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Related party disclosures (Details Textual) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Related party disclosures [Line Items]      
Current receivables due from related parties $ 61,227 $ 61,227 $ 42,790
Sichuan SQM Migao Chemical Fertilizers Co Ltda. [Member]      
Related party disclosures [Line Items]      
Current receivables due from related parties $ 10,965   $ 10,965