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Transactions in Soles (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Assets        
Cash and cash equivalents $ 214,551 $ 80,544 $ 78,519 $ 78,512
Trade and other receivables 306,884 269,089    
Income tax credit 23,165 19,956    
Prepaid expenses 17,551 11,392    
Total assets 4,332,813 4,266,415 4,547,181  
Liabilities        
Bank loans 96,215 55,000 285,302 $ 40,000
Trade and other payables (87,839) (130,772)    
Income tax payable 2,081 8,686    
Provisions 76,847 62,502    
Total liability 1,269,186 1,219,202 $ 1,157,945  
Net asset (liability) position $ 38,967 $ 31,056