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Fair value measurement - Changes in Level 3 items (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2020
USD ($)
Changes in Level 3 liabilities  
Beginning Balance $ 3,100
Ending Balance 1,000
Derivative financial instruments | Level 3  
Changes in Level 3 liabilities  
Beginning Balance 3,075
Net losses recognized in profit or loss (2,015)
Currency translation effects 56
Ending Balance $ 1,004