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Financial instruments (Details 1) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financial instruments [Line Items] |  |
Other current financial assets | $ 312,721 | $ 366,979
Banco Santander [Member] |  |
Financial instruments [Line Items] |  |
Other current financial assets | 23,124 | 163,269
Banco de Credito e Inversiones [Member] |  |
Financial instruments [Line Items] |  |
Other current financial assets | 145,834 | 71,748
Banco Itau - Corpbanca [Member] |  |
Financial instruments [Line Items] |  |
Other current financial assets | 70,719 | 77,527
Banco Security [Member] |  |
Financial instruments [Line Items] |  |
Other current financial assets | 27,215 | 28,592
Scotiabank Sud Americano [Member] |  |
Financial instruments [Line Items] |  |
Other current financial assets | 24,898 | 13,764
Banco Chile [Member] |  |
Financial instruments [Line Items] |  |
Other current financial assets | 0 | 4,834
Banco BBVA Chile [Member] |  |
Financial instruments [Line Items] |  |
Other current financial assets | $ 0 | $ 1,207

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