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INVESTMENTS - Major Type - Maturity Period (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Investments
Amortized Cost	$ 267,172	$ 759,958
Fair Value	266,929	759,725
Commercial paper | Less than 1 year
Investments
Amortized Cost	28,318	3,978
Fair Value	28,318	3,978
Municipal securities | Less than 1 year
Investments
Amortized Cost	181,843	709,207
Fair Value	181,621	709,078
Municipal securities | Due 1 - 10 years
Investments
Amortized Cost	9,519	11,071
Fair Value	9,500	11,063
U.S. government agency securities | Less than 1 year
Investments
Amortized Cost	26,080	23,369
Fair Value	26,078	23,311
U.S. government agency securities | Due 1 - 10 years
Investments
Amortized Cost		4,277
Fair Value		4,252
U.S. Treasuries | Less than 1 year
Investments
Amortized Cost		8,056
Fair Value		$ 8,043
Variable rate demand notes | Due 1 - 10 years
Investments
Amortized Cost	6,003
Fair Value	6,003
Variable rate demand notes | Due 11 - 20 years
Investments
Amortized Cost	8,005
Fair Value	8,005
Variable rate demand notes | Due 21 - 30 years
Investments
Amortized Cost	4,002
Fair Value	4,002
Variable rate demand notes | Due 31 - 40 years
Investments
Amortized Cost	3,402
Fair Value	$ 3,402

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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Trading Securities
-URI http://asc.fasb.org/extlink&oid=6526789

Reference 2: 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 3: 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=51813488&loc=d3e22054-111558

Reference 4: 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

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 1
-Subparagraph a, f, g
-Article 7

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