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INVESTMENTS (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Available-for-sale
Amortized Cost	$ 1,426,842	$ 1,429,600
Gross Unrealized Holding Gains	226	101
Gross Unrealized Holding Losses	2,888	5,944
Fair Value	1,424,180	1,423,757
Continuous Unrealized Loss Position less than 12 Months	2,888	5,944
Short-term | Commercial paper
Available-for-sale
Amortized Cost	296,708	197,712
Gross Unrealized Holding Gains	1	1
Gross Unrealized Holding Losses	1	4
Fair Value	296,708	197,709
Continuous Unrealized Loss Position less than 12 Months	1	4
Short-term | Certificates of deposit
Available-for-sale
Amortized Cost	12,630	10,078
Fair Value	12,630	10,078
Short-term | Municipal securities
Available-for-sale
Amortized Cost	129,779	211,791
Gross Unrealized Holding Gains	3	60
Gross Unrealized Holding Losses	208	612
Fair Value	129,574	211,239
Continuous Unrealized Loss Position less than 12 Months	208	612
Short-term | Corporate bonds
Available-for-sale
Amortized Cost	72,536
Gross Unrealized Holding Gains	15
Gross Unrealized Holding Losses	122
Fair Value	72,429
Continuous Unrealized Loss Position less than 12 Months	122
Short-term | U.S. government agency securities
Available-for-sale
Amortized Cost	129,605	109,697
Gross Unrealized Holding Gains	35	3
Gross Unrealized Holding Losses	332	715
Fair Value	129,308	108,985
Continuous Unrealized Loss Position less than 12 Months	332	715
Short-term | U.S. treasuries
Available-for-sale
Amortized Cost	744,403	838,825
Gross Unrealized Holding Gains	156	17
Gross Unrealized Holding Losses	2,180	4,539
Fair Value	742,379	834,303
Continuous Unrealized Loss Position less than 12 Months	2,180	4,539
Long-term | Corporate bonds
Available-for-sale
Amortized Cost	1,753
Gross Unrealized Holding Losses	2
Fair Value	1,751
Continuous Unrealized Loss Position less than 12 Months	2
Long-term | U.S. government agency securities
Available-for-sale
Amortized Cost	10,432	2,016
Gross Unrealized Holding Gains	7
Gross Unrealized Holding Losses	9	3
Fair Value	10,430	2,013
Continuous Unrealized Loss Position less than 12 Months	9	3
Long-term | U.S. treasuries
Available-for-sale
Amortized Cost	28,996	53,215
Gross Unrealized Holding Gains	9	20
Gross Unrealized Holding Losses	34	71
Fair Value	28,971	53,164
Continuous Unrealized Loss Position less than 12 Months	$ 34	71
Long-term | Variable rate demand notes
Available-for-sale
Amortized Cost		6,266
Fair Value		$ 6,266

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