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Transactions in Soles (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Assets        
Cash and cash equivalents $ 369,200 $ 214,551 $ 80,544 $ 78,519
Trade and other receivables 211,715 314,308    
Income tax credit 24,396 23,165    
Prepaid expenses 17,145 17,551    
Total assets 4,217,221 4,332,813 4,266,415  
Liabilities        
Bank loans (95,000) (96,215) (55,000) $ (285,302)
Trade and other payables (220,042) (100,860)    
Income tax payable (1,760) (2,081)    
Provisions and contingent liability (68,172) (76,847)    
Total liabilities (1,187,656) (1,269,186) $ (1,219,202)  
Net asset position $ 36,992 $ 41,965