MARKETABLE INVESTMENT SECURITIES - Schedule of Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Fair value of marketable securities
Cash equivalents (including restricted)	$ 602,762	$ 596,471
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
Level 1
Fair value of marketable securities
Cash equivalents (including restricted)	437	657
Available-for-sale debt securities:
Total available-for-sale debt securities	12,922	15,968
Equity securities	89,436	109,002
Total marketable investment securities, including restricted amounts	102,358	124,970
Less: Restricted marketable investment securities	(11,455)	(11,056)
Marketable investment securities	90,903	113,914
Level 1 \| Corporate bonds
Available-for-sale debt securities:
Total available-for-sale debt securities	0	0
Level 1 \| Commercial paper
Available-for-sale debt securities:
Total available-for-sale debt securities	0	0
Level 1 \| Other debt securities
Available-for-sale debt securities:
Total available-for-sale debt securities	12,922	15,968
Level 2
Fair value of marketable securities
Cash equivalents (including restricted)	602,325	595,814
Available-for-sale debt securities:
Total available-for-sale debt securities	1,110,313	850,213
Equity securities	10,191	9,788
Total marketable investment securities, including restricted amounts	1,120,504	860,001
Less: Restricted marketable investment securities	0	0
Marketable investment securities	1,120,504	860,001
Level 2 \| Corporate bonds
Available-for-sale debt securities:
Total available-for-sale debt securities	271,848	160,559
Level 2 \| Commercial paper
Available-for-sale debt securities:
Total available-for-sale debt securities	834,132	687,927
Level 2 \| Other debt securities
Available-for-sale debt securities:
Total available-for-sale debt securities	$ 4,333	$ 1,727

Cash And Cash Equivalents And Restricted Cash And Cash Equivalents, Fair Value Disclosure

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