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Derivative Financial Instruments, Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Oct. 01, 2017 | Sep. 30, 2018 | Oct. 01, 2017 | Dec. 31, 2017
Not Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] | Other Income (Expense) [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative Instruments, Gain (Loss) Recognized in Income, Net | $ 5,030 | $ (2,976) | $ 8,781 | $ (2,251) |
Not Designated as Hedging Instrument [Member] | Intercompany Loans [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount of derivative | 311,331 | 339,227 | 311,331 | 339,227 | $ 418,471
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Ineffective portion, amount of gains (losses) reclassified from other comprehensive earnings into earnings | (1,532) | (9) | (4,368) | (6,495) |
Notional amount of derivative | $ 992,616 | $ 1,740,620 | $ 992,616 | $ 1,740,620 | $ 1,376,877

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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 gain (loss) from the ineffectiveness of the hedge. + 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)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + 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 + Details
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