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Financial instruments (Details 32) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial instruments [Line Items]    
Gross amounts assets $ 13,338 $ 9,352
Gross amounts offset in the consolidated statement of financial position 0 0
Net amount of assets presented in the consolidated statement of financial position 13,338 9,352
Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Gross amounts assets 13,338 9,352
Derivative financial instruments hedging [Member]    
Disclosure of financial instruments [Line Items]    
Gross amounts offset in the consolidated statement of financial position 0 0
Net amount of assets presented in the consolidated statement of financial position 13,338 9,352
Derivative financial instruments hedging [Member] | Gross carrying amount [member]    
Disclosure of financial instruments [Line Items]    
Gross amounts assets $ 13,338 $ 9,352