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Financial obligations - Long-term portion of the financial obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of Financial obligations [Line Items]
Gross non current financial liabilities	$ 309,120	$ 545,022
Debt issuance costs	3,124	4,126
Non-current financial liabilities	305,996	540,896
Between 1 and 2 years [member]
Disclosure of Financial obligations [Line Items]
Gross non current financial liabilities	133,091	278,397
Later than one year and not later than five years [member]
Disclosure of Financial obligations [Line Items]
Gross non current financial liabilities	127,463	$ 266,625
More than 5 years
Disclosure of Financial obligations [Line Items]
Gross non current financial liabilities	$ 48,566

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- References

No definition available.

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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 2019-01-01
-Paragraph 112
-Subparagraph c
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-URIDate 2019-03-27

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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 2019-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_25&doctype=Standard
-URIDate 2019-03-27

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