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Derivatives and Hedging Activities Assets Liabilities Balance Sheet Location (Details) - Foreign Exchange Contract [Member] - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Current | $ 118 | $ 54
Derivative Liability, Current | 64 | 40
Not Designated as Hedging Instrument [Member] | Prepaid Expenses and Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Current | 118 | 54
Not Designated as Hedging Instrument [Member] | Accrued Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Current | $ 64 | $ 40

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