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Derivative Financial Instruments - Balance Sheet Location and Fair Value of Assets Associated with Derivative Financial Instruments (Details) - Not Designated as Hedging Instrument - Foreign exchange contract - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Other Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Foreign exchange contracts: other current liabilities | $ 1,201 | $ 12
Other Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Foreign exchange contracts: other current assets | $ 36 | $ 488

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- Definition Fair value as of the balance sheet date of all foreign currency derivative assets not designated as hedging instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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