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Financial instruments (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Financial instruments [Line Items]    
Assets before allowances $ 396,099 $ 422,236
Allowance for doubtful trade receivables (19,728) (21,384)
Assets for trade receivables, net 376,371 400,852
Receivables related to credit operations, current [Member]    
Financial instruments [Line Items]    
Assets before allowances 327,586 383,775
Allowance for doubtful trade receivables (14,321) (16,192)
Assets for trade receivables, net 313,265 367,583
Trade receivables, current [Member]    
Financial instruments [Line Items]    
Assets before allowances 327,586 383,775
Allowance for doubtful trade receivables (14,321) (16,192)
Assets for trade receivables, net 313,265 367,583
Prepayments, current [Member]    
Financial instruments [Line Items]    
Assets before allowances 20,684 21,092
Allowance for doubtful trade receivables (784) (783)
Assets for trade receivables, net 19,900 20,309
Other receivables, current [Member]    
Financial instruments [Line Items]    
Assets before allowances 36,664 15,659
Allowance for doubtful trade receivables (4,623) (4,409)
Assets for trade receivables, net 32,041 11,250
Current trade and other receivables [Member]    
Financial instruments [Line Items]    
Assets before allowances 57,348 36,751
Allowance for doubtful trade receivables (5,407) (5,192)
Assets for trade receivables, net 51,941 31,559
Other receivables, non-current [Member]    
Financial instruments [Line Items]    
Assets before allowances 11,165 1,710
Allowance for doubtful trade receivables 0 0
Assets for trade receivables, net 11,165 1,710
Non-current receivables [Member]    
Financial instruments [Line Items]    
Assets before allowances 11,165 1,710
Allowance for doubtful trade receivables 0 0
Assets for trade receivables, net $ 11,165 $ 1,710