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INVESTMENTS - Maturity Period (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Investments
Amortized Cost	$ 1,850,101	$ 925,559
Fair Value	1,849,146	925,645
Commercial paper | Less than 1 year
Investments
Amortized Cost	334,077	119,886
Fair Value	334,077	119,886
Municipal securities | Less than 1 year
Investments
Amortized Cost	666	9,083
Fair Value	666	9,083
U.S. government agency securities | Less than 1 year
Investments
Amortized Cost	62,687	81,521
Fair Value	62,661	81,531
U.S. government agency securities | Due 1 - 10 years
Investments
Amortized Cost	12,500	10,350
Fair Value	12,476	10,351
Certificates of deposit | Less than 1 year
Investments
Amortized Cost	44,502	20,387
Fair Value	44,502	20,387
U.S. treasuries | Less than 1 year
Investments
Amortized Cost	1,308,536	650,386
Fair Value	1,307,821	650,467
U.S. treasuries | Due 1 - 10 years
Investments
Amortized Cost	87,133	33,946
Fair Value	$ 86,943	$ 33,940

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- 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.

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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=123874694&loc=d3e19207-110258

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