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Financial instruments (Details 28) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Loans [Member] | Interest Rate Risk [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Line item in the statement of financial position | Loans | Loans
Carrying amount, assets | $ 0 | $ 18,502
Loans [Member] | Interest Rate Risk [Member] | Fair value hedges [member] |  |
Disclosure of financial instruments [Line Items] |  |
Thereof accumulated fair value adjustments, assets | $ 0 | $ 12
Loans [Member] | Currency risk [member] |  |
Disclosure of financial instruments [Line Items] |  |
Line item in the statement of financial position | Loans | Loans
Carrying amount, assets | $ 25,027 | $ 9,252
Loans [Member] | Currency risk [member] | Fair value hedges [member] |  |
Disclosure of financial instruments [Line Items] |  |
Thereof accumulated fair value adjustments, assets | $ 744 | $ 706
Issuances [Member] | Interest Rate Risk [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Line item in the statement of financial position | Short and long term borrowings and debt | Short and long term borrowings and debt
Carrying amount, liabilities | $ 355,000 | $ 755,000
Issuances [Member] | Interest Rate Risk [Member] | Fair value hedges [member] |  |
Disclosure of financial instruments [Line Items] |  |
Thereof accumulated fair value adjustments, liabilities | $ (4,411) | $ 2,089
Issuances [Member] | Currency risk [member] |  |
Disclosure of financial instruments [Line Items] |  |
Line item in the statement of financial position | Short and long term borrowings and debt | Short and long term borrowings and debt
Carrying amount, liabilities | $ (249,328) | $ (308,739)
Issuances [Member] | Currency risk [member] | Fair value hedges [member] |  |
Disclosure of financial instruments [Line Items] |  |
Thereof accumulated fair value adjustments, liabilities | $ (2,301) | $ (49)
Foreign exchange rate risk and FX [Member] | Currency risk [member] |  |
Disclosure of financial instruments [Line Items] |  |
Line item in the statement of financial position | Financial instruments at FVOCI | Financial instruments at FVOCI
Carrying amount, assets | $ 12,369 | $ 22,188
Foreign exchange rate risk and FX [Member] | Currency risk [member] | Fair value hedges [member] |  |
Disclosure of financial instruments [Line Items] |  |
Thereof accumulated fair value adjustments, assets | $ (32) | $ (232)

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- Definition The accumulated amount of fair value hedge adjustment on a hedged item that is included in the carrying amount of the hedged item, recognised in the statement of financial position as an asset. [Refer: Hedged items [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24B -Subparagraph a -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24B_a_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The accumulated amount of fair value hedge adjustment on a hedged item that is included in the carrying amount of the hedged item, recognised in the statement of financial position as a liability. [Refer: Hedged items [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24B -Subparagraph a -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24B_a_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The description of the line item in the statement of financial position that includes the hedged item. [Refer: Hedged items [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24B -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24B_a_iii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of a hedged item, recognised as an asset. [Refer: Hedged items [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24B -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24B_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of a hedged item, recognised as a liability. [Refer: Hedged items [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24B -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24B_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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