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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

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