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Financial instruments - Fair values of derivative instruments designated as hedging instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Cash flow hedging |  |
Derivatives Fair Value [Line Items] |  |
Total asset derivatives | $ 22,659 | $ 16,050
Total liability derivatives | 7,275 | 8,581
Foreign exchange contract | Other liabilities |  |
Derivatives Fair Value [Line Items] |  |
Total liability derivatives | 6,152 | 7,793
Foreign exchange contract | Cash flow hedging | Prepaid expenses and other current assets |  |
Derivatives Fair Value [Line Items] |  |
Total asset derivatives | 22,659 | 16,050
Foreign exchange contract | Cash flow hedging | Other current liabilities |  |
Derivatives Fair Value [Line Items] |  |
Total liability derivatives | 1,123 | 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 | 1,344 | 1,216
Foreign exchange contract | Designated as Hedging Instrument | Cash flow hedging | Other current liabilities |  |
Derivatives Fair Value [Line Items] |  |
Total liability derivatives | 992 | 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 | 159 | 106
Foreign exchange contract | Not Designated as Hedging Instrument | Cash flow hedging | Other current liabilities |  |
Derivatives Fair Value [Line Items] |  |
Total liability derivatives | 131 | 264
Cross-currency interest rate swap | Cash flow hedging | Prepaid expenses and other current assets |  |
Derivatives Fair Value [Line Items] |  |
Total asset derivatives | 21,156 | 14,728
Cross-currency interest rate swap | Cash flow hedging | Other liabilities |  |
Derivatives Fair Value [Line Items] |  |
Total liability derivatives | $ 6,152 | $ 7,793

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