized Gains	472	48
Unrealized Losses	(197)	(106)
Fair Value	$ 19,697	$ 13,438