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Accumulated other comprehensive income (loss) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Apr. 04, 2015
Accumulated Other Comprehensive Income Rollforward [Roll Forward] |  |
Balance as of December 31, 2014 | $ (429,321)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
Current period other comprehensive income (loss) before reclassifications | (226,073)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax |
Balance as of April 4, 2015 | (655,394)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax |
Foreign currency translation adjustments |  |
Accumulated Other Comprehensive Income Rollforward [Roll Forward] |  |
Balance as of December 31, 2014 | (428,505)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
Current period other comprehensive income (loss) before reclassifications | (226,159)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
Balance as of April 4, 2015 | (654,664)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedTranslationAdjustmentMember |
Pensions |  |
Accumulated Other Comprehensive Income Rollforward [Roll Forward] |  |
Balance as of December 31, 2014 | (816)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | [1]
Current period other comprehensive income (loss) before reclassifications | 86us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | [1]
Balance as of April 4, 2015 | $ (730)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember | [1]
[1] | This accumulated other comprehensive income (loss) component is included in the computation of net periodic pension cost (refer to Note 13 to the consolidated financial statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2014).

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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- Definition Amount after tax, before reclassification adjustments of other comprehensive income (loss). + References No definition available. + Details
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