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FAIR VALUE MEASUREMENTS (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  |  |  |  |
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Jun. 30, 2014 | Jun. 30, 2014 | Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] | Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member] | Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] | Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] | Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] | Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member] | Jun. 30, 2014 Reported Value Measurement [Member] | Dec. 31, 2013 Reported Value Measurement [Member] | Jun. 30, 2014 Convertible notes [Member] | Mar. 31, 2014 Convertible notes [Member] | Dec. 31, 2013 Convertible notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure |  |  | $ 27,932 | $ 7,600 | $ 0 | $ 0 | $ 0 | $ 0 | $ 27,932 | $ 7,600 |  |  |
Short Term Investments Fair Value Disclosure |  |  | 215,331 | 202,024 | 0 | 0 | 0 | 0 | 215,331 | 202,024 |  |  |
Long Term Investments Fair Value Disclosure |  |  | 2,522 | 3,117 | 0 | 0 | 0 | 4,300 | 2,522 | 7,417 |  |  |
Rollforward of changes in fair value of investments in convertible notes |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of notes, beginning of period |  |  |  |  |  |  |  |  |  |  | 0 | 300 | 4,300
Repayment of notes | (300) | (4,300) |  |  |  |  |  |  |  |  |  |  |
Fair value of notes, end of period |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 300 | $ 4,300

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. This item represents short-term investments as of the balance sheet date which may include certificates of deposits and available-for-sale securities. + References No definition available. + Details
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- Definition Fair value portion 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. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + 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 -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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- Definition Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + 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 (c) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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