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Financial instruments (Details 27) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of financial instruments [Line Items] |  |  |
Interest expenses - borrowings and debt | $ 63,417 | $ 70,558 | $ 63,045
Fair value hedges [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Gain (loss) on derivatives | 14,281 | 19,335 | (15,909)
Gain (loss) on hedge item | (37,758) | (44,474) | 276
Net gain (loss) | (23,477) | (25,139) | (15,633)
Interest rate swap contract [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Interest income - securities at FVOCI | 350 | 976 | 467
Interest income loans at amortized cost | 148 | 1,998 | 3,611
Interest expenses - borrowings and debt | (14,846) | (23,703) | (17,758)
Derivative financial instruments and hedging | 101 | 101 | (153)
Interest rate swap contract [member] | Fair value hedges [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Interest income - securities at FVOCI | 476 | 1,593 | 1,514
Interest income loans at amortized cost | 160 | 2,023 | 3,987
Interest expenses - borrowings and debt | (16,233) | (28,261) | (24,026)
Derivative financial instruments and hedging | 2,371 | 2,178 | 1,688
Interest rate swap contract [member] | Gainloss on hedge item [Member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Interest income - securities at FVOCI | (126) | (617) | (1,047)
Interest income loans at amortized cost | (12) | (25) | (376)
Interest expenses - borrowings and debt | 1,387 | 4,558 | 6,268
Derivative financial instruments and hedging | (2,270) | (2,077) | (1,841)
Cross-currency interest rate swaps [Member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Interest income loans at amortized cost | 946 | 556 | 213
Interest expenses - borrowings and debt | (8,417) | (5,988) | (3,041)
Derivative financial instruments and hedging | (1,759) | 921 | 1,028
Cross-currency interest rate swaps [Member] | Fair value hedges [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Interest income loans at amortized cost | 2,442 | 928 | 348
Interest expenses - borrowings and debt | (10,265) | (6,183) | (3,785)
Derivative financial instruments and hedging | (16,709) | (16,752) | 20,550
Cross-currency interest rate swaps [Member] | Gainloss on hedge item [Member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Interest income loans at amortized cost | (1,496) | (372) | (135)
Interest expenses - borrowings and debt | 1,848 | 195 | 744
Derivative financial instruments and hedging | $ 14,950 | $ 17,673 | $ (19,522)

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- Definition The gain (loss) on hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24C_a_i&doctype=Standard -URIDate 2017-03-09 + Details
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