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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Level 1 |  |
Fair value of certain assets |  |
Cash | $ 89,680 | $ 147,113
Assets measured at fair value | 262,866 | 211,087
Level 1 | Money market funds |  |
Fair value of certain assets |  |
Assets measured at fair value | 173,186 | 63,974
Level 2 |  |
Fair value of certain assets |  |
Assets measured at fair value | 163,361 | 106,706
Level 2 | U.S. Treasuries |  |
Fair value of certain assets |  |
Assets measured at fair value | 11,019 | 24,065
Level 2 | Certificates of deposit |  |
Fair value of certain assets |  |
Assets measured at fair value | 11,515 | 5,603
Level 2 | Municipal securities |  |
Fair value of certain assets |  |
Assets measured at fair value | 140,827 | 77,038
Level 3 |  |
Fair value of certain assets |  |
Assets measured at fair value | 19,448 | 25,085
Level 3 | Auction rate securities |  |
Fair value of certain assets |  |
Assets measured at fair value | 17,762 | 23,156
Level 3 | Put option related to auction rate securities |  |
Fair value of certain assets |  |
Assets measured at fair value | 1,686 | 1,929
Total fair value |  |
Fair value of certain assets |  |
Cash | 89,680 | 147,113
Assets measured at fair value | 445,675 | 342,878
Total fair value | Money market funds |  |
Fair value of certain assets |  |
Assets measured at fair value | 173,186 | 63,974
Total fair value | U.S. Treasuries |  |
Fair value of certain assets |  |
Assets measured at fair value | 11,019 | 24,065
Total fair value | Certificates of deposit |  |
Fair value of certain assets |  |
Assets measured at fair value | 11,515 | 5,603
Total fair value | Municipal securities |  |
Fair value of certain assets |  |
Assets measured at fair value | 140,827 | 77,038
Total fair value | Auction rate securities |  |
Fair value of certain assets |  |
Assets measured at fair value | 17,762 | 23,156
Total fair value | Put option related to auction rate securities |  |
Fair value of certain assets |  |
Assets measured at fair value | $ 1,686 | $ 1,929

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + 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=7578670&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 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 + Details
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