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Financial Instruments And Risk Management (Balance Sheet Classification And Fair Value Of Derivative Instruments) (Details) - Currency Forward Contracts [Member] - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017
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Prepaid Expenses And Other Current Assets [Member] | Derivative Instruments Designated As Cash Flow Hedges [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair value of derivative assets | $ 7,262 | $ 1,648 | $ 1,930
Prepaid Expenses And Other Current Assets [Member] | Derivative Instruments Not Designated As Cash Flow Hedges [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair value of derivative assets | 865 | 683 | 959
Other Non-Current Assets [Member] | Derivative Instruments Designated As Cash Flow Hedges [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair value of derivative assets | 7,963 | 335 | 509
Accrued Liabilities [Member] | Derivative Instruments Designated As Cash Flow Hedges [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair value of derivative liabilities | 584 | 9,336 | 10,152
Accrued Liabilities [Member] | Derivative Instruments Not Designated As Cash Flow Hedges [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair value of derivative liabilities | 154 | 1,229 | 407
Other Long Term Liabilities [Member] | Derivative Instruments Designated As Cash Flow Hedges [Member] |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Fair value of derivative liabilities | $ 0 | $ 3,820 | $ 3,048

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