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Short-term debt - Schedule of Short-term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Short-term Debt [Line Items]          
Short-term debt $ 0 $ 11,000 $ 158,200 $ 136,000 $ 13,296
Short-term bank loans          
Short-term Debt [Line Items]          
Short-term debt 0       10,794
Revolving Credit Facility          
Short-term Debt [Line Items]          
Short-term debt 0       2,500
Bank overdrafts          
Short-term Debt [Line Items]          
Short-term debt $ 0       $ 2