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Other expense (income) (Summary of other expense (income)) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
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Jun. 28, 2014 | Jun. 29, 2013 | Jun. 28, 2014 | Jun. 29, 2013
Component Of Other Expense (Income) Nonoperating [Line Items] |  |  |  |
Total other expense (income) | $ (1,555) | $ (1,097) | $ 3,335 | $ 5,290
Foreign Currency (Gains) Losses, Net [Member] |  |  |  |
Component Of Other Expense (Income) Nonoperating [Line Items] |  |  |  |
Total other expense (income) | (1,033) | (767) | 4,855 | 3,032
All Other, Net [Member] |  |  |  |
Component Of Other Expense (Income) Nonoperating [Line Items] |  |  |  |
Total other expense (income) | $ (522) | $ (330) | $ (1,520) | $ 2,258

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- Definition The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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