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Fair value measurements (Narrative) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Fair Value Measurements [Abstract]    
Transfer from level 1 to 2 $ 0 $ 0
Transfer from level 2 to level 1 0 0
Transfer into level 3 0 0
Transfer out of level 3 $ 0 $ 0