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Financial instruments (Details 8) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of financial instruments [Line Items] |  |  |  |  |
Amortized Cost | [2] | $ 69,130 | [1] | $ 77,816 | [3]
Gross Gain |  | 70 |  | 269 |
Gross Loss |  | 194 |  | 1,679 |
Fair Value |  | 69,006 |  | 76,406 |
Corporate debt [member] |  |  |  |  |
Disclosure of financial instruments [Line Items] |  |  |  |  |
Amortized Cost |  | 11,463 | [1] | 7,614 | [3]
Gross Gain |  | 3 |  | 0 |
Gross Loss |  | 0 |  | 146 |
Fair Value |  | 11,466 |  | 7,468 |
Sovereign debt [member] |  |  |  |  |
Disclosure of financial instruments [Line Items] |  |  |  |  |
Amortized Cost |  | 57,667 | [1] | 70,202 | [3]
Gross Gain |  | 67 |  | 269 |
Gross Loss |  | 194 |  | 1,533 |
Fair Value |  | 57,540 |  | 68,938 |
Brazil [Member] | Corporate debt [member] |  |  |  |  |
Disclosure of financial instruments [Line Items] |  |  |  |  |
Amortized Cost |  | 1,485 | [1] | 4,614 | [3]
Gross Gain |  | 3 |  | 0 |
Gross Loss |  | 0 |  | 146 |
Fair Value |  | 1,488 |  | 4,468 |
Brazil [Member] | Sovereign debt [member] |  |  |  |  |
Disclosure of financial instruments [Line Items] |  |  |  |  |
Amortized Cost | [3] |  |  | 11,179 |
Gross Gain |  |  |  | 37 |
Gross Loss |  |  |  | 194 |
Fair Value |  |  |  | 11,022 |
Panama [Member] | Corporate debt [member] |  |  |  |  |
Disclosure of financial instruments [Line Items] |  |  |  |  |
Amortized Cost |  | 9,978 | [1] | 3,000 | [3]
Gross Gain |  | 0 |  | 0 |
Gross Loss |  | 0 |  | 0 |
Fair Value |  | 9,978 |  | 3,000 |
Panama [Member] | Sovereign debt [member] |  |  |  |  |
Disclosure of financial instruments [Line Items] |  |  |  |  |
Amortized Cost |  | 8,458 | [1] | 8,670 | [3]
Gross Gain |  | 0 |  | 198 |
Gross Loss |  | 11 |  | 0 |
Fair Value |  | 8,447 |  | 8,868 |
Colombia [Member] | Sovereign debt [member] |  |  |  |  |
Disclosure of financial instruments [Line Items] |  |  |  |  |
Amortized Cost |  | 29,006 | [1] | 29,812 | [3]
Gross Gain |  | 67 |  | 34 |
Gross Loss |  | 16 |  | 280 |
Fair Value |  | 29,057 |  | 29,566 |
Mexico [Member] | Sovereign debt [member] |  |  |  |  |
Disclosure of financial instruments [Line Items] |  |  |  |  |
Amortized Cost |  | 20,203 | [1] | 20,541 | [3]
Gross Gain |  | 0 |  | 0 |
Gross Loss |  | 167 |  | 1,059 |
Fair Value |  | $ 20,036 |  | $ 19,482 |
[1] | Amounts do not include allowance for expected credit losses of US196.
[2] | Current ratings as of December 31, 2017 and 2016, respectively.
[3] | Amounts do not include allowance for expected credit losses of US$602.

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