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Financial instruments by category - Financial assets and financial liabilities measured at fair value (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Derivative financial instruments $ 2,102 $ 1,435
Derivative financial liabilities (13,141) (1,423)
Level 1    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Derivative financial instruments 151 1,257
Derivative financial liabilities (12,984) (1,423)
Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Derivative financial instruments 1,951 178
Derivative financial liabilities $ (157) $ 0