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INVESTMENTS - Maturity Period (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Investments |  |
Amortized Cost | $ 1,060,060 | $ 925,559
Fair Value | 1,059,985 | 925,645
Commercial paper | Less than 1 year |  |
Investments |  |
Amortized Cost | 186,912 | 119,886
Fair Value | 186,912 | 119,886
Municipal securities | Less than 1 year |  |
Investments |  |
Amortized Cost |  | 9,083
Fair Value |  | 9,083
U.S. government agency securities | Less than 1 year |  |
Investments |  |
Amortized Cost | 64,914 | 81,521
Fair Value | 64,922 | 81,531
U.S. government agency securities | Due 1 - 10 years |  |
Investments |  |
Amortized Cost | 29,659 | 10,350
Fair Value | 29,651 | 10,351
Certificates of deposit | Less than 1 year |  |
Investments |  |
Amortized Cost | 43,240 | 20,387
Fair Value | 43,242 | 20,387
U.S. treasuries | Less than 1 year |  |
Investments |  |
Amortized Cost | 673,912 | 650,386
Fair Value | 673,876 | 650,467
U.S. treasuries | Due 1 - 10 years |  |
Investments |  |
Amortized Cost | 61,423 | 33,946
Fair Value | $ 61,382 | $ 33,940

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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 http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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