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Short-term debt (Schedule of Short-term Debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Short-term Debt [Line Items]    
Short-term debt $ 13,296 $ 356
Short-term bank loans    
Short-term Debt [Line Items]    
Short-term debt 10,794 0
Revolving Credit Facility    
Short-term Debt [Line Items]    
Short-term debt 2,500 0
Bank overdrafts    
Short-term Debt [Line Items]    
Short-term debt $ 2 $ 356