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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 |

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