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Financial instruments (Details 30) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of financial instruments [Line Items] |  |
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss | $ 310 | $ 639
Interest Rate Risk [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss | 302 | 623
Foreign exchange risk [member] |  |
Disclosure of financial instruments [Line Items] |  |
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss | 8 | 16
USD OIS [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss | 14 | 44
USD OIS [Member] | Interest Rate Risk [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss | 22 | 19
USD OIS [Member] | Foreign exchange risk [member] |  |
Disclosure of financial instruments [Line Items] |  |
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss | (8) | 25
Tenor [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss | 296 | 0
Tenor [Member] | Interest Rate Risk [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss | 296 | 0
Tenor [Member] | Foreign exchange risk [member] |  |
Disclosure of financial instruments [Line Items] |  |
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss | 0 | 0
Xccy basis [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss | 17 | (4)
Xccy basis [Member] | Interest Rate Risk [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss | 0 | 0
Xccy basis [Member] | Foreign exchange risk [member] |  |
Disclosure of financial instruments [Line Items] |  |
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss | 17 | (4)
Credit spread [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss | (17) | 599
Credit spread [Member] | Interest Rate Risk [Member] |  |
Disclosure of financial instruments [Line Items] |  |
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss | (16) | 604
Credit spread [Member] | Foreign exchange risk [member] |  |
Disclosure of financial instruments [Line Items] |  |
Gains (losses) on ineffectiveness of cash flow hedges recognised in profit or loss | $ (1) | $ (5)

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- Definition The gains (losses) on the ineffective portion of cash flow hedges recognised in profit or loss. [Refer: Cash flow hedges [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_24_b&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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