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Derivatives (Details) - Foreign currency forward contracts [Member] - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Prepaid expenses and other current assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives designated as hedging instruments | $ 0 | $ 342
Accrued expenses [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives designated as hedging instruments | $ 147 | $ 0

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- Definition Sum as of the balance sheet date of the (a) fair values of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and (b) the carrying amounts of the liabilities arising from financial instruments or contracts used to mitigate a specified risk (hedge), and which are expected to be extinguished or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Balance Type: | na
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- Details
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Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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