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INVESTMENTS - Major Type - Maturity Period (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Investments |  |
Amortized Cost | $ 209,904 | $ 223,144
Fair Value | 209,843 | 222,948
Commercial paper | Less than 1 year |  |
Investments |  |
Amortized Cost | 50,623 | 40,382
Fair Value | 50,623 | 40,382
Certificates of deposit | Less than 1 year |  |
Investments |  |
Amortized Cost | 3,164 |
Fair Value | 3,164 |
Municipal securities | Less than 1 year |  |
Investments |  |
Amortized Cost | 119,833 | 140,379
Fair Value | 119,779 | 140,198
Municipal securities | Due 1 - 10 years |  |
Investments |  |
Amortized Cost | 478 | 2,403
Fair Value | 477 | 2,394
U.S. government agency securities | Less than 1 year |  |
Investments |  |
Amortized Cost | 10,076 | 26,057
Fair Value | 10,070 | 26,051
Variable rate demand notes | Due 1 - 10 years |  |
Investments |  |
Amortized Cost | 3,917 | 3,917
Fair Value | 3,917 | 3,917
Variable rate demand notes | Due 11 - 20 years |  |
Investments |  |
Amortized Cost | 13,808 | 6,003
Fair Value | 13,808 | 6,003
Variable rate demand notes | Due 21 - 30 years |  |
Investments |  |
Amortized Cost | 4,002 | 4,003
Fair Value | 4,002 | $ 4,003
Variable rate demand notes | Due 31 - 40 years |  |
Investments |  |
Amortized Cost | 4,003 |
Fair Value | $ 4,003 |

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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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