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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