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Derivatives - Foreign Currency Exchange Contracts (Details) - Not Designated as Hedging Instrument | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 USD ($) ¥ / $ $ / R$ $ / € | Dec. 31, 2017 USD ($) ¥ / $ $ / R$ $ / €
USD/Euro Foreign Exchange Forward, July 27, 2018 | USD |  |
Derivative [Line Items] |  |
Notional value | $ 15,000,000 |
Forward rate | $ / € | 1.1575 |
Unrealized gain/(loss) recorded at balance sheet date | $ (148,000) |
USD/Chinese Yuan Renminbi Foreign Exchange Forward, July 27, 2018 | Chinese Yuan Renminbi |  |
Derivative [Line Items] |  |
Notional value | $ 5,000,000 |
Forward rate | ¥ / $ | 6.6195 |
Unrealized gain/(loss) recorded at balance sheet date | $ (15,000) |
USD/Brazilian Real Foreign Exchange Forward, July 24, 2018 | USD |  |
Derivative [Line Items] |  |
Notional value | $ 1,000,000 |
Forward rate | $ / R$ | 3.8626 |
Unrealized gain/(loss) recorded at balance sheet date | $ 6,000 |
USD/Euro Foreign Exchange Forward, January 5, 2018 | USD |  |
Derivative [Line Items] |  |
Notional value |  | $ 17,000,000
Forward rate | $ / € |  | 1.1858
Unrealized gain/(loss) recorded at balance sheet date |  | $ (220,000)
USD/Chinese Yuan Renminbi Foreign Exchange Forward, January 5, 2018 | Chinese Yuan Renminbi |  |
Derivative [Line Items] |  |
Notional value |  | $ 20,000,000
Forward rate | ¥ / $ |  | 6.6481
Unrealized gain/(loss) recorded at balance sheet date |  | $ (410,000)
USD/Brazilian Real Foreign Exchange Forward, January 24, 2018 | USD |  |
Derivative [Line Items] |  |
Notional value |  | $ 2,500,000.0
Forward rate | $ / R$ |  | 3.2350
Unrealized gain/(loss) recorded at balance sheet date |  | $ 65,000

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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 Contractual rate at which a foreign currency can be purchased or sold. + References No definition available. + 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 + Details
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