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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Level 1 |  |
Fair value of certain assets |  |
Cash | $ 139,300 | $ 147,113
Assets measured at fair value | 199,402 | 211,087
Level 1 | Money market funds |  |
Fair value of certain assets |  |
Assets measured at fair value | 60,102 | 63,974
Level 2 |  |
Fair value of certain assets |  |
Assets measured at fair value | 407,802 | 106,706
Level 2 | U.S. Treasuries |  |
Fair value of certain assets |  |
Assets measured at fair value |  | 24,065
Level 2 | Certificates of deposit |  |
Fair value of certain assets |  |
Assets measured at fair value | 22,045 | 5,603
Level 2 | Commercial paper |  |
Fair value of certain assets |  |
Assets measured at fair value | 5,991 |
Level 2 | Municipal securities |  |
Fair value of certain assets |  |
Assets measured at fair value | 379,766 | 77,038
Level 3 |  |
Fair value of certain assets |  |
Assets measured at fair value | 17,276 | 25,085
Level 3 | Auction rate securities |  |
Fair value of certain assets |  |
Assets measured at fair value | 16,184 | 23,156
Level 3 | Put option related to auction rate securities |  |
Fair value of certain assets |  |
Assets measured at fair value | 1,092 | 1,929
Total fair value |  |
Fair value of certain assets |  |
Cash | 139,300 | 147,113
Assets measured at fair value | 624,480 | 342,878
Total fair value | Money market funds |  |
Fair value of certain assets |  |
Assets measured at fair value | 60,102 | 63,974
Total fair value | U.S. Treasuries |  |
Fair value of certain assets |  |
Assets measured at fair value |  | 24,065
Total fair value | Certificates of deposit |  |
Fair value of certain assets |  |
Assets measured at fair value | 22,045 | 5,603
Total fair value | Commercial paper |  |
Fair value of certain assets |  |
Assets measured at fair value | 5,991 |
Total fair value | Municipal securities |  |
Fair value of certain assets |  |
Assets measured at fair value | 379,766 | 77,038
Total fair value | Auction rate securities |  |
Fair value of certain assets |  |
Assets measured at fair value | 16,184 | 23,156
Total fair value | Put option related to auction rate securities |  |
Fair value of certain assets |  |
Assets measured at fair value | $ 1,092 | $ 1,929

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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