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INVESTMENTS - Maturity Period (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Investments
Amortized Cost	$ 601,447	$ 320,740
Fair Value	601,726	320,650
Commercial paper | Less than 1 year
Investments
Amortized Cost	81,869	52,838
Fair Value	81,869	52,838
Municipal securities | Less than 1 year
Investments
Amortized Cost	138,072	151,690
Fair Value	138,214	151,644
Municipal securities | Due 1 - 10 years
Investments
Amortized Cost	3,198
Fair Value	3,193
U.S. government agency securities | Less than 1 year
Investments
Amortized Cost	41,186	19,943
Fair Value	41,156	19,931
Certificates of deposit | Less than 1 year
Investments
Amortized Cost	2,502	14,075
Fair Value	2,502	14,075
U.S. treasuries | Less than 1 year
Investments
Amortized Cost	294,099	78,189
Fair Value	294,268	78,157
U.S. treasuries | Due 1 - 10 years
Investments
Amortized Cost	11,174
Fair Value	11,177
Variable rate demand notes | Due 1 - 10 years
Investments
Amortized Cost	5,412
Fair Value	5,412
Variable rate demand notes | Due 11 - 20 years
Investments
Amortized Cost	12,197
Fair Value	12,197
Variable rate demand notes | Due 21 - 30 years
Investments
Amortized Cost	9,721	4,005
Fair Value	9,721	$ 4,005
Variable rate demand notes | Due 31 - 40 years
Investments
Amortized Cost	2,017
Fair Value	$ 2,017

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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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