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Financial instruments by category - Financial assets and financial liabilities measured at fair value (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Derivative financial assets $ 1,585 $ 2,102
Derivative financial liabilities (1,283) (13,141)
Level 1    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Derivative financial assets 828 151
Derivative financial liabilities (1,283) (12,984)
Level 2    
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items]    
Derivative financial assets 757 1,951
Derivative financial liabilities $ 0 $ (157)