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Financial risk management (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financial risk management [Line Items]
Financial assets	$ 485,689	$ 1,397,602
Financial Assets Neither Past Due Nor Impaired Total [Member]
Financial risk management [Line Items]
Financial assets	476,332	453,583
Moody´s P-1 SPA-1 [Member] | Banco Credito e Inversiones [Member] | Financial assets neither past due nor impaired [member]
Financial risk management [Line Items]
Financial assets	178,448
Moody´s P-1 SPA-1 [Member] | Banco Santander - Santiago [Member] | Financial assets neither past due nor impaired [member]
Financial risk management [Line Items]
Financial assets	74,365
Moody´s P-1 SPA-1 [Member] | Time deposits [Member] | Banco Credito e Inversiones [Member] | Financial assets neither past due nor impaired [member]
Financial risk management [Line Items]
Financial assets	42,096	27,428
Moody´s P-1 SPA-1 [Member] | Time deposits [Member] | Banco de Chile [Member] | Financial assets neither past due nor impaired [member]
Financial risk management [Line Items]
Financial assets	50,221	7,305
Moody´s P-1 SPA-1 [Member] | Time deposits [Member] | Itau-Corpbanca [Member] | Financial assets neither past due nor impaired [member]
Financial risk management [Line Items]
Financial assets	39,093	61,946
No Rating [Member] | Banco Security [Member] | Financial assets neither past due nor impaired [member]
Financial risk management [Line Items]
Financial assets	17,965
No Rating [Member] | Time deposits [Member] | Banco Santander - Santiago [Member] | Financial assets neither past due nor impaired [member]
Financial risk management [Line Items]
Financial assets	2,708	432
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	53	84
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		86,222
No Rating [Member] | Time deposits [Member] | Banco Estado [Member] | Financial assets neither past due nor impaired [member]
Financial risk management [Line Items]
Financial assets	500	3,602
No Rating [Member] | Time deposits [Member] | Banco Santander [Member] | Financial assets neither past due nor impaired [member]
Financial risk management [Line Items]
Financial assets		432
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	181,155	133,809
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	146,078	132,108
No Rating [Member] | 90 days to 1 year [Member] | Banco de Chile [Member]
Financial risk management [Line Items]
Financial assets	18,026
No Rating [Member] | 90 days to 1 year [Member] | Banco Security [Member] | Financial assets neither past due nor impaired [member]
Financial risk management [Line Items]
Financial assets		27,215
No Rating [Member] | 90 days to 1 year [Member] | Banco Scotiabank [Member] | Financial assets neither past due nor impaired [member]
Financial risk management [Line Items]
Financial assets		24,898
Moody´s P-2 SPA-2 [Member] | Itau-Corpbanca [Member] | Financial assets neither past due nor impaired [member]
Financial risk management [Line Items]
Financial assets	127,579
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		647
Fitch F1 [Member] | Time deposits [Member] | Scotiabank Sud Americano [Member] | Financial assets neither past due nor impaired [member]
Financial risk management [Line Items]
Financial assets	14,428
Moody's P-2 [Member] | 90 days to 1 year [Member] | Banco Scotiabank Sud Americano [Member]
Financial risk management [Line Items]
Financial assets	54,180
Moody's P-1 S&P A-1 [Member] | Time deposits [Member] | Banco Credito e Inversiones [Member] | Financial assets neither past due nor impaired [member]
Financial risk management [Line Items]
Financial assets		27,428
Moody's P-1 S&P A-1 [Member] | Time deposits [Member] | Banco de Chile [Member] | Financial assets neither past due nor impaired [member]
Financial risk management [Line Items]
Financial assets		7,305
Moody's P-1 S&P A-1 [Member] | 90 days to 1 year [Member] | Banco Estado [Member]
Financial risk management [Line Items]
Financial assets	15,126
Moody's P-1 S&P A-1 [Member] | 90 days to 1 year [Member] | Banco de Crdito e Inversiones [Member]
Financial risk management [Line Items]
Financial assets	178,448
Moody's P-1 S&P A-1 [Member] | 90 days to 1 year [Member] | Banco de Crdito e Inversiones [Member] | Financial assets neither past due nor impaired [member]
Financial risk management [Line Items]
Financial assets		145,834
Moody's P-1 S&P A-1 [Member] | 90 days to 1 year [Member] | Banco Santander [Member]
Financial risk management [Line Items]
Financial assets	74,365
Moody's P-1 S&P A-1 [Member] | 90 days to 1 year [Member] | Banco Santander [Member] | Financial assets neither past due nor impaired [member]
Financial risk management [Line Items]
Financial assets		23,124
Moody's P-2 S&P A-2 [Member] | Time deposits [Member] | Banco Itau Corpbanca [Member] | Financial assets neither past due nor impaired [member]
Financial risk management [Line Items]
Financial assets		61,946
Moody's P-2 S&P A-2 [Member] | 90 days to 1 year [Member] | Banco Itau Corpbanca [Member]
Financial risk management [Line Items]
Financial assets	127,579
Moody's P-2 S&P A-2 [Member] | 90 days to 1 year [Member] | Banco Itau Corpbanca [Member] | Financial assets neither past due nor impaired [member]
Financial risk management [Line Items]
Financial assets		70,719
S&P A-2 Fitch F2 [Member] | 90 days to 1 year [Member] | Banco Security [Member]
Financial risk management [Line Items]
Financial assets	$ 17,965
Moody's P3 S&P B [Member] | Time deposits [Member] | Nedbank [Member] | Financial assets neither past due nor impaired [member]
Financial risk management [Line Items]
Financial assets		647
Moodys Aaamf SP AAAm Fitch AAAmmf [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		133,809
SP AAAm Fitch AAAmmf [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		$ 132,108

X

- Definition

The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

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