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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

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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 + Details
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