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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:

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