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Venezuelan operations - Affect of Foreign Currency Translation (Details) - Venezuela - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other Operating Income (Expense), Net |  |  |
Foreign Operations Disclosure [Line Items] |  |  |
Write down of inventories | $ (1,625) | $ (4,468) | $ (61,007)
Impairment of long-lived assets | (904) | (2,123) | (12,089)
Foreign Currency Exchange Results |  |  |
Foreign Operations Disclosure [Line Items] |  |  |
Foreign currency exchange (loss) income | $ 27 | $ (583) | $ 5,061

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