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Derivative Instruments - Fair Value Amounts (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Other current assets | Foreign currency exchange contracts |  |
Derivative [Line Items] |  |
Fair Value Assets | $ 0 | $ 5,779

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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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Balance Type: | debit
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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Period Type: | duration

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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
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