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Derivatives - Fair Value (Details) - Fair Value Measurement Using - Foreign currency exchange contracts - Not designated as hedging instrument - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Estimate of fair value measurement |  |
Derivatives, Fair Value [Line Items] |  |
Foreign currency exchange contracts | $ (385) | $ (1,584)
Level 1 |  |
Derivatives, Fair Value [Line Items] |  |
Foreign currency exchange contracts | 0 | 0
Level 2 |  |
Derivatives, Fair Value [Line Items] |  |
Foreign currency exchange contracts | (385) | (1,584)
Level 3 |  |
Derivatives, Fair Value [Line Items] |  |
Foreign currency exchange contracts | $ 0 | $ 0

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