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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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- 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

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