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Derivatives - Contracts Held (Details) - Not designated as hedging instrument | 9 Months Ended | 12 Months Ended
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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)

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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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