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INVESTMENTS - Maturity Period (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Investments |  |
Amortized Cost | $ 1,408,025 | $ 1,850,101
Fair Value | 1,401,911 | 1,849,146
Commercial paper | Less than 1 year |  |
Investments |  |
Amortized Cost | 208,909 | 334,077
Fair Value | 208,909 | 334,077
Municipal securities | Less than 1 year |  |
Investments |  |
Amortized Cost | 212,828 | 666
Fair Value | 212,444 | 666
Municipal securities | Due 1 - 10 years |  |
Investments |  |
Amortized Cost | 1,263 |
Fair Value | 1,265 |
U.S. government agency securities | Less than 1 year |  |
Investments |  |
Amortized Cost | 74,583 | 62,687
Fair Value | 74,059 | 62,661
U.S. government agency securities | Due 1 - 10 years |  |
Investments |  |
Amortized Cost | 6,417 | 12,500
Fair Value | 6,385 | 12,476
Certificates of deposit | Less than 1 year |  |
Investments |  |
Amortized Cost | 34,554 | 44,502
Fair Value | 34,554 | 44,502
U.S. treasuries | Less than 1 year |  |
Investments |  |
Amortized Cost | 812,871 | 1,308,536
Fair Value | 807,826 | 1,307,821
U.S. treasuries | Due 1 - 10 years |  |
Investments |  |
Amortized Cost | 56,600 | 87,133
Fair Value | $ 56,469 | $ 86,943

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