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Allowance for credit losses (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 01, 2020
Mar. 31, 2020
Changes in the allowance for credit losses    
Beginning Balance $ 2,524 $ 2,524
Impact of ASU 2016-13 adoption    
Changes in the allowance for credit losses    
Provision 288 360
Net foreign currency translation   (7)
Ending Balance $ 2,812 $ 3,165