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INVESTMENTS - Maturity Period (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Investments
Amortized Cost	$ 263,665	$ 320,740
Fair Value	263,697	320,650
Commercial paper | Less than 1 year
Investments
Amortized Cost	38,964	52,838
Fair Value	38,964	52,838
Municipal securities | Less than 1 year
Investments
Amortized Cost	103,664	151,690
Fair Value	103,690	151,644
U.S. government agency securities | Less than 1 year
Investments
Amortized Cost	19,940	19,943
Fair Value	19,945	19,931
Certificates of deposit | Less than 1 year
Investments
Amortized Cost	5,024	14,075
Fair Value	5,024	14,075
U.S. treasuries | Less than 1 year
Investments
Amortized Cost	89,267	78,189
Fair Value	89,268	78,157
Variable rate demand notes | Due 21 - 30 years
Investments
Amortized Cost	5,805	4,005
Fair Value	5,805	$ 4,005
Variable rate demand notes | Due 31 - 40 years
Investments
Amortized Cost	1,001
Fair Value	$ 1,001

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.

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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
-Paragraph 1
-Subparagraph (SX 210.9-03(5))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-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

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558

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-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1))
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