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Financial instruments - Maturity of derivative liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities $ 105,120 $ 83,472
Within one year    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities 7,114 0
1-3 years    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities 17,057 8,481
3-5 years    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities 28,864 18,962
More than 5 years    
Disclosure of maturity analysis for derivative financial liabilities [line items]    
Derivative financial liabilities $ 52,085 $ 56,029