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Financial instruments (Details 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of financial instruments [Line Items] |  |  |
Amortized Cost |  | $ 25,592 | $ 31,392
Unrealized Gain |  | 29 | 20
Unrealized Loss |  | 486 | 805
Fair Value |  | 25,135 | 30,607
Corporate debt [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Amortized Cost |  |  | 13,954
Unrealized Gain |  |  | 20
Unrealized Loss |  |  | 65
Fair Value |  |  | 13,909
Sovereign debts [Member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Amortized Cost |  | 16,962 | 17,438
Unrealized Gain |  | 29 | 0
Unrealized Loss |  | 258 | 740
Fair Value |  | 16,733 | 16,698
Equity investments [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Amortized Cost | [1] | 8,630 |
Unrealized Gain | [1] | 0 |
Unrealized Loss | [1] | 228 |
Fair Value | [1] | 8,402 |
Brazil [Member] | Corporate debt [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Amortized Cost |  |  | 3,144
Unrealized Gain |  |  | 0
Unrealized Loss |  |  | 62
Fair Value |  |  | 3,082
Brazil [Member] | Sovereign debts [Member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Amortized Cost |  | 2,937 | 2,926
Unrealized Gain |  | 29 | 0
Unrealized Loss |  | 12 | 140
Fair Value |  | 2,954 | 2,786
Brazil [Member] | Equity investments [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Amortized Cost | [1] | 8,630 |
Unrealized Gain | [1] | 0 |
Unrealized Loss | [1] | 228 |
Fair Value | [1] | 8,402 |
Venezuela [Member] | Corporate debt [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Amortized Cost |  |  | 10,810
Unrealized Gain |  |  | 20
Unrealized Loss |  |  | 3
Fair Value |  |  | 10,827
Chile [Member] | Sovereign debts [Member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Amortized Cost |  | 5,182 | 5,229
Unrealized Gain |  | 0 | 0
Unrealized Loss |  | 35 | 59
Fair Value |  | 5,147 | 5,170
Trinidad and Tobago [Member] | Sovereign debts [Member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Amortized Cost |  | 8,843 | 9,283
Unrealized Gain |  | 0 | 0
Unrealized Loss |  | 211 | 541
Fair Value |  | $ 8,632 | $ 8,742
[1] | Equity instruments were initially recognized at fair value. These equity instruments correspond to equity securities classified with the irrevocable option of changes in OCI.

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- Definition Theunrealized gainis a profit resulting from an investment. + References No definition available. + Details
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- Definition Theunrealized lossis alossthat results from holding onto an asset after it has decreased in price, rather than selling it and realizing theloss. + References No definition available. + Details
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- Definition The amount of financial assets at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 8 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_8_h&doctype=Standard -URIDate 2017-03-09 + Details
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