MARKETABLE INVESTMENT SECURITIES - Schedule of Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Available-for-sale debt securities:
Total available-for-sale debt securities	$ 1,123,235	$ 866,181
Equity securities	99,627	118,790
Total marketable investment securities, including restricted amounts	1,222,862	984,971
Less: Restricted marketable investment securities	(11,455)	(11,056)
Marketable investment securities	1,211,407	973,915
Corporate bonds
Available-for-sale debt securities:
Total available-for-sale debt securities	271,848	160,559
Commercial paper
Available-for-sale debt securities:
Total available-for-sale debt securities	834,132	687,927
Other debt securities
Available-for-sale debt securities:
Total available-for-sale debt securities	$ 17,255	$ 17,695

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