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Allowance for credit losses (Details) - USD ($)
$ in Thousands
9 Months Ended
Jan. 01, 2020
Sep. 30, 2020
Changes in the allowance for credit losses    
Write-offs   $ (488)
Ending Balance $ 2,524  
Impact of ASU 2016-13 adoption    
Changes in the allowance for credit losses    
Provision 288 1,510
Net foreign currency translation   3
Ending Balance $ 2,812 $ 3,837