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Risk management (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statement of financial risk management [Line Items]    
Financial assets held for managing liquidity risk $ 619 $ 1,008
United States of America [Member]    
Statement of financial risk management [Line Items]    
Financial assets held for managing liquidity risk 612 591
Other O.E.C.D. [Member]    
Statement of financial risk management [Line Items]    
Financial assets held for managing liquidity risk 0 409
Multilateral [Member]    
Statement of financial risk management [Line Items]    
Financial assets held for managing liquidity risk 0 0
Latin America [Member]    
Statement of financial risk management [Line Items]    
Financial assets held for managing liquidity risk $ 7 $ 8