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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 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Prepaid Expenses and Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset | $ 885 | $ 0
Other Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset | 94 | 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 | $ 979 |
Derivative Financial Instruments, Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability |  | $ 589

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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