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Transactions in soles (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets        
Cash and cash equivalents. $ 210,046 $ 369,200 $ 214,551 $ 80,544
Trade and other receivables 287,712 211,715    
Income tax credit 31,919 24,396    
Total assets 4,107,274 4,217,221 4,332,813  
Liabilities        
Trade and other payables (166,860) (188,723)    
Income tax payable (5,650) (1,760)    
Provisions and contingent liability (72,771) (68,172)    
Total liabilities (1,139,074) (1,187,656) $ (1,269,186)  
PEN        
Assets        
Cash and cash equivalents. 6,796 11,526    
Trade and other receivables 139,624 88,513    
Income tax credit 31,960 24,277    
Total assets 178,380 124,316    
Liabilities        
Trade and other payables (60,311) (53,962)    
Income tax payable (5,692) (2,080)    
Provisions and contingent liability (41,515) (31,282)    
Total liabilities (107,518) (87,324)    
Net asset position $ 70,862 $ 36,992