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Venezuelan operations - Affect of Foreign Currency Translation (Details) - Venezuela - USD ($)
$ in Thousands
 12 Months Ended
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