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Financial obligations (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Financial obligations [Line Items]
Gross non current financial liabilities	$ 545,022	$ 552,895
Debt issuance costs	(4,126)	(3,803)
Non-current financial liabilities	540,896	549,092
Between 1 and 2 years [member]
Disclosure of Financial obligations [Line Items]
Gross non current financial liabilities	278,397	125,215
Between 2 and 5 years [member]
Disclosure of Financial obligations [Line Items]
Gross non current financial liabilities	$ 266,625	$ 427,680

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- References

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- Definition

The amount of long term financial obligations before deducting debt issuance costs.

+ References

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- Definition

The amount of interest and other costs that an entity incurs in connection with the borrowing of funds.

+ References

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

The amount of non-current financial liabilities. [Refer: Financial liabilities]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2018-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_25&doctype=Standard
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