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Financial obligations (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 28, 2018 | Jun. 27, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of Financial obligations [Line Items] |  |  |  |  |
Notional amount |  |  | $ 275,000,000 | $ 275,000,000 | $ 275,000,000
Borrowings, interest rate basis |  | three months plus 2.15% | Three-month Libor plus 3% |  |
Borrowings, adjustment to interest rate basis | 2.15% |  | 3.00% |  |
Borrowings, maturity | Apr. 2022 |  |  |  |
Borrowings Modified Repayment Terms | 5 semi-annual installments |  |  |  |
Borrowings Periodic Repayment Amount |  | $ 55,000,000 |  |  |
Empresa de Generacion Huanza S.A. [Member] |  |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |  |
Finance Lease Additional Conditions |  |  |  | Debt Service Coverage Ratio greater than 1.1.Minimum Net Worth of US$30,000,000. |

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- Definition Represents repayment terms of borrowings + References No definition available. + Details
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- Definition The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The maturity of borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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