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Derivatives - Contracts Held (Details) - Not designated as hedging instrument | 12 Months Ended
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Dec. 31, 2017 USD ($) $ / € ¥ / $ $ / R$ | Dec. 31, 2016 USD ($) $ / € ¥ / $ $ / R$
Euro | Foreign Currency Exchange Contract |  |
Derivative [Line Items] |  |
Notional Value | $ 17,000,000 | $ 18,000,000
Forward Rate | $ / € | 1.1858 | 1.0513
Unrealized Gain/(Loss) Recorded at Balance Sheet Date | $ (220,000) | $ (61,000)
Chinese Yuan Renminbi | Foreign Currency Exchange Contract, One |  |
Derivative [Line Items] |  |
Notional Value | $ 20,000,000 | $ 25,000,000
Forward Rate | ¥ / $ | 6.6481 | 6.7230
Unrealized Gain/(Loss) Recorded at Balance Sheet Date | $ (410,000) | $ (974,000)
Chinese Yuan Renminbi | Foreign Exchange Forward, Contract Three |  |
Derivative [Line Items] |  |
Notional Value |  | $ 10,000,000
Forward Rate | ¥ / $ |  | 6.6757
Unrealized Gain/(Loss) Recorded at Balance Sheet Date |  | $ (457,000)
USD | Foreign Currency Exchange Contract, Two |  |
Derivative [Line Items] |  |
Notional Value | $ 2,500,000.0 | $ 2,000,000
Forward Rate | $ / R$ | 3.2350 | 3.4775
Unrealized Gain/(Loss) Recorded at Balance Sheet Date | $ 65,000 | $ (131,000)
USD | Foreign Exchange Forward, Contract Four |  |
Derivative [Line Items] |  |
Notional Value |  | $ 4,000,000
Forward Rate | $ / R$ |  | 3.2316
Unrealized Gain/(Loss) Recorded at Balance Sheet Date |  | $ 39,000

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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