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Derivative Financial Instruments and Fair Value Measurements (Foreign Forward Currency Contracts Narrative) (Details) $ in Thousands, € in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 29, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 29, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 29, 2018 EUR (€) | Sep. 29, 2018 USD ($)
Derivative [Line Items] |  |  |  |  |  |
Unrealized loss (gain) on derivative instrument | $ (2,110) | $ (754) | $ (867) | $ 475 |  |
Not Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | 200 | 300 | 1,600 | (2,600) |  |
Not Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring [Member] | EUR |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, Notional Amount |  |  |  |  | € 17.0 | $ 20,500
Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Unrealized loss (gain) on derivative instrument | 0 | 200 | 500 | 2,300 |  |
Designated as Hedging Instrument [Member] | Fair Value, Measurements, Recurring [Member] | Reclassification Out Of Accumulated Other Comprehensive Income Member |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Foreign Currency Cash Flow Hedge Gain Loss Reclassified To Earnings Net | $ 0 | $ 200 | $ 100 | 1,000 |  |
Gain Loss On Components Excluded From Assessment Of Foreign Currency Cash Flow Hedge Effectiveness |  |  |  | $ 900 |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition The amount of net gains or losses on foreign currency cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition The net gain (loss) relating to components of the gain (loss) on foreign currency cash flow hedging instruments excluded from the assessment of hedge effectiveness. Recognized in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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