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Financial instruments - Fair value liabilities, narrative (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial assets [line items]    
Financial assets $ 1,285,583 $ 930,166
Financial assets measured at fair value | Derivative instruments | Cash flow hedges    
Disclosure of financial assets [line items]    
Financial assets $ 3,371 $ 10