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Financial instruments (Details 6) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Disclosure of financial instruments [Line Items] |  |  |
Amortized Cost | [1] | $ 68,934 | $ 77,214
Fair Value |  | 25,135 | 30,607
Due within 1 year [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Amortized Cost |  | 0 | 0
Fair Value |  | 0 | 0
After 1 year but within 5 years [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Amortized Cost |  | 16,962 | 17,656
Fair Value |  | 16,733 | 16,994
After 5 years but within 10 years [member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Amortized Cost |  | 0 | 13,736
Fair Value |  | 0 | 13,613
Total Maturities [Member] |  |  |
Disclosure of financial instruments [Line Items] |  |  |
Amortized Cost |  | 16,962 | 31,392
Fair Value |  | $ 16,733 | $ 30,607
[1] | The carrying value of securities at amortized cost is net of the allowance for expected credit losses of $0.2 million for December 31, 2017 and $0.6 million for December 31, 2016.

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