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Allowance for credit losses (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Changes in the allowance for credit losses  
Write-offs $ (253)
Impact of ASU 2016-13 adoption  
Changes in the allowance for credit losses  
Beginning Balance 4,135
Provision 290
Net foreign currency translation (2)
Ending Balance $ 4,170