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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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