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Borrowings and debt (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of short term borrowings [Line Items]    
Prepaid commissions $ 7,707 $ 3,362
Euro Medium Term Note Program [Member]    
Disclosure of short term borrowings [Line Items]    
Description Of Borrowings Terms EMTN, which may be used to issue notes for up to $2.250 million, with maturities from 7 days up to a maximum of 30 years, at fixed or floating interest rates, or at discount, and in various currencies.  
Maximum Borrowing Capacity $ 2,250  
Euro Medium Term Note Program [Member] | Minimum    
Disclosure of short term borrowings [Line Items]    
Maturity term 7 days  
Euro Medium Term Note Program [Member] | Maximum    
Disclosure of short term borrowings [Line Items]    
Maturity term 30 years  
Certificados Bursatiles Program [Member]    
Disclosure of short term borrowings [Line Items]    
Description Of Borrowings Terms Short-and Long-Term Notes ("Certificados Bursatiles") Program (the "Mexican Program") in the Mexican local market, registered with the Mexican National Registry of Securities administered by the National Banking and Securities Commission in Mexico ("CNBV", for its acronym in Spanish), for an authorized aggregate principal amount of 10 billion Mexican pesos with maturities from 1 day to 30 years  
Aggregate principal amount $ 10,000,000  
Certificados Bursatiles Program [Member] | Minimum    
Disclosure of short term borrowings [Line Items]    
Maturity term 1 day  
Certificados Bursatiles Program [Member] | Maximum    
Disclosure of short term borrowings [Line Items]    
Maturity term 30 years