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Financial risk management (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financial risk management [Line Items] |  |
Financial assets | $ 360,941 | $ 1,270,817
Time and Investment Fund Deposits Total [Member] |  |
Financial risk management [Line Items] |  |
Financial assets | 578,711 |
Moody´s P-1 SPA1 FitchN1 [Member] | Time deposits [Member] | Banco Credito e Inversiones [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 120,616 |
Moody´s P-1 SPA1 FitchN1 [Member] | Time deposits [Member] | Banco Santander - Santiago [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 35,558 |
No Rating [Member] | Banco BBVA Chile [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 1,207 |
No Rating [Member] | Banco Credito e Inversiones [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 71,748 |
No Rating [Member] | Banco Santander - Santiago [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 163,269 |
No Rating [Member] | Banco de Chile [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 4,834 |
No Rating [Member] | Itau-Corpbanca [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 77,527 |
No Rating [Member] | Scotiabank Sud Americano [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 13,764 |
No Rating [Member] | Banco Security [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 28,592 |
No Rating [Member] | Time deposits [Member] | BBVA Banco Frances [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 163 |
No Rating [Member] | Time deposits [Member] | Scotiabank Sud Americano [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 12,520 |
No Rating [Member] | Time deposits [Member] | ABN Armo Bank [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 1,439 |
No Rating [Member] | Investment Fund Deposits [Member] | JP Morgan US dollar Liquidity Fund Institutional [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 143,333 |
No Rating [Member] | Investment Fund Deposits [Member] | Legg Mason - Western Asset Institutional Cash Reserves [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 144,464 |
Moody´s P-2 SPA-2 [Member] | Time deposits [Member] | Banco BBVA Chile [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 41,860 |
Moody´s P-2 SPA-2 [Member] | Time deposits [Member] | Itau-Corpbanca [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | 75,072 |
Moody´s P-1 SPB [Member] | Time deposits [Member] | Nedbank [Member] | Financial assets neither past due nor impaired [member] |  |
Financial risk management [Line Items] |  |
Financial assets | $ 3,686 |

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