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INVESTMENTS - Major Type - Maturity Period (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Investments |  |
Amortized Cost | $ 515,662 | $ 759,958
Fair Value | 515,523 | 759,725
Commercial paper | Less than 1 year |  |
Investments |  |
Amortized Cost | 7,969 | 3,978
Fair Value | 7,969 | 3,978
Municipal securities | Less than 1 year |  |
Investments |  |
Amortized Cost | 464,865 | 709,207
Fair Value | 464,739 | 709,078
Municipal securities | Due 1 - 10 years |  |
Investments |  |
Amortized Cost | 5,334 | 11,071
Fair Value | 5,328 | 11,063
Municipal securities | Due 11 - 20 years |  |
Investments |  |
Amortized Cost | 2,085 |
Fair Value | 2,083 |
U.S. government agency securities | Less than 1 year |  |
Investments |  |
Amortized Cost | 17,316 | 23,369
Fair Value | 17,310 | 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 | 18,093 | 8,056
Fair Value | $ 18,094 | $ 8,043

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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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