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Financial instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Financial instruments [Line Items]    
Other non-current financial assets $ 17,131 $ 42,879
Other current financial assets 312,721 366,979
Hedging assets [Member]    
Financial instruments [Line Items]    
Other non-current financial assets 13,425 8,910
Other current financial assets 18,238 0
Financial assets at amortised cost, category [member]    
Financial instruments [Line Items]    
Other non-current financial assets [1] 75 24,790
Other current financial assets [2] 291,790 360,941
Financial assets at fair value through profit or loss, classified as held for trading, category [member]    
Financial instruments [Line Items]    
Other current financial assets [3] 2,693 6,038
Financial assets available-for-sale, category [member]    
Financial instruments [Line Items]    
Other non-current financial assets 0 9,179
Financial assets measured at fair value through other comprehensive income, category [member]    
Financial instruments [Line Items]    
Other non-current financial assets $ 3,631 $ 0
[1] SQM Potassium S.A., contributed ThUS$24,745 to Western Australia Lithium (WAL). As of December 31, 2017, this had not been legally incorporated as a Company and the funds remained in trust pending transfer to WAL.
[2] Corresponds to term deposits whose maturity date is greater than 90 days and less than 360 days from the investment date constituted in the following financial institutions:
[3] Correspond to forwards and options that were not classified as hedging instruments (See detail in Note 13.3).