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INVESTMENTS (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Available-for-sale |  |
Amortized Cost | $ 1,060,060 | $ 925,559
Gross Unrealized Holding Gains | 47 | 165
Gross Unrealized Holding Losses | 122 | 79
Fair Value | 1,059,985 | 925,645
Continuous Unrealized Loss Position less than 12 Months | 122 | 79
Short-term | Commercial paper |  |
Available-for-sale |  |
Amortized Cost | 186,912 | 119,886
Fair Value | 186,912 | 119,886
Short-term | Certificates of deposit |  |
Available-for-sale |  |
Amortized Cost | 43,240 | 20,387
Gross Unrealized Holding Gains | 2 |
Fair Value | 43,242 | 20,387
Short-term | Municipal securities |  |
Available-for-sale |  |
Amortized Cost |  | 9,083
Fair Value |  | 9,083
Short-term | U.S. government agency securities |  |
Available-for-sale |  |
Amortized Cost | 64,914 | 81,521
Gross Unrealized Holding Gains | 10 | 13
Gross Unrealized Holding Losses | 2 | 3
Fair Value | 64,922 | 81,531
Continuous Unrealized Loss Position less than 12 Months | 2 | 3
Short-term | U.S. treasuries |  |
Available-for-sale |  |
Amortized Cost | 673,912 | 650,386
Gross Unrealized Holding Gains | 35 | 150
Gross Unrealized Holding Losses | 71 | 69
Fair Value | 673,876 | 650,467
Continuous Unrealized Loss Position less than 12 Months | 71 | 69
Long-term | U.S. government agency securities |  |
Available-for-sale |  |
Amortized Cost | 29,659 | 10,350
Gross Unrealized Holding Gains |  | 1
Gross Unrealized Holding Losses | 8 |
Fair Value | 29,651 | 10,351
Continuous Unrealized Loss Position less than 12 Months | 8 |
Long-term | U.S. treasuries |  |
Available-for-sale |  |
Amortized Cost | 61,423 | 33,946
Gross Unrealized Holding Gains |  | 1
Gross Unrealized Holding Losses | 41 | 7
Fair Value | 61,382 | 33,940
Continuous Unrealized Loss Position less than 12 Months | $ 41 | $ 7

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