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INVESTMENTS AND FAIR VALUE MEASUREMENTS - Investments (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Summary of Investment Holdings [Line Items]          
Average remaining maturities for short-term available for sale investments     5 months    
Proceeds from sales of available-for-sale investments $ 13,000,000 $ 0 $ 12,983,000 $ 0  
Unfunded commitments 0   0    
Other Assets          
Summary of Investment Holdings [Line Items]          
Direct investments in privately-held companies 24,300,000   24,300,000   $ 24,400,000
Private Equity Funds          
Summary of Investment Holdings [Line Items]          
Alternative investment $ 16,600,000   $ 16,600,000   $ 21,500,000