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Financial instruments (Details 5) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial instruments [Line Items]    
Financial assets measured at fair value through other comprehensive income $ 16,733 $ 30,607
Rating 1-4 [member]    
Disclosure of financial instruments [Line Items]    
Financial assets measured at fair value through other comprehensive income 16,733 30,607
Rating 5-6 [member]    
Disclosure of financial instruments [Line Items]    
Financial assets measured at fair value through other comprehensive income 0 0
Rating 7 [member]    
Disclosure of financial instruments [Line Items]    
Financial assets measured at fair value through other comprehensive income 0 0
Rating 8 [member]    
Disclosure of financial instruments [Line Items]    
Financial assets measured at fair value through other comprehensive income 0 0
Rating 9 [member]    
Disclosure of financial instruments [Line Items]    
Financial assets measured at fair value through other comprehensive income 0 0
Rating 10 [member]    
Disclosure of financial instruments [Line Items]    
Financial assets measured at fair value through other comprehensive income $ 0 $ 0