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INVESTMENTS (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Available-for-sale |  |
Amortized Cost | $ 1,408,025 | $ 1,850,101
Gross Unrealized Holding Gains | 105 | 2
Gross Unrealized Holding Losses | 6,219 | 957
Fair Value | 1,401,911 | 1,849,146
Continuous Unrealized Loss Position less than 12 Months | 6,219 | 957
Short-term | Commercial paper |  |
Available-for-sale |  |
Amortized Cost | 208,909 | 334,077
Fair Value | 208,909 | 334,077
Short-term | Certificates of deposit |  |
Available-for-sale |  |
Amortized Cost | 34,554 | 44,502
Fair Value | 34,554 | 44,502
Short-term | Municipal securities |  |
Available-for-sale |  |
Amortized Cost | 212,828 | 666
Gross Unrealized Holding Gains | 78 |
Gross Unrealized Holding Losses | 462 |
Fair Value | 212,444 | 666
Continuous Unrealized Loss Position less than 12 Months | 462 |
Short-term | U.S. government agency securities |  |
Available-for-sale |  |
Amortized Cost | 74,583 | 62,687
Gross Unrealized Holding Losses | 524 | 26
Fair Value | 74,059 | 62,661
Continuous Unrealized Loss Position less than 12 Months | 524 | 26
Short-term | U.S. treasuries |  |
Available-for-sale |  |
Amortized Cost | 812,871 | 1,308,536
Gross Unrealized Holding Gains |  | 2
Gross Unrealized Holding Losses | 5,045 | 717
Fair Value | 807,826 | 1,307,821
Continuous Unrealized Loss Position less than 12 Months | 5,045 | 717
Long-term | Municipal securities |  |
Available-for-sale |  |
Amortized Cost | 1,263 |
Gross Unrealized Holding Gains | 2 |
Fair Value | 1,265 |
Long-term | U.S. government agency securities |  |
Available-for-sale |  |
Amortized Cost | 6,417 | 12,500
Gross Unrealized Holding Gains | 1 |
Gross Unrealized Holding Losses | 33 | 24
Fair Value | 6,385 | 12,476
Continuous Unrealized Loss Position less than 12 Months | 33 | 24
Long-term | U.S. treasuries |  |
Available-for-sale |  |
Amortized Cost | 56,600 | 87,133
Gross Unrealized Holding Gains | 24 |
Gross Unrealized Holding Losses | 155 | 190
Fair Value | 56,469 | 86,943
Continuous Unrealized Loss Position less than 12 Months | $ 155 | $ 190

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