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Derivative Financial Instruments Derivative Instruments and Hedging Activities - FV of Derivative Instruments Included Within Consolidated Balance Sheet (Details) - Foreign Exchange Forward [Member] - Designated as Hedging Instrument [Member] - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Prepaid Expenses and Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset | $ 1,299 | $ 0
Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset | 500 | 0
Accrued Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability | 0 | 187
Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability | 0 | 402
Derivative Financial Instruments, Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset | $ 1,799 |
Derivative Financial Instruments, Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability |  | $ 589

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