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Financial instruments - Fair values of derivative instruments designated as hedging instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Cash flow hedging |  |
Derivatives Fair Value [Line Items] |  |
Total asset derivatives | $ 24,287 | $ 16,050
Total liability derivatives | 5,300 | 8,581
Foreign exchange contract | Other liabilities |  |
Derivatives Fair Value [Line Items] |  |
Total liability derivatives | 3,713 | 7,793
Foreign exchange contract | Cash flow hedging | Prepaid expenses and other current assets |  |
Derivatives Fair Value [Line Items] |  |
Total asset derivatives | 24,276 | 16,050
Foreign exchange contract | Cash flow hedging | Other assets |  |
Derivatives Fair Value [Line Items] |  |
Total asset derivatives | 11 | 0
Foreign exchange contract | Cash flow hedging | Other current liabilities |  |
Derivatives Fair Value [Line Items] |  |
Total liability derivatives | 1,587 | 788
Foreign exchange contract | Designated as Hedging Instrument | Cash flow hedging | Prepaid expenses and other current assets |  |
Derivatives Fair Value [Line Items] |  |
Total asset derivatives | 883 | 1,216
Foreign exchange contract | Designated as Hedging Instrument | Cash flow hedging | Other current liabilities |  |
Derivatives Fair Value [Line Items] |  |
Total liability derivatives | 1,054 | 524
Foreign exchange contract | Not Designated as Hedging Instrument | Cash flow hedging | Prepaid expenses and other current assets |  |
Derivatives Fair Value [Line Items] |  |
Total asset derivatives | 264 | 106
Foreign exchange contract | Not Designated as Hedging Instrument | Cash flow hedging | Other current liabilities |  |
Derivatives Fair Value [Line Items] |  |
Total liability derivatives | 533 | 264
Cross-currency interest rate swap | Cash flow hedging | Prepaid expenses and other current assets |  |
Derivatives Fair Value [Line Items] |  |
Total asset derivatives | 23,129 | 14,728
Cross-currency interest rate swap | Cash flow hedging | Other assets |  |
Derivatives Fair Value [Line Items] |  |
Total asset derivatives | 11 | 0
Cross-currency interest rate swap | Cash flow hedging | Other liabilities |  |
Derivatives Fair Value [Line Items] |  |
Total liability derivatives | $ 3,713 | $ 7,793

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