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Financial instruments (Details 25) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of financial instruments [Line Items] |  |
Nominal Amount | $ 1,527,117 | $ 2,218,625
Carrying amount of the hedging instrument, Asset | 13,338 | 9,352
Carrying amount of the hedging instrument, Liability | (34,943) | (59,686)
Changes in fair value used for calculating hedge ineffectiveness | 28,649 | (27,640)
Interest rate swaps | Fair value hedges: |  |
Disclosure of financial instruments [Line Items] |  |
Nominal Amount | 367,500 | 796,202
Carrying amount of the hedging instrument, Asset | 0 | 40
Carrying amount of the hedging instrument, Liability | (4,361) | (2,005)
Changes in fair value used for calculating hedge ineffectiveness | (2,394) | (2,199)
Interest rate swaps | Cash flow hedges: |  |
Disclosure of financial instruments [Line Items] |  |
Nominal Amount | 595,000 | 752,000
Carrying amount of the hedging instrument, Asset | 127 | 323
Carrying amount of the hedging instrument, Liability | (428) | (1,699)
Changes in fair value used for calculating hedge ineffectiveness | 995 | 696
Cross-currency interest rate swaps | Fair value hedges: |  |
Disclosure of financial instruments [Line Items] |  |
Nominal Amount | 306,961 | 291,065
Carrying amount of the hedging instrument, Asset | 3,672 | 2,561
Carrying amount of the hedging instrument, Liability | (30,154) | (44,944)
Changes in fair value used for calculating hedge ineffectiveness | 15,900 | (19,316)
Cross-currency interest rate swaps | Cash flow hedges: |  |
Disclosure of financial instruments [Line Items] |  |
Nominal Amount | 23,025 | 23,025
Carrying amount of the hedging instrument, Asset | 879 | 0
Carrying amount of the hedging instrument, Liability | 0 | (1,254)
Changes in fair value used for calculating hedge ineffectiveness | 2,132 | (1,313)
Foreign exchange forward | Cash flow hedges: |  |
Disclosure of financial instruments [Line Items] |  |
Nominal Amount | 225,388 | 352,553
Carrying amount of the hedging instrument, Asset | 8,610 | 6,428
Carrying amount of the hedging instrument, Liability | 0 | (9,653)
Changes in fair value used for calculating hedge ineffectiveness | 11,835 | (5,093)
Foreign exchange forward | Net investment hedges: |  |
Disclosure of financial instruments [Line Items] |  |
Nominal Amount | 9,243 | 3,780
Carrying amount of the hedging instrument, Asset | 50 | 0
Carrying amount of the hedging instrument, Liability | 0 | (131)
Changes in fair value used for calculating hedge ineffectiveness | $ 181 | $ (415)

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- Definition The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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