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Financial obligations (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of Financial obligations [Line Items]
Gross non current financial liabilities	$ 552,895	$ 555,351
Debt issuance costs	(3,803)	(3,119)
Non-current financial liabilities	549,092	552,232
Between 1 and 2 years [member]
Disclosure of Financial obligations [Line Items]
Gross non current financial liabilities	125,215	81,057
Between 2 and 5 years [member]
Disclosure of Financial obligations [Line Items]
Gross non current financial liabilities	$ 427,680	$ 474,294

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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
-Number 1
-IssueDate 2017-01-01
-Paragraph 112
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard
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