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Financial instruments (Details 10) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of financial instruments [Line Items] |  |  |  |  |
Amortized Cost | [2] | $ 69,130 | [1] | $ 77,816 | [3]
Rating 1-4 [member] |  |  |  |  |
Disclosure of financial instruments [Line Items] |  |  |  |  |
Amortized Cost | [2] | 57,667 |  | 76,333 |
Rating 5-6 [member] |  |  |  |  |
Disclosure of financial instruments [Line Items] |  |  |  |  |
Amortized Cost | [2] | 11,463 |  | 1,483 |
Rating 7 [member] |  |  |  |  |
Disclosure of financial instruments [Line Items] |  |  |  |  |
Amortized Cost | [2] | 0 |  | 0 |
Rating 8 [member] |  |  |  |  |
Disclosure of financial instruments [Line Items] |  |  |  |  |
Amortized Cost | [2] | 0 |  | 0 |
Rating 9 [member] |  |  |  |  |
Disclosure of financial instruments [Line Items] |  |  |  |  |
Amortized Cost | [2] | 0 |  | 0 |
Rating 10 [member] |  |  |  |  |
Disclosure of financial instruments [Line Items] |  |  |  |  |
Amortized Cost | [2] | $ 0 |  | $ 0 |
[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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