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Financial instruments by category - Fair values based on recognized valuation methods (Details)
$ in Thousands
Dec. 31, 2022
USD ($)
Level 1 | Futures  
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]  
Derivative financial assets (liabilities) $ (2,689)
Level 1 | Non derivable future (“NDF”)  
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]  
Derivative financial assets (liabilities) 23
Level 1 | US-Treasury Bills  
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]  
Derivative financial assets (liabilities) 98,571
Level 2 | Non derivable future (“NDF”)  
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]  
Derivative financial assets (liabilities) (160)
Level 2 | Interest-rate swaps  
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]  
Derivative financial assets (liabilities) $ 5,111