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Commitments and contingencies (Details)
€ in Thousands, $ in Thousands
9 Months Ended
Aug. 11, 2020
USD ($)
Sep. 30, 2020
EUR (€)
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2019
EUR (€)
Sep. 30, 2019
EUR (€)
Tax contingencies            
Tax provisions   € 30,630     € 27,040  
Uncertain tax positions for which no provision has been made   8,925        
Expected reimbursement, other provisions | $ $ 1,000          
Legal proceedings provision [member]            
Tax contingencies            
Litigation Settlement, Gross $ 5,000 4,265 $ 5,000      
Expected reimbursement, other provisions | $       $ 1,000    
Tax provisions            
Tax contingencies            
Tax provisions   € 28,583       € 25,840