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Financial instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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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).

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