INVESTMENTS (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Available-for-sale
Amortized Cost	$ 1,291,578	$ 1,429,600
Gross Unrealized Holding Gains	25	101
Gross Unrealized Holding Losses	2,215	5,944
Fair Value	1,289,388	1,423,757
Continuous Unrealized Loss Position less than 12 Months	2,215	5,944
Continuous Unrealized Loss Position greater than 12 Months	0	0
Short-term \| Commercial paper
Available-for-sale
Amortized Cost	270,002	197,712
Gross Unrealized Holding Gains	0	1
Gross Unrealized Holding Losses	2	4
Fair Value	270,000	197,709
Continuous Unrealized Loss Position less than 12 Months	2	4
Continuous Unrealized Loss Position greater than 12 Months	0	0
Short-term \| Certificates of deposit
Available-for-sale
Amortized Cost	15,366	10,078
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	0
Fair Value	15,366	10,078
Continuous Unrealized Loss Position less than 12 Months	0	0
Continuous Unrealized Loss Position greater than 12 Months	0	0
Short-term \| Municipal securities
Available-for-sale
Amortized Cost	29,862	211,791
Gross Unrealized Holding Gains	0	60
Gross Unrealized Holding Losses	29	612
Fair Value	29,833	211,239
Continuous Unrealized Loss Position less than 12 Months	29	612
Continuous Unrealized Loss Position greater than 12 Months	0	0
Short-term \| U.S. government agency securities
Available-for-sale
Amortized Cost	153,356	109,697
Gross Unrealized Holding Gains	8	3
Gross Unrealized Holding Losses	311	715
Fair Value	153,053	108,985
Continuous Unrealized Loss Position less than 12 Months	311	715
Continuous Unrealized Loss Position greater than 12 Months	0	0
Short-term \| U.S. treasuries
Available-for-sale
Amortized Cost	536,966	838,825
Gross Unrealized Holding Gains	9	17
Gross Unrealized Holding Losses	1,234	4,539
Fair Value	535,741	834,303
Continuous Unrealized Loss Position less than 12 Months	1,234	4,539
Continuous Unrealized Loss Position greater than 12 Months	0	0
Short-term \| Corporate bonds
Available-for-sale
Amortized Cost	233,328
Gross Unrealized Holding Gains	5
Gross Unrealized Holding Losses	574
Fair Value	232,759
Continuous Unrealized Loss Position less than 12 Months	574
Continuous Unrealized Loss Position greater than 12 Months	0
Long-term \| U.S. government agency securities
Available-for-sale
Amortized Cost	11,489	2,016
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	12	3
Fair Value	11,477	2,013
Continuous Unrealized Loss Position less than 12 Months	12	3
Continuous Unrealized Loss Position greater than 12 Months	0	0
Long-term \| U.S. treasuries
Available-for-sale
Amortized Cost	30,364	53,215
Gross Unrealized Holding Gains	3	20
Gross Unrealized Holding Losses	29	71
Fair Value	30,338	53,164
Continuous Unrealized Loss Position less than 12 Months	29	71
Continuous Unrealized Loss Position greater than 12 Months	0	0
Long-term \| Corporate bonds
Available-for-sale
Amortized Cost	10,845
Gross Unrealized Holding Gains	0
Gross Unrealized Holding Losses	24
Fair Value	10,821
Continuous Unrealized Loss Position less than 12 Months	24
Continuous Unrealized Loss Position greater than 12 Months	$ 0
Long-term \| Variable rate demand notes
Available-for-sale
Amortized Cost		6,266
Gross Unrealized Holding Gains		0
Gross Unrealized Holding Losses		0
Fair Value		6,266
Continuous Unrealized Loss Position less than 12 Months		0
Continuous Unrealized Loss Position greater than 12 Months		$ 0

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).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
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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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