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Derivatives - Foreign Currency Exchange Contracts (Details) - Not Designated as Hedging Instrument	9 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($) ¥ / $ $ / R$ $ / €	Dec. 31, 2017 USD ($) ¥ / $ $ / R$ $ / €
USD/Euro
Derivative [Line Items]
Notional value	$ 18,000,000	$ 17,000,000
Forward rate | $ / €	1.1773	1.1858
Unrealized gain/(loss) recorded at balance sheet date	$ 216,000	$ (220,000)
USD
Derivative [Line Items]
Notional value	$ 35,000,000	$ 20,000,000
Forward rate | ¥ / $	6.8963	6.6481
Unrealized gain/(loss) recorded at balance sheet date	$ (56,000)	$ (410,000)
USD/Brazilian Real
Derivative [Line Items]
Notional value	$ 1,000,000	$ 2,500,000.0
Forward rate | $ / R$	4.1032	3.2350
Unrealized gain/(loss) recorded at balance sheet date	$ (13,000)	$ 65,000

X

- 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

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X

- Definition

Contractual rate at which a foreign currency can be purchased or sold.

+ References

No definition available.

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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

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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

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