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Concentrations of risk and segment information - Schedule of Revenue by Geographic Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Revenue, Major Customer [Line Items] |  |  |  |
Revenue | $ 400,340 | $ 279,971 | $ 1,183,368 | $ 760,292
Americas [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenue | 190,839 | 204,893 | 583,282 | 482,769
Europe, Middle East and Africa [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenue | 156,639 | 56,068 | 432,904 | 207,285
Asia and Pacific Area Countries [Member] |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |
Revenue | $ 52,862 | $ 19,010 | $ 167,182 | $ 70,238

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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