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Financial instruments (Details 9) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial instruments [Line Items]    
Amortized Cost [2] $ 69,130 [1] $ 77,816 [3]
Fair Value 69,006 76,406
Due within 1 year [member]    
Disclosure of financial instruments [Line Items]    
Amortized Cost 7,978 3,988
Fair Value 7,978 4,025
After 1 year but within 5 years [member]    
Disclosure of financial instruments [Line Items]    
Amortized Cost 61,152 68,537
Fair Value 61,028 67,358
After 5 years but within 10 years [member]    
Disclosure of financial instruments [Line Items]    
Amortized Cost 0 5,291
Fair Value $ 0 $ 5,023
[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.