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Derivatives - Contracts Held (Details) - Not designated as hedging instrument	9 Months Ended	12 Months Ended
	Sep. 30, 2017 USD ($) $ / ¥ $ / € BRL / $ $ / BRL	Dec. 31, 2016 USD ($) ¥ / $ $ / € $ / BRL
Foreign currency exchange contracts | USD/Euro
Derivative [Line Items]
Notional value	$ 17,000,000	$ 18,000,000
Forward rate | $ / €	1.20390	1.0513
Unrealized gain/(loss) recorded at balance sheet date	$ 299,000	$ (61,000)
Foreign currency exchange contracts | USD/Chinese Yuan Renminbi
Derivative [Line Items]
Notional value	$ 22,000,000
Forward rate | $ / ¥	6.61740
Unrealized gain/(loss) recorded at balance sheet date	$ 111,000
Foreign currency exchange contract, One | USD/Brazilian Real
Derivative [Line Items]
Notional value	$ 4,500,000.0	$ 2,000,000
Forward rate | $ / BRL	3.23300	3.4775
Unrealized gain/(loss) recorded at balance sheet date	$ (86,000)	$ (131,000)
Foreign currency exchange contract, Two | USD/Brazilian Real
Derivative [Line Items]
Notional value	$ 1,000,000	$ 4,000,000
Forward rate	3.3660	3.2316
Unrealized gain/(loss) recorded at balance sheet date	$ 61,000	$ 39,000
Foreign currency exchange contract, Three | USD/Chinese Yuan Renminbi
Derivative [Line Items]
Notional value		$ 10,000,000
Forward rate | ¥ / $		6.6757
Unrealized gain/(loss) recorded at balance sheet date		$ (457,000)
Foreign currency exchange contract, Four | USD/Chinese Yuan Renminbi
Derivative [Line Items]
Notional value		$ 25,000,000
Forward rate | ¥ / $		6.7230
Unrealized gain/(loss) recorded at balance sheet date		$ (974,000)

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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- Definition

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

+ References

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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

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