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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 |

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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 + Details
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