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Financial risk management (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Financial risk management [Line Items]    
Financial assets $ 291,790 $ 163,269
Financial Assets Neither Past Due Nor Impaired Total [Member]    
Financial risk management [Line Items]    
Financial assets 367,361 578,711
Moody´s P-1 SPA-2 [Member] | Itau-Corpbanca [Member] | Financial assets neither past due nor impaired [member]    
Financial risk management [Line Items]    
Financial assets   77,526
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 145,834  
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 23,124  
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 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 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 61,946  
Moodys P1 SPA1 FitchF1 [Member] | Banco Credito e Inversiones [Member] | Financial assets neither past due nor impaired [member]    
Financial risk management [Line Items]    
Financial assets   71,748
Moodys P1 SPA1 FitchF1 [Member] | Banco Santander - Santiago [Member] | Financial assets neither past due nor impaired [member]    
Financial risk management [Line Items]    
Financial assets   163,269
Moodys P1 SPA1 FitchF1 [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
Moodys P1 SPA1 FitchF1 [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 de Chile [Member] | Financial assets neither past due nor impaired [member]    
Financial risk management [Line Items]    
Financial assets   4,834
No Rating [Member] | Banco Security [Member] | Financial assets neither past due nor impaired [member]    
Financial risk management [Line Items]    
Financial assets 27,215 28,592
No Rating [Member] | Banco Sud Americano [Member] | Financial assets neither past due nor impaired [member]    
Financial risk management [Line Items]    
Financial assets 24,898  
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 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 84 163
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] | Time deposits [Member] | Banco Estado [Member] | Financial assets neither past due nor impaired [member]    
Financial risk management [Line Items]    
Financial assets 3,602  
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 133,809 143,333
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 132,108  
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 70,719  
Moody´s P-2 SPA-2 [Member] | Banco Security [Member] | Financial assets neither past due nor impaired [member]    
Financial risk management [Line Items]    
Financial assets   4,191
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 $ 647 3,686
FitchAA [Member]    
Financial risk management [Line Items]    
Financial assets   $ 13,765