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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

X

- Definition

This item represents the cost of debt and equity securities net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

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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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