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INVESTMENTS - Major Type - Maturity Period (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Investments |  |
Amortized Cost | $ 759,958 | $ 824,074
Fair Value | 759,725 | 824,186
Commercial paper | Less than 1 year |  |
Investments |  |
Amortized Cost | 3,978 | 19,482
Fair Value | 3,978 | 19,480
Municipal securities | Less than 1 year |  |
Investments |  |
Amortized Cost | 709,207 | 744,542
Fair Value | 709,078 | 744,647
Municipal securities | Due 1 - 10 years |  |
Investments |  |
Amortized Cost | 11,071 | 42,940
Fair Value | 11,063 | 42,950
U.S. government agency securities | Less than 1 year |  |
Investments |  |
Amortized Cost | 23,369 | 9,199
Fair Value | 23,311 | 9,198
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 |
Auction rate securities | Due 11 - 20 years |  |
Investments |  |
Amortized Cost |  | 3,910
Fair Value |  | 3,910
Variable rate demand notes | Due 21 - 30 years |  |
Investments |  |
Amortized Cost |  | 4,001
Fair Value |  | $ 4,001

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- 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. + References No definition available. + Details
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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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