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Financial Instruments and Risk Management (Balance Sheet Classification and Fair Value of Derivative Instruments) (Details) - Forward Contracts [Member] - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Not Designated as Hedging Instrument [Member] | Prepaid Expenses And Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative assets | $ 683 | $ 1,361
Not Designated as Hedging Instrument [Member] | Accrued Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative liabilities | 1,229 | 180
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Prepaid Expenses And Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative assets | 1,648 | 9,805
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative assets | 335 | 1,969
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Accrued Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative liabilities | 9,336 | 106
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Other Long Term Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative liabilities | $ 3,820 | $ 0

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- Definition Aggregate fair value of all derivative assets designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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- Definition Aggregate fair value of all derivative liabilities designated as hedging instruments. Includes instruments designated as cash flow hedges, fair value hedges, and hedges of net investments in foreign operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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