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INVESTMENTS (Details 2) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Investments
Amortized Cost	$ 1,579,065	$ 824,074
Fair Value	1,579,407	824,186
Commercial paper | Less than 1 year
Investments
Amortized Cost	306,858	19,482
Fair Value	306,858	19,480
U.S. Treasuries | Less than 1 year
Investments
Amortized Cost	92,994
Fair Value	92,999
Certificates of deposit | Less than 1 year
Investments
Amortized Cost	44,506
Fair Value	44,506
Municipal securities | Less than 1 year
Investments
Amortized Cost	611,370	744,542
Fair Value	611,679	744,647
Municipal securities | Due 1 - 10 years
Investments
Amortized Cost	29,333	42,940
Fair Value	29,345	42,950
U.S. government agency securities
Investments
Amortized Cost	5,022
Fair Value	5,019
U.S. government agency securities | Less than 1 year
Investments
Amortized Cost	487,495	9,199
Fair Value	487,514	9,198
Auction rate securities | Due 11 - 20 years
Investments
Amortized Cost	1,487	3,910
Fair Value	$ 1,487	3,910
Variable rate demand notes | Due 21 - 30 years
Investments
Amortized Cost		4,001
Fair Value		$ 4,001

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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- 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=28360136&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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