INVESTMENTS AND FAIR VALUE MEASUREMENTS - MARKETABLE SECURITIES ON BS (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Debt and Equity Securities, FV-NI
Corporate bonds	$ 17,147
Other assets	3,705	$ 4,809
Total assets at fair value	96,623	93,717
Mutual Fund
Debt and Equity Securities, FV-NI
Equity securities and mutual funds	37,307	49,662
Equity Securities
Debt and Equity Securities, FV-NI
Equity securities and mutual funds	42,169	36,769
Corporate Bond Securities
Debt and Equity Securities, FV-NI
Corporate bonds	17,147	7,286
Marketable Securities
Debt and Equity Securities, FV-NI
Marketable equity securities	79,476	86,431
Marketable Securities | Mutual Fund
Debt and Equity Securities, FV-NI
Equity securities and mutual funds	37,307	49,662
Marketable Securities | Equity Securities
Debt and Equity Securities, FV-NI
Equity securities and mutual funds	42,169	36,769
Marketable Securities | Corporate Bond Securities
Debt and Equity Securities, FV-NI
Corporate bonds	0	0
Other Current Assets
Debt and Equity Securities, FV-NI
Other assets	17,147	7,286
Other Current Assets | Mutual Fund
Debt and Equity Securities, FV-NI
Equity securities and mutual funds	0	0
Other Current Assets | Equity Securities
Debt and Equity Securities, FV-NI
Equity securities and mutual funds	0	0
Other Current Assets | Corporate Bond Securities
Debt and Equity Securities, FV-NI
Corporate bonds	$ 17,147	$ 7,286