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Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Fair value of assets and liabilities measured on recurring basis |  |
Short-term investments | $ 363,817 | $ 305,324
Fair value measurements recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair value of assets and liabilities measured on recurring basis |  |
Short-term investments | 363,817 | 305,324
Total | 363,817 | 305,324
Fair value measurements recurring basis | Significant Observable Inputs (Level 2) |  |
Fair value of assets and liabilities measured on recurring basis |  |
Forward contracts | (3,128) | (2,169)
Total | (3,128) | (2,169)
Fair value measurements recurring basis | Total |  |
Fair value of assets and liabilities measured on recurring basis |  |
Short-term investments | 363,817 | 305,324
Forward contracts | (3,128) | (2,169)
Total | $ 360,689 | $ 303,155

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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into. + References No definition available. + Details
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- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 + Details
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