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INVESTMENTS (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Available-for-sale |  |
Amortized Cost | $ 1,427,954 | $ 1,850,101
Gross Unrealized Holding Gains | 5 | 2
Gross Unrealized Holding Losses | 8,805 | 957
Fair Value | 1,419,154 | 1,849,146
Continuous Unrealized Loss Position less than 12 Months | 8,805 | 957
Short-term | Commercial paper |  |
Available-for-sale |  |
Amortized Cost | 218,573 | 334,077
Gross Unrealized Holding Losses | 7 |
Fair Value | 218,566 | 334,077
Continuous Unrealized Loss Position less than 12 Months | 7 |
Short-term | Certificates of deposit |  |
Available-for-sale |  |
Amortized Cost | 20,035 | 44,502
Fair Value | 20,035 | 44,502
Short-term | Municipal securities |  |
Available-for-sale |  |
Amortized Cost | 193,567 | 666
Gross Unrealized Holding Gains | 4 |
Gross Unrealized Holding Losses | 1,142 |
Fair Value | 192,429 | 666
Continuous Unrealized Loss Position less than 12 Months | 1,142 |
Short-term | U.S. government agency securities |  |
Available-for-sale |  |
Amortized Cost | 88,573 | 62,687
Gross Unrealized Holding Losses | 851 | 26
Fair Value | 87,722 | 62,661
Continuous Unrealized Loss Position less than 12 Months | 851 | 26
Short-term | U.S. treasuries |  |
Available-for-sale |  |
Amortized Cost | 834,249 | 1,308,536
Gross Unrealized Holding Gains |  | 2
Gross Unrealized Holding Losses | 6,220 | 717
Fair Value | 828,029 | 1,307,821
Continuous Unrealized Loss Position less than 12 Months | 6,220 | 717
Long-term | Municipal securities |  |
Available-for-sale |  |
Amortized Cost | 5,562 |
Gross Unrealized Holding Losses | 35 |
Fair Value | 5,527 |
Continuous Unrealized Loss Position less than 12 Months | 35 |
Long-term | U.S. government agency securities |  |
Available-for-sale |  |
Amortized Cost | 11,711 | 12,500
Gross Unrealized Holding Gains | 1 |
Gross Unrealized Holding Losses | 74 | 24
Fair Value | 11,638 | 12,476
Continuous Unrealized Loss Position less than 12 Months | 74 | 24
Long-term | U.S. treasuries |  |
Available-for-sale |  |
Amortized Cost | 55,684 | 87,133
Gross Unrealized Holding Losses | 476 | 190
Fair Value | 55,208 | 86,943
Continuous Unrealized Loss Position less than 12 Months | $ 476 | $ 190

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