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INVESTMENTS - Maturity Period (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Investments
Amortized Cost	$ 252,173	$ 545,771
Fair Value	252,830	545,968
Commercial paper | Less than 1 year
Investments
Amortized Cost	58,540	83,478
Fair Value	58,540	83,478
Municipal securities | Less than 1 year
Investments
Amortized Cost		147,983
Fair Value		148,108
Municipal securities | Due 1 - 10 years
Investments
Amortized Cost		1,562
Fair Value		1,561
U.S. government agency securities | Less than 1 year
Investments
Amortized Cost	44,851	40,620
Fair Value	44,883	40,590
U.S. government agency securities | Due 1 - 10 years
Investments
Amortized Cost		5,267
Fair Value		5,266
Certificates of deposit | Less than 1 year
Investments
Amortized Cost	3,624	28,049
Fair Value	3,624	28,049
U.S. treasuries | Less than 1 year
Investments
Amortized Cost	143,081	211,055
Fair Value	143,706	211,158
U.S. treasuries | Due 1 - 10 years
Investments
Amortized Cost	2,077	6,077
Fair Value	$ 2,077	6,078
Variable rate demand notes | Due 1 - 10 years
Investments
Amortized Cost		3,905
Fair Value		3,905
Variable rate demand notes | Due 11 - 20 years
Investments
Amortized Cost		8,886
Fair Value		8,886
Variable rate demand notes | Due 21 - 30 years
Investments
Amortized Cost		6,885
Fair Value		6,885
Variable rate demand notes | Due 31 - 40 years
Investments
Amortized Cost		2,004
Fair Value		$ 2,004

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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

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