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Derivatives - Narrative (Details) € in Thousands, ₩ in Thousands, ¥ in Thousands, ¥ in Thousands, £ in Thousands, kr in Thousands, kr in Thousands, SFr in Thousands, R$ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands, $ in Thousands | 9 Months Ended |  |  |
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Sep. 30, 2018 USD ($) | Sep. 30, 2018 CNY (¥) derivative_instrument | Sep. 30, 2018 SGD ($) derivative_instrument | Sep. 30, 2018 EUR (€) derivative_instrument | Sep. 30, 2018 SEK (kr) derivative_instrument | Sep. 30, 2018 GBP (£) derivative_instrument | Sep. 30, 2018 KRW (₩) derivative_instrument | Sep. 30, 2018 JPY (¥) derivative_instrument | Sep. 30, 2018 AUD ($) derivative_instrument | Sep. 30, 2018 DKK (kr) derivative_instrument | Sep. 30, 2018 USD ($) derivative_instrument | Sep. 30, 2018 HKD ($) derivative_instrument | Sep. 30, 2018 CAD ($) derivative_instrument | Sep. 30, 2018 MXN ($) derivative_instrument | Sep. 30, 2018 BRL (R$) derivative_instrument | Sep. 30, 2018 CHF (SFr) derivative_instrument | Dec. 31, 2017 USD ($) | Aug. 05, 2016 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred taxes used to offset fair value of interest rate swap |  |  |  |  |  |  |  |  |  |  | $ (2,100) |  |  |  |  |  | $ (1,500) |
Maturity of derivative contract (up to) | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue and cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount expected to be reclassified from accumulated other comprehensive income to earnings in next twelve months, gross | $ 858 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount expected to be reclassified from accumulated other comprehensive income to earnings in next twelve months, net of tax | 637 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount expected to be reclassified from accumulated other comprehensive income to earnings in next twelve months, gross | 2,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount expected to be reclassified from accumulated other comprehensive income to earnings in next twelve months, net of tax | $ 2,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of derivative |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 175,000
Fixed rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.12%
Deferred taxes used to offset fair value of interest rate swap |  |  |  |  |  |  |  |  |  |  | $ (2,100) |  |  |  |  |  |  |
Foreign currency forward contracts | Designated as hedging instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Average number of contracts entered into per month | derivative_instrument |  | 150 | 150 | 150 | 150 | 150 | 150 | 150 | 150 | 150 | 150 | 150 | 150 | 150 | 150 | 150 |  |
Foreign currency forward contracts | Not designated as hedging instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of derivative |  | ¥ 95,228 | $ 6,900 | € 25,861 | kr 10,536 | £ 1,584 | ₩ 2,700,000 | ¥ 260,000 | $ 11,150 | kr 2,885 |  | $ 11,000 | $ 3,098 | $ 18,700 | R$ 8,500 | SFr 255 |  |
Average number of contracts entered into per month | derivative_instrument |  | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 |  |
Other assets (long-term) | Interest rate swap | Designated as hedging instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Asset Derivatives |  |  |  |  |  |  |  |  |  |  | $ 8,284 |  |  |  |  |  | 5,749 |
Other assets (long-term) | Foreign currency forward contracts | Designated as hedging instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Asset Derivatives |  |  |  |  |  |  |  |  |  |  | $ 161 |  |  |  |  |  | $ 35 |

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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 Accumulated Other Comprehensive Income (Loss), Cumulative Changes In Net Gain (Loss) From Cash Flow Hedges, Tax + References No definition available. + Details
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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109247956&loc=SL51823488-111719 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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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 No definition available. + Details
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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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