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Financial instruments - Additional Information (Details) | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2019 USD ($) | Apr. 01, 2018 USD ($) | Mar. 31, 2019 EUR (€) | Mar. 04, 2019 | Dec. 31, 2018 USD ($) | Oct. 04, 2018 USD ($) | Oct. 04, 2018 EUR (€)
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |
Foreign currency translation, continuing operations, adjustments, net of tax | $ (236,000) | $ 81,188,000 |  |  |  |  |
Net revenues | 613,584,000 | 587,230,000 |  |  |  |  |
Cash flow hedging |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |
Ineffectiveness related to derivatives | 0 | 0 |  |  |  |  |
Foreign exchange contract | Designated as Hedging Instrument | Cash flow hedging |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |
Total notional amount for all open foreign currency forward contracts | 63,400,000 |  |  |  | $ 115,300,000 |  |
Foreign exchange contract | Not Designated as Hedging Instrument |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |
Loss related to currency forward contracts | 3,000,000 | $ 600,000 |  |  |  |  |
Total notional amount for all open foreign currency forward contracts | 132,800,000 |  |  |  | $ 125,900,000 |  |
Cross-currency interest rate swap | Cash flow hedging |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |
Foreign currency translation, continuing operations, adjustments, net of tax | 10,600,000 |  |  |  |  |  |
Cross-currency interest rate swap | Designated as Hedging Instrument |  |  |  |  |  |  |
Derivatives Fair Value [Line Items] |  |  |  |  |  |  |
Total notional amount for all open foreign currency forward contracts | $ 250,000,000 |  | € 219,200,000.0 |  |  | $ 500,000,000 | € 433,900,000.0
Derivative, number of instruments held |  |  |  | 5 |  | 6 | 6
Derivative, fixed interest rate | 4.875% |  | 4.875% |  |  | 4.625% | 4.625%
Derivative, annual interest rate | 2.4595% |  | 2.4595% |  |  | 1.942% | 1.942%

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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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