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Financial instruments (Details 10) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
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.