MARKETABLE INVESTMENT SECURITIES - Schedule of Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Available-for-sale debt securities:
Total available-for-sale debt securities	$ 760,157	$ 866,181
Equity securities	142,590	118,790
Total marketable investment securities, including restricted amounts	902,747	984,971
Less: Restricted marketable investment securities	(8,003)	(11,056)
Marketable investment securities	894,744	973,915
Corporate bonds
Available-for-sale debt securities:
Total available-for-sale debt securities	175,444	160,559
Commercial paper
Available-for-sale debt securities:
Total available-for-sale debt securities	518,641	687,927
Other debt securities
Available-for-sale debt securities:
Total available-for-sale debt securities	$ 66,072	$ 17,695

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