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INVESTMENTS - Maturity Period (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Investments
Amortized Cost	$ 320,740	$ 676,129
Fair Value	320,650	675,299
Commercial paper | Less than 1 year
Investments
Amortized Cost	52,838	81,026
Fair Value	52,838	81,026
Municipal securities | Less than 1 year
Investments
Amortized Cost	151,690	469,604
Fair Value	151,644	468,865
U.S. government agency securities | Less than 1 year
Investments
Amortized Cost	19,943	61,307
Fair Value	19,931	61,219
U.S. government agency securities | Due 1 - 10 years
Investments
Amortized Cost		2,369
Fair Value		2,366
Certificates of deposit | Less than 1 year
Investments
Amortized Cost	14,075	11,869
Fair Value	14,075	11,869
U.S. Treasuries | Less than 1 year
Investments
Amortized Cost	78,189
Fair Value	78,157
Variable rate demand notes | Due 1 - 10 years
Investments
Amortized Cost		6,366
Fair Value		6,366
Variable rate demand notes | Due 11 - 20 years
Investments
Amortized Cost		28,377
Fair Value		28,377
Variable rate demand notes | Due 21 - 30 years
Investments
Amortized Cost	4,005	15,211
Fair Value	$ 4,005	$ 15,211

X

- Definition

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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(12))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 35
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82895926&loc=d3e24584-111560

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-Name Accounting Standards Codification
-Topic 210
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