INVESTMENTS AND FAIR VALUE MEASUREMENTS - AMORTIZED COST (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	$ 126,466	$ 132,312
Unrealized Gains	6,894	9,675
Unrealized Losses	(4,392)	(4,346)
Fair Value	128,968	137,641
Marketable Equity Securities | Equity securities
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	52,576	59,228
Unrealized Gains	5,189	7,896
Unrealized Losses	(4,094)	(4,146)
Fair Value	53,671	62,978
Marketable Debt Securities
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	73,890	73,084
Unrealized Gains	1,705	1,779
Unrealized Losses	(298)	(200)
Fair Value	75,297	74,663
Marketable Debt Securities | U.S. treasury securities
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	45,480	53,662
Unrealized Gains	732	1,307
Unrealized Losses	0	(3)
Fair Value	46,212	54,966
Marketable Debt Securities | Corporate bonds
Debt and Equity Securities, FV-NI
Cost or Amortized Cost	28,410	19,422
Unrealized Gains	973	472
Unrealized Losses	(298)	(197)
Fair Value	$ 29,085	$ 19,697