Accounts Receivable, Net (Tables)

12 Months Ended

Dec. 31, 2021

Receivables [Abstract]

Schedule of Accounts Receivable, Net

Accounts receivable, net balances at December 31, 2021 and 2020 were as follows (in thousands):

	2021		2020
Trade accounts receivable	$	190,710	$	167,575
Unbilled revenue, at net realizable value	67,616		63,494
Total accounts receivable	258,326		231,069
Allowance for doubtful accounts	(16,158)		(14,894)
Accounts receivable, net	$	242,168	$	216,175

Schedule of Changes in the Allowance for Doubtful Accounts on Accounts Receivable

Changes in the allowance for doubtful accounts on accounts receivable are as follows (in thousands):

	2021		2020		2019
Balance at beginning of period	$	(14,894)	$	(14,379)	$	(13,389)
Provision	(9,422)		(9,323)		(8,433)
Charge-offs, net of recoveries	8,158		8,808		7,443
Balance at end of period	$	(16,158)	$	(14,894)	$	(14,379)