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MARKETABLE INVESTMENT SECURITIES - Activity on Available for Sale Securities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]        
Proceeds from sales $ 71,586 $ 0 $ 209,063 $ 37,904