MARKETABLE INVESTMENT SECURITIES - Schedule of Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Fair value of marketable securities
Cash equivalents (including restricted)	$ 813,399	$ 596,471
Available-for-sale debt securities:
Total available-for-sale debt securities	656,979	866,181
Equity securities	109,990	118,790
Total marketable investment securities, including restricted amounts	766,969	984,971
Less: Restricted marketable investment securities	(11,800)	(11,056)
Marketable investment securities	755,169	973,915
Corporate bonds
Available-for-sale debt securities:
Total available-for-sale debt securities	189,211	160,559
Commercial paper
Available-for-sale debt securities:
Total available-for-sale debt securities	452,642	687,927
Other debt securities
Available-for-sale debt securities:
Total available-for-sale debt securities	15,126	17,695
Level 1
Fair value of marketable securities
Cash equivalents (including restricted)	41,331	657
Available-for-sale debt securities:
Total available-for-sale debt securities	12,779	15,968
Equity securities	100,287	109,002
Total marketable investment securities, including restricted amounts	113,066	124,970
Less: Restricted marketable investment securities	(11,800)	(11,056)
Marketable investment securities	101,266	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	12,779	15,968
Level 2
Fair value of marketable securities
Cash equivalents (including restricted)	772,068	595,814
Available-for-sale debt securities:
Total available-for-sale debt securities	644,200	850,213
Equity securities	9,703	9,788
Total marketable investment securities, including restricted amounts	653,903	860,001
Less: Restricted marketable investment securities	0	0
Marketable investment securities	653,903	860,001
Level 2 \| Corporate bonds
Available-for-sale debt securities:
Total available-for-sale debt securities	189,211	160,559
Level 2 \| Commercial paper
Available-for-sale debt securities:
Total available-for-sale debt securities	452,642	687,927
Level 2 \| Other debt securities
Available-for-sale debt securities:
Total available-for-sale debt securities	$ 2,347	$ 1,727

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

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in marketable security.

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