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Venezuelan operations (Affect of Foreign Currency Translation) (Details) - Venezuela - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other Operating Income (Expense), Net      
Foreign Operations Disclosure [Line Items]      
Write down of inventories $ (4,468) $ (61,007) $ (4,079)
Impairment of long-lived assets (2,123) (12,089) (8,563)
Foreign Currency Exchange Results      
Foreign Operations Disclosure [Line Items]      
Foreign currency exchange (loss) income $ (583) $ 5,061 $ (4,269)