Accounts Receivable (Tables)

9 Months Ended

Sep. 30, 2021

Receivables [Abstract]

Schedule of Activity Related to the Allowance for Doubtful Accounts

The activity related to the allowance for doubtful accounts for the periods presented was as follows:

	Three months ended September 30,				Nine months ended September 30,
(in thousands)	2021		2020		2021		2020
Balance at beginning of period	$	7,334	$	7,743	$	7,698	$	5,338
Bad debt expense	626		113		324		2,821
Amount of receivables written off	(224)		(61)		(268)		(335)
Foreign currency translation and other	(74)		139		(92)		110
Balance at end of period	$	7,662	$	7,934	$	7,662	$	7,934