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Financial instruments (Details 31) - 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 amounts not offset in the consolidated statement of financial position Financial instruments 0 0
Gross amounts not offset in the consolidated statement of financial position Cash collateral received (22,304) 0
Gross amounts not offset in the consolidated statement of financial position Net Amount (8,966) 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
Gross amounts not offset in the consolidated statement of financial position Financial instruments 0 0
Gross amounts not offset in the consolidated statement of financial position Cash collateral received (22,304) 0
Gross amounts not offset in the consolidated statement of financial position Net Amount (8,966) 9,352
Gross amount [member]    
Disclosure of financial instruments [Line Items]    
Gross amounts assets 13,338 9,352
Gross amount [member] | Derivative financial instruments hedging [Member]    
Disclosure of financial instruments [Line Items]    
Gross amounts assets $ 13,338 $ 9,352