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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.

X

- Definition

Represents repayment terms of borrowings

+ References

No definition available.

+ Details

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- Definition

Represents amount of periodic payment.

+ References

No definition available.

+ Details

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- References

No definition available.

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- Definition

Represents conditions that needs to comply.

+ References

No definition available.

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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
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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
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- Definition

The maturity of borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
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-IssueDate 2018-01-01
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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
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-IssueDate 2018-01-01
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