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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
	Mar. 31, 2015	Mar. 31, 2014
Revenue, Major Customer [Line Items]
Revenue	$ 363,109us-gaap_Revenues	$ 235,716us-gaap_Revenues
Americas [Member]
Revenue, Major Customer [Line Items]
Revenue	180,093us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember	125,166us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AmericasMember
Europe, Middle East and Africa [Member]
Revenue, Major Customer [Line Items]
Revenue	139,079us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember	84,174us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_EMEAMember
Asia and Pacific Area Countries [Member]
Revenue, Major Customer [Line Items]
Revenue	$ 43,937us-gaap_Revenues / us-gaap_StatementGeographicalAxis = us-gaap_AsiaPacificMember	$ 26,376us-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

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