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INVESTMENTS - Maturity Period (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Investments
Amortized Cost	$ 364,747	$ 320,740
Fair Value	364,994	320,650
Commercial paper | Less than 1 year
Investments
Amortized Cost	63,286	52,838
Fair Value	63,286	52,838
Municipal securities | Less than 1 year
Investments
Amortized Cost	104,230	151,690
Fair Value	104,307	151,644
Municipal securities | Due 1 - 10 years
Investments
Amortized Cost	6,992
Fair Value	7,006
U.S. government agency securities | Less than 1 year
Investments
Amortized Cost	20,430	19,943
Fair Value	20,447	19,931
Certificates of deposit | Less than 1 year
Investments
Amortized Cost	15,026	14,075
Fair Value	15,026	14,075
U.S. treasuries | Less than 1 year
Investments
Amortized Cost	131,508	78,189
Fair Value	131,647	78,157
Variable rate demand notes | Due 1 - 10 years
Investments
Amortized Cost	2,442
Fair Value	2,442
Variable rate demand notes | Due 11 - 20 years
Investments
Amortized Cost	17,924
Fair Value	17,924
Variable rate demand notes | Due 21 - 30 years
Investments
Amortized Cost	2,909	4,005
Fair Value	$ 2,909	$ 4,005

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 http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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