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Financial instruments (Details 3) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Financial instruments [Line Items]
Assets before allowances	$ 422,236	$ 488,798
Allowance for doubtful trade receivables	(21,384)	(19,904)
Assets for trade receivables, net	400,852	468,894
Receivables related to credit operations, current [Member]
Financial instruments [Line Items]
Assets before allowances	383,775	445,670
Allowance for doubtful trade receivables	(16,192)	(14,756)
Assets for trade receivables, net	367,583	430,914
Trade receivables, current [Member]
Financial instruments [Line Items]
Assets before allowances	383,775	445,670
Allowance for doubtful trade receivables	(16,192)	(14,756)
Assets for trade receivables, net	367,583	430,914
Prepayments, current [Member]
Financial instruments [Line Items]
Assets before allowances	21,092	16,990
Allowance for doubtful trade receivables	(783)	(843)
Assets for trade receivables, net	20,309	16,147
Other receivables, current [Member]
Financial instruments [Line Items]
Assets before allowances	15,659	23,863
Allowance for doubtful trade receivables	(4,409)	(4,305)
Assets for trade receivables, net	11,250	19,558
Current trade and other receivables [Member]
Financial instruments [Line Items]
Assets before allowances	36,751	40,853
Allowance for doubtful trade receivables	(5,192)	(5,148)
Assets for trade receivables, net	31,559	35,705
Other receivables, non-current [Member]
Financial instruments [Line Items]
Assets before allowances	1,710	2,275
Allowance for doubtful trade receivables	0	0
Assets for trade receivables, net	1,710	2,275
Non-current receivables [Member]
Financial instruments [Line Items]
Assets before allowances	1,710	2,275
Allowance for doubtful trade receivables	0	0
Assets for trade receivables, net	$ 1,710	$ 2,275

X

- Definition

The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b
-URIDate 2019-03-27

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X

- Definition

The amount of trade receivables and other receivables. [Refer: Trade receivables; Other receivables]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 54
-Subparagraph h
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_h&doctype=Standard
-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 78
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78_b&doctype=Standard
-URIDate 2019-03-27

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X

- References

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+ Details

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X

- Definition

The amount trade and other receivables before deducting allowances.

+ References

No definition available.

+ Details

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