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Trade and other receivables, net (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Trade and other receivables, net [Line Items]      
Trade receivables, gross $ 168,714 $ 236,279  
Trade receivables, net ,Allowance for doubtful accounts (22,013) [1] (22,823) [1] $ (22,644)
Trade receivables, net 146,701 213,456  
Other receivables 105,607 145,043  
Total trade and other receivables, net 252,308 358,499  
Classification by maturity:      
Current portion 211,715 314,308  
Non-current portion 40,593 44,191  
Total trade and other receivables, net 252,308 358,499  
Classification by nature:      
Financial receivables 196,402 265,264  
Non-financial receivables 55,906 93,235  
Total trade and other receivables, net 252,308 358,499  
Classification by measurement :      
Trade receivables (without provisional prices) 144,844 61,188  
Trade receivables (with provisional prices) 107,549 152,268  
Other accounts receivables 105,607 145,043  
Total trade and other receivables, net 252,308 358,499  
Value added tax credit [Member]      
Disclosure of Trade and other receivables, net [Line Items]      
Other receivables 49,332 74,785  
Accounts receivables to third parties [Member]      
Disclosure of Trade and other receivables, net [Line Items]      
Other receivables 24,625 27,859  
Advances to suppliers [Member]      
Disclosure of Trade and other receivables, net [Line Items]      
Other receivables 7,542 1,977  
Refund application of value added tax [Member]      
Disclosure of Trade and other receivables, net [Line Items]      
Other receivables [2] 6,574 18,450  
Tax deposits [Member]      
Disclosure of Trade and other receivables, net [Line Items]      
Other receivables [3] 4,769 9,733  
Related entities [Member]      
Disclosure of Trade and other receivables, net [Line Items]      
Trade receivables, gross [4] 7,177 7,348  
Other receivables [4] 3,705 732  
Interest Receivables [Member]      
Disclosure of Trade and other receivables, net [Line Items]      
Other receivables 3,000 1,719  
Restricted bank accounts [Member]      
Disclosure of Trade and other receivables, net [Line Items]      
Other receivables [5] 2,782 2,372  
Due from sale of assets [Member]      
Disclosure of Trade and other receivables, net [Line Items]      
Other receivables 2,715 5,371  
Tax claims [Member]      
Disclosure of Trade and other receivables, net [Line Items]      
Other receivables 2,573 2,300  
Loan to Personal [Member]      
Disclosure of Trade and other receivables, net [Line Items]      
Other receivables 1,392 1,179  
Insurance claim [Member]      
Disclosure of Trade and other receivables, net [Line Items]      
Other receivables 0 3,716  
Other minors [Member]      
Disclosure of Trade and other receivables, net [Line Items]      
Other receivables 2,738 1,911  
Allowance for expected credit losses [member]      
Disclosure of Trade and other receivables, net [Line Items]      
Other receivables [1] (10,089) (9,361)  
Domestic clients [Member]      
Disclosure of Trade and other receivables, net [Line Items]      
Trade receivables, gross 105,225 109,543  
Foreign clients [Member]      
Disclosure of Trade and other receivables, net [Line Items]      
Trade receivables, gross 56,312 119,388  
Accounts receivable from hedge instruments [Member]      
Disclosure of Trade and other receivables, net [Line Items]      
Other receivables $ 3,949 $ 2,300  
[1] Below is presented the movement in the allowance for expected credit losses:
[2] This item mainly corresponds current year applications that have been refunded during 2018.
[3] Corresponds to deposits held in the Peruvian State bank which only can be used to offset tax obligations that companies have with the Tax Authorities.
[4] Trade accounts receivable are denominated in U.S. dollars, are neither due nor impaired, do not yield interest and have no specific guarantees.
[5] These balances correspond to restricted bank accounts for payment of financial obligations held by the subsidiary Empresa de Generación Huanza S.A. (hereafter “Huanza”), according to the finance lease signed with Banco de Crédito del Perú in 2009. Below is presented the movement: