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Financial instruments - Fair values of derivative instruments designated as hedging instruments (Details) - USD ($) $ in Thousands | Jul. 02, 2017 | Dec. 31, 2016
--- | --- | ---
Derivatives Fair Value [Line Items] |  |
Total asset derivatives | $ 2,880 | $ 1,157
Total liability derivatives | 489 | 2,257
Foreign exchange contract | Prepaid expenses and other current assets |  |
Derivatives Fair Value [Line Items] |  |
Total asset derivatives | 2,880 | 1,157
Foreign exchange contract | Other current liabilities |  |
Derivatives Fair Value [Line Items] |  |
Total liability derivatives | 489 | 2,257
Foreign exchange contract | Designated as Hedging Instrument | Cash flow hedging | Prepaid expenses and other current assets |  |
Derivatives Fair Value [Line Items] |  |
Total asset derivatives | 2,590 | 667
Foreign exchange contract | Designated as Hedging Instrument | Cash flow hedging | Other current liabilities |  |
Derivatives Fair Value [Line Items] |  |
Total liability derivatives | 323 | 2,139
Foreign exchange contract | Not Designated as Hedging Instrument | Prepaid expenses and other current assets |  |
Derivatives Fair Value [Line Items] |  |
Total asset derivatives | 290 | 490
Foreign exchange contract | Not Designated as Hedging Instrument | Other current liabilities |  |
Derivatives Fair Value [Line Items] |  |
Total liability derivatives | $ 166 | $ 118

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=64830801&loc=SL51823488-111719 + Details
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