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INVESTMENTS - Maturity Period (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Investments
Amortized Cost	$ 637,472	$ 223,144
Fair Value	637,351	222,948
Commercial paper | Less than 1 year
Investments
Amortized Cost	66,344	40,382
Fair Value	66,344	40,382
Certificates of deposit | Less than 1 year
Investments
Amortized Cost	50,677
Fair Value	50,677
Municipal securities | Less than 1 year
Investments
Amortized Cost	402,062	140,379
Fair Value	401,977	140,198
Municipal securities | Due 1 - 10 years
Investments
Amortized Cost	2,010	2,403
Fair Value	2,007	2,394
U.S. government agency securities | Less than 1 year
Investments
Amortized Cost	53,342	26,057
Fair Value	53,315	26,051
U.S. government agency securities | Due 1 - 10 years
Investments
Amortized Cost	5,001
Fair Value	4,996
U.S. Treasuries | Less than 1 year
Investments
Amortized Cost	11,982
Fair Value	11,981
Variable rate demand notes | Due 1 - 10 years
Investments
Amortized Cost	6,664	3,917
Fair Value	6,664	3,917
Variable rate demand notes | Due 11 - 20 years
Investments
Amortized Cost	26,016	6,003
Fair Value	26,016	6,003
Variable rate demand notes | Due 21 - 30 years
Investments
Amortized Cost	13,374	4,003
Fair Value	$ 13,374	$ 4,003

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
-Glossary Trading Securities
-URI http://asc.fasb.org/extlink&oid=6526789

Reference 3: 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 4: 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(6))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 5: 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=27723805&loc=d3e24584-111560

Reference 6: 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(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Available-for-Sale Securities
-URI http://asc.fasb.org/extlink&oid=6505594

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