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Concentrations of risk and segment information - Schedule of Revenue by Geographic Segment (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Revenue, Major Customer [Line Items] |  |
Revenue | $ 363,109 us-gaap_Revenues | $ 235,716 us-gaap_Revenues
Americas [Member] |  |
Revenue, Major Customer [Line Items] |  |
Revenue | 180,093 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember | 125,166 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember
Europe, Middle East and Africa [Member] |  |
Revenue, Major Customer [Line Items] |  |
Revenue | 139,079 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember | 84,174 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember
Asia and Pacific Area Countries [Member] |  |
Revenue, Major Customer [Line Items] |  |
Revenue | $ 43,937 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember | $ 26,376 us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember

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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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