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INVESTMENTS - Maturity Period (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
INVESTMENTS
Amortized Cost	$ 1,426,842	$ 1,429,600
Fair Value	1,424,180	1,423,757
Commercial paper | Less than 1 year
INVESTMENTS
Amortized Cost	296,708	197,712
Fair Value	296,708	197,710
Municipal securities | Less than 1 year
INVESTMENTS
Amortized Cost	129,779	211,791
Fair Value	129,574	211,239
Corporate bonds | Less than 1 year
INVESTMENTS
Amortized Cost	72,536
Fair Value	72,429
Corporate bonds | Due 1 - 10 years
INVESTMENTS
Amortized Cost	1,753
Fair Value	1,751
U.S. government agency securities | Less than 1 year
INVESTMENTS
Amortized Cost	129,605	109,697
Fair Value	129,308	108,985
U.S. government agency securities | Due 1 - 10 years
INVESTMENTS
Amortized Cost	10,432	2,016
Fair Value	10,430	2,013
Certificates of deposit | Less than 1 year
INVESTMENTS
Amortized Cost	12,630	10,078
Fair Value	12,630	10,078
U.S. treasuries | Less than 1 year
INVESTMENTS
Amortized Cost	744,403	838,825
Fair Value	742,379	834,302
U.S. treasuries | Due 1 - 10 years
INVESTMENTS
Amortized Cost	28,996	53,215
Fair Value	$ 28,971	53,164
Variable rate demand notes | Due 1 - 10 years
INVESTMENTS
Amortized Cost		4,862
Fair Value		4,862
Variable rate demand notes | Due 11 - 20 years
INVESTMENTS
Amortized Cost		1,404
Fair Value		$ 1,404

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

No definition available.

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- Definition

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+ 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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