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INVESTMENTS (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Available-for-sale
Amortized Cost	$ 1,032,810	$ 1,429,600
Gross Unrealized Holding Gains	546	101
Gross Unrealized Holding Losses	1,320	5,944
Fair Value	1,032,036	1,423,757
Continuous Unrealized Loss Position less than 12 Months	1,320	5,944
Continuous Unrealized Loss Position greater than 12 Months	0	0
Short-term | Commercial paper
Available-for-sale
Amortized Cost	163,775	197,712
Gross Unrealized Holding Gains	0	1
Gross Unrealized Holding Losses	1	4
Fair Value	163,774	197,709
Continuous Unrealized Loss Position less than 12 Months	1	4
Continuous Unrealized Loss Position greater than 12 Months	0	0
Short-term | Certificates of deposit
Available-for-sale
Amortized Cost	15,590	10,078
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	0
Fair Value	15,590	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	361	211,791
Gross Unrealized Holding Gains	0	60
Gross Unrealized Holding Losses	0	612
Fair Value	361	211,239
Continuous Unrealized Loss Position less than 12 Months	0	612
Continuous Unrealized Loss Position greater than 12 Months	0	0
Short-term | U.S. government agency securities
Available-for-sale
Amortized Cost	116,524	109,697
Gross Unrealized Holding Gains	90	3
Gross Unrealized Holding Losses	66	715
Fair Value	116,548	108,985
Continuous Unrealized Loss Position less than 12 Months	66	715
Continuous Unrealized Loss Position greater than 12 Months	0	0
Short-term | U.S. treasuries
Available-for-sale
Amortized Cost	412,936	838,825
Gross Unrealized Holding Gains	205	17
Gross Unrealized Holding Losses	1,084	4,539
Fair Value	412,057	834,303
Continuous Unrealized Loss Position less than 12 Months	1,084	4,539
Continuous Unrealized Loss Position greater than 12 Months	0	0
Short-term | Corporate bonds
Available-for-sale
Amortized Cost	247,340
Gross Unrealized Holding Gains	89
Gross Unrealized Holding Losses	154
Fair Value	247,275
Continuous Unrealized Loss Position less than 12 Months	154
Continuous Unrealized Loss Position greater than 12 Months	0
Long-term | U.S. government agency securities
Available-for-sale
Amortized Cost	23,485	2,016
Gross Unrealized Holding Gains	51	0
Gross Unrealized Holding Losses	5	3
Fair Value	23,531	2,013
Continuous Unrealized Loss Position less than 12 Months	5	3
Continuous Unrealized Loss Position greater than 12 Months	0	0
Long-term | U.S. treasuries
Available-for-sale
Amortized Cost	35,896	53,215
Gross Unrealized Holding Gains	79	20
Gross Unrealized Holding Losses	8	71
Fair Value	35,967	53,164
Continuous Unrealized Loss Position less than 12 Months	8	71
Continuous Unrealized Loss Position greater than 12 Months	0	0
Long-term | Corporate bonds
Available-for-sale
Amortized Cost	16,903
Gross Unrealized Holding Gains	32
Gross Unrealized Holding Losses	2
Fair Value	16,933
Continuous Unrealized Loss Position less than 12 Months	2
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

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- Definition

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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