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INVESTMENTS - Maturity Period (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Investments |  |
Amortized Cost | $ 1,427,954 | $ 1,850,101
Fair Value | 1,419,154 | 1,849,146
Commercial paper | Less than 1 year |  |
Investments |  |
Amortized Cost | 218,573 | 334,077
Fair Value | 218,566 | 334,077
Municipal securities | Less than 1 year |  |
Investments |  |
Amortized Cost | 193,567 | 666
Fair Value | 192,429 | 666
Municipal securities | Due 1 - 10 years |  |
Investments |  |
Amortized Cost | 5,562 | 0
Fair Value | 5,527 | 0
U.S. government agency securities | Less than 1 year |  |
Investments |  |
Amortized Cost | 88,573 | 62,687
Fair Value | 87,722 | 62,661
U.S. government agency securities | Due 1 - 10 years |  |
Investments |  |
Amortized Cost | 11,711 | 12,500
Fair Value | 11,638 | 12,476
Certificates of deposit | Less than 1 year |  |
Investments |  |
Amortized Cost | 20,035 | 44,502
Fair Value | 20,035 | 44,502
U.S. treasuries | Less than 1 year |  |
Investments |  |
Amortized Cost | 834,249 | 1,308,536
Fair Value | 828,029 | 1,307,821
U.S. treasuries | Due 1 - 10 years |  |
Investments |  |
Amortized Cost | 55,684 | 87,133
Fair Value | $ 55,208 | $ 86,943

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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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