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Financial instruments by category - Fair values based on recognized valuation methods (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]  
Derivative financial assets (liabilities) $ 12
Level 1 | Futures  
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]  
Derivative financial assets (liabilities) (166)
Level 2 | NDF  
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]  
Derivative financial assets (liabilities) $ 178