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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, 2018 | Dec. 31, 2017
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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 | $ 1,797 | $ 683
Not Designated as Hedging Instrument [Member] | Accrued Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative liabilities | 970 | 1,229
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 | 11,818 | 1,648
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative assets | 9,922 | 335
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Accrued Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative liabilities | 47 | 9,336
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Other Long Term Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative liabilities | $ 1 | $ 3,820

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