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INVESTMENTS (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Available-for-sale |  |
Amortized Cost | $ 1,788,306 | $ 1,850,101
Gross Unrealized Holding Gains | 2 | 2
Gross Unrealized Holding Losses | 5,008 | 957
Fair Value | 1,783,300 | 1,849,146
Continuous Unrealized Loss Position less than 12 Months | 5,008 | 957
Short-term | Commercial paper |  |
Available-for-sale |  |
Amortized Cost | 276,413 | 334,077
Fair Value | 276,413 | 334,077
Short-term | Certificates of deposit |  |
Available-for-sale |  |
Amortized Cost | 37,010 | 44,502
Fair Value | 37,010 | 44,502
Short-term | Municipal securities |  |
Available-for-sale |  |
Amortized Cost | 168,958 | 666
Gross Unrealized Holding Gains | 2 |
Gross Unrealized Holding Losses | 482 |
Fair Value | 168,478 | 666
Continuous Unrealized Loss Position less than 12 Months | 482 |
Short-term | U.S. government agency securities |  |
Available-for-sale |  |
Amortized Cost | 78,831 | 62,687
Gross Unrealized Holding Losses | 342 | 26
Fair Value | 78,489 | 62,661
Continuous Unrealized Loss Position less than 12 Months | 342 | 26
Short-term | U.S. treasuries |  |
Available-for-sale |  |
Amortized Cost | 1,161,042 | 1,308,536
Gross Unrealized Holding Gains |  | 2
Gross Unrealized Holding Losses | 3,784 | 717
Fair Value | 1,157,258 | 1,307,821
Continuous Unrealized Loss Position less than 12 Months | 3,784 | 717
Long-term | Municipal securities |  |
Available-for-sale |  |
Amortized Cost | 5,284 |
Gross Unrealized Holding Losses | 18 |
Fair Value | 5,266 |
Continuous Unrealized Loss Position less than 12 Months | 18 |
Long-term | U.S. government agency securities |  |
Available-for-sale |  |
Amortized Cost | 21,455 | 12,500
Gross Unrealized Holding Losses | 158 | 24
Fair Value | 21,297 | 12,476
Continuous Unrealized Loss Position less than 12 Months | 158 | 24
Long-term | U.S. treasuries |  |
Available-for-sale |  |
Amortized Cost | 39,313 | 87,133
Gross Unrealized Holding Losses | 224 | 190
Fair Value | 39,089 | 86,943
Continuous Unrealized Loss Position less than 12 Months | $ 224 | $ 190

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