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Financial instruments - Fair value of derivatives (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Foreign Currency Exchange Contracts | Other current liabilities |  |
Derivatives Fair Value [Line Items] |  |
Liability derivatives: | $ 7,793 | $ 0
Cash Flow Hedging |  |
Derivatives Fair Value [Line Items] |  |
Asset derivatives: | 16,050 | 1,221
Liability derivatives: | 8,581 | 1,426
Cash Flow Hedging | Foreign Currency Exchange Contracts | Prepaid expenses and other current assets |  |
Derivatives Fair Value [Line Items] |  |
Asset derivatives: | 16,050 | 1,221
Cash Flow Hedging | Foreign Currency Exchange Contracts | Other current liabilities |  |
Derivatives Fair Value [Line Items] |  |
Liability derivatives: | 788 | 1,426
Cash Flow Hedging | Foreign Currency Exchange Contracts | Designated as Hedging Instrument | Prepaid expenses and other current assets |  |
Derivatives Fair Value [Line Items] |  |
Asset derivatives: | 1,216 | 914
Cash Flow Hedging | Foreign Currency Exchange Contracts | Designated as Hedging Instrument | Other current liabilities |  |
Derivatives Fair Value [Line Items] |  |
Liability derivatives: | 524 | 1,373
Cash Flow Hedging | Foreign Currency Exchange Contracts | Not Designated as Hedging Instrument | Prepaid expenses and other current assets |  |
Derivatives Fair Value [Line Items] |  |
Asset derivatives: | 106 | 307
Cash Flow Hedging | Foreign Currency Exchange Contracts | Not Designated as Hedging Instrument | Other current liabilities |  |
Derivatives Fair Value [Line Items] |  |
Liability derivatives: | 264 | 53
Cash Flow Hedging | Cross Currency Interest Rate Contract | Prepaid expenses and other current assets |  |
Derivatives Fair Value [Line Items] |  |
Asset derivatives: | 14,728 | 0
Cash Flow Hedging | Cross Currency Interest Rate Contract | Other current liabilities |  |
Derivatives Fair Value [Line Items] |  |
Liability derivatives: | $ 7,793 | $ 0

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