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FAIR VALUE OF CERTAIN FINANCIAL ASSETS AND LIABILITIES (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Level 1 |  |
Fair value of certain assets |  |
Cash | $ 218,121 | $ 139,300
Assets measured at fair value | 352,399 | 199,402
Level 1 | Money market funds |  |
Fair value of certain assets |  |
Assets measured at fair value | 134,278 | 60,102
Level 2 |  |
Fair value of certain assets |  |
Foreign currency derivatives | 38 |
Assets measured at fair value | 513,522 | 407,802
Level 2 | Certificates of deposit |  |
Fair value of certain assets |  |
Assets measured at fair value | 6,007 | 22,045
Level 2 | Commercial paper |  |
Fair value of certain assets |  |
Assets measured at fair value | 9,996 | 5,991
Level 2 | Municipal securities |  |
Fair value of certain assets |  |
Assets measured at fair value | 497,481 | 379,766
Level 3 |  |
Fair value of certain assets |  |
Assets measured at fair value | 13,813 | 17,276
Level 3 | Auction rate securities |  |
Fair value of certain assets |  |
Assets measured at fair value | 12,819 | 16,184
Level 3 | Put option related to auction rate securities |  |
Fair value of certain assets |  |
Assets measured at fair value | 994 | 1,092
Total fair value |  |
Fair value of certain assets |  |
Cash | 218,121 | 139,300
Foreign currency derivatives | 38 |
Assets measured at fair value | 879,734 | 624,480
Total fair value | Money market funds |  |
Fair value of certain assets |  |
Assets measured at fair value | 134,278 | 60,102
Total fair value | Certificates of deposit |  |
Fair value of certain assets |  |
Assets measured at fair value | 6,007 | 22,045
Total fair value | Commercial paper |  |
Fair value of certain assets |  |
Assets measured at fair value | 9,996 | 5,991
Total fair value | Municipal securities |  |
Fair value of certain assets |  |
Assets measured at fair value | 497,481 | 379,766
Total fair value | Auction rate securities |  |
Fair value of certain assets |  |
Assets measured at fair value | 12,819 | 16,184
Total fair value | Put option related to auction rate securities |  |
Fair value of certain assets |  |
Assets measured at fair value | $ 994 | $ 1,092

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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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- Definition Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities on the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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