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Derivatives - Fair Value (Details) - Fair value measurements, recurring - Foreign Currency Exchange Contract - Not designated as hedging instrument - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Estimate of fair value |  |
Derivatives, Fair Value [Line Items] |  |
Foreign currency exchange contracts | $ (565) | $ (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 | (565) | (1,584)
Level 3 |  |
Derivatives, Fair Value [Line Items] |  |
Foreign currency exchange contracts | $ 0 | $ 0

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