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Fair Value Measurement (Schedule of Fair Value Measurements) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative asset (liabilities) | $ (450) | $ (568)
Foreign Exchange Future [Member] | Not Designated as Hedging Instrument [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets | 374 | 90
Derivative liabilities | (196) | (921)
Foreign Exchange Future [Member] | Designated as Hedging Instrument [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative assets |  | 263
Derivative liabilities | $ (628) |

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