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INVESTMENTS AND FAIR VALUE MEASUREMENTS - MARKETABLE SECURITIES ON BS (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt and Equity Securities, FV-NI
Corporate bonds	$ 7,286
Marketable securities	86,431	$ 0
Other assets, net	12,095	$ 9,000
Total assets at fair value	93,717
Mutual Fund
Debt and Equity Securities, FV-NI
Equity securities and mutual funds	49,662
Equity Securities
Debt and Equity Securities, FV-NI
Equity securities and mutual funds	36,769
Corporate Bond Securities
Debt and Equity Securities, FV-NI
Corporate bonds	7,286
Marketable Securities
Debt and Equity Securities, FV-NI
Marketable securities	86,431
Marketable Securities \| Mutual Fund
Debt and Equity Securities, FV-NI
Equity securities and mutual funds	49,662
Marketable Securities \| Equity Securities
Debt and Equity Securities, FV-NI
Equity securities and mutual funds	36,769
Marketable Securities \| Corporate Bond Securities
Debt and Equity Securities, FV-NI
Corporate bonds	0
Other Current Assets
Debt and Equity Securities, FV-NI
Other assets, net	7,286
Other Current Assets \| Mutual Fund
Debt and Equity Securities, FV-NI
Equity securities and mutual funds	0
Other Current Assets \| Equity Securities
Debt and Equity Securities, FV-NI
Equity securities and mutual funds	0
Other Current Assets \| Corporate Bond Securities
Debt and Equity Securities, FV-NI
Corporate bonds	$ 7,286