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INVESTMENTS - Maturity Period (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Investments
Amortized Cost	$ 459,730	$ 676,129
Fair Value	459,508	675,299
Commercial paper | Less than 1 year
Investments
Amortized Cost	52,595	81,026
Fair Value	52,595	81,026
U.S. Treasuries | Less than 1 year
Investments
Amortized Cost	109,832
Fair Value	109,787
Municipal securities | Less than 1 year
Investments
Amortized Cost	127,149	469,604
Fair Value	127,069	468,865
Municipal securities | Due 1 - 10 years
Investments
Amortized Cost	1,612
Fair Value	1,610
U.S. government agency securities | Less than 1 year
Investments
Amortized Cost	108,128	61,307
Fair Value	108,033	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	26,068	11,869
Fair Value	26,068	11,869
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	15,952	28,377
Fair Value	15,952	28,377
Variable rate demand notes | Due 21 - 30 years
Investments
Amortized Cost	14,291	15,211
Fair Value	14,291	$ 15,211
Variable rate demand notes | Due 31 - 40 years
Investments
Amortized Cost	4,103
Fair Value	$ 4,103

X

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+ 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
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-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
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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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