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Financial instruments by category - Narrative (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of fair value measurement of assets [line items]    
Current financial assets available-for-sale $ 194 $ 3,828
Borrowings 501,132 479,732
Fair value    
Disclosure of fair value measurement of assets [line items]    
Current financial assets available-for-sale 194 3,828
Settlement receivables 31,898 34,361
Derivative financial assets 7,357 5,597
Term loan    
Disclosure of fair value measurement of assets [line items]    
Borrowings 131,842 $ 197,761
Term loan | Fair value    
Disclosure of fair value measurement of assets [line items]    
Borrowings $ 133,333