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Financial instruments (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Financial instruments [Line Items]    
Other current financial assets $ 505,490 $ 312,721
Financial assets at amortised cost [member]    
Financial instruments [Line Items]    
Other current financial assets 485,689 291,790
Financial assets at amortised cost [member] | Banco de Credito e Inversiones [Member]    
Financial instruments [Line Items]    
Other current financial assets 185,400 145,834
Financial assets at amortised cost [member] | Banco Santander [Member]    
Financial instruments [Line Items]    
Other current financial assets 74,365 23,124
Financial assets at amortised cost [member] | Banco Itau - Corpbanca [Member]    
Financial instruments [Line Items]    
Other current financial assets 120,628 70,719
Financial assets at amortised cost [member] | Banco Security [Member]    
Financial instruments [Line Items]    
Other current financial assets 17,964 27,215
Financial assets at amortised cost [member] | Banco de Chile [Member]    
Financial instruments [Line Items]    
Other current financial assets 18,026  
Financial assets at amortised cost [member] | Banco Estado [Member]    
Financial instruments [Line Items]    
Other current financial assets 15,126  
Financial assets at amortised cost [member] | Scotiabank Sud Americano [Member]    
Financial instruments [Line Items]    
Other current financial assets $ 54,180 $ 24,898