INVESTMENTS (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Available-for-sale
Amortized Cost	$ 1,429,600	$ 1,850,101
Gross Unrealized Holding Gains	101	2
Gross Unrealized Holding Losses	5,944	957
Fair Value	1,423,757	1,849,146
Continuous Unrealized Loss Position less than 12 Months	5,944	957
Short-term \| Commercial paper
Available-for-sale
Amortized Cost	197,712	334,077
Gross Unrealized Holding Gains	1
Gross Unrealized Holding Losses	4
Fair Value	197,709	334,077
Continuous Unrealized Loss Position less than 12 Months	4
Short-term \| Certificates of deposit
Available-for-sale
Amortized Cost	10,078	44,502
Fair Value	10,078	44,502
Short-term \| Municipal securities
Available-for-sale
Amortized Cost	211,791	666
Gross Unrealized Holding Gains	60
Gross Unrealized Holding Losses	612
Fair Value	211,239	666
Continuous Unrealized Loss Position less than 12 Months	612
Short-term \| U.S. government agency securities
Available-for-sale
Amortized Cost	109,697	62,687
Gross Unrealized Holding Gains	3
Gross Unrealized Holding Losses	715	26
Fair Value	108,985	62,661
Continuous Unrealized Loss Position less than 12 Months	715	26
Short-term \| U.S. treasuries
Available-for-sale
Amortized Cost	838,825	1,308,536
Gross Unrealized Holding Gains	17	2
Gross Unrealized Holding Losses	4,539	717
Fair Value	834,303	1,307,821
Continuous Unrealized Loss Position less than 12 Months	4,539	717
Long-term \| U.S. government agency securities
Available-for-sale
Amortized Cost	2,016	12,500
Gross Unrealized Holding Losses	3	24
Fair Value	2,013	12,476
Continuous Unrealized Loss Position less than 12 Months	3	24
Long-term \| U.S. treasuries
Available-for-sale
Amortized Cost	53,215	87,133
Gross Unrealized Holding Gains	20
Gross Unrealized Holding Losses	71	190
Fair Value	53,164	86,943
Continuous Unrealized Loss Position less than 12 Months	71	$ 190
Long-term \| Variable rate demand notes
Available-for-sale
Amortized Cost	6,266
Fair Value	$ 6,266

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on 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 debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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