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Summary of significant accounting policies (Details 3) | 12 Months Ended
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Dec. 31, 2011 unit
Finite lived intangible assets |
Number of reporting units | 3
Developed technologies |
Finite lived intangible assets |
Weighted average amortization period (in years) | 11
Distribution networks |
Finite lived intangible assets |
Weighted average amortization period (in years) | 10

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- Definition The number of reporting units of the entity, which is consistent with the entity's reporting segments. + References No definition available. + Details
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- Definition The average useful life of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16265-109275 + Details
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