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INVESTMENTS (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Available-for-sale |  |
Amortized Cost | $ 1,429,600 | $ 1,850,101
Gross Unrealized Holding Gains | 101 | 2
Gross Unrealized Holding Losses | 5,944 | 957
Fair Value | 1,423,757 | 1,849,146
Continuous Unrealized Loss Position less than 12 Months | 5,944 | 957
Short-term | Commercial paper |  |
Available-for-sale |  |
Amortized Cost | 197,712 | 334,077
Gross Unrealized Holding Gains | 1 |
Gross Unrealized Holding Losses | 4 |
Fair Value | 197,709 | 334,077
Continuous Unrealized Loss Position less than 12 Months | 4 |
Short-term | Certificates of deposit |  |
Available-for-sale |  |
Amortized Cost | 10,078 | 44,502
Fair Value | 10,078 | 44,502
Short-term | Municipal securities |  |
Available-for-sale |  |
Amortized Cost | 211,791 | 666
Gross Unrealized Holding Gains | 60 |
Gross Unrealized Holding Losses | 612 |
Fair Value | 211,239 | 666
Continuous Unrealized Loss Position less than 12 Months | 612 |
Short-term | U.S. government agency securities |  |
Available-for-sale |  |
Amortized Cost | 109,697 | 62,687
Gross Unrealized Holding Gains | 3 |
Gross Unrealized Holding Losses | 715 | 26
Fair Value | 108,985 | 62,661
Continuous Unrealized Loss Position less than 12 Months | 715 | 26
Short-term | U.S. treasuries |  |
Available-for-sale |  |
Amortized Cost | 838,825 | 1,308,536
Gross Unrealized Holding Gains | 17 | 2
Gross Unrealized Holding Losses | 4,539 | 717
Fair Value | 834,303 | 1,307,821
Continuous Unrealized Loss Position less than 12 Months | 4,539 | 717
Long-term | U.S. government agency securities |  |
Available-for-sale |  |
Amortized Cost | 2,016 | 12,500
Gross Unrealized Holding Losses | 3 | 24
Fair Value | 2,013 | 12,476
Continuous Unrealized Loss Position less than 12 Months | 3 | 24
Long-term | U.S. treasuries |  |
Available-for-sale |  |
Amortized Cost | 53,215 | 87,133
Gross Unrealized Holding Gains | 20 |
Gross Unrealized Holding Losses | 71 | 190
Fair Value | 53,164 | 86,943
Continuous Unrealized Loss Position less than 12 Months | 71 | $ 190
Long-term | Variable rate demand notes |  |
Available-for-sale |  |
Amortized Cost | 6,266 |
Fair Value | $ 6,266 |

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