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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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