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Financial Instruments and Fair Value Measurements (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Details) - Forward Currency Contracts [Member] - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Not Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional amounts | $ 920 | [1] | $ 1,486
Cash flow hedges , other derivative assets | 4 |  |
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional amounts | 7,112 | [1] | 9,143
Cash flow hedges , other derivative assets | 665 |  | 0
Other Liabilities [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair value of other derivatives | 0 |  | (48)
Other Liabilities [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Cash flow hedges , prepaid expense and other current assets | $ 0 |  | $ (221)
[1] | Notional amounts represent the gross contract of the derivatives outstanding in U.S. dollars.

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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 Fair value of all asset derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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- Definition Net fair value of all derivative instruments designated as cash flow hedging instruments, which is ordinarily reflected within other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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