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Related party disclosures (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Related party disclosures [Line Items]    
Current receivables due from related parties $ 62,601 $ 61,227
Wesment farmers limited [member]    
Related party disclosures [Line Items]    
Contribution towards projects in joint operations 15,000  
Sichuan SQM Migao Chemical Fertilizers Co Ltda. [Member]    
Related party disclosures [Line Items]    
Current receivables due from related parties $ 6,502 $ 10,965