Accounts Receivable, Net (Tables)

9 Months Ended

Sep. 30, 2021

Receivables [Abstract]

Schedule of Accounts Receivable, Net

Accounts receivable, net, at September 30, 2021 and December 31, 2020 was as follows (in thousands):

	September 30, 2021		December 31, 2020
Trade accounts receivable	$	200,584	$	167,575
Unbilled revenue, at net realizable value	107,664		63,494
Total accounts receivable	308,248		231,069
Allowance for doubtful accounts	(14,358)		(14,894)
Accounts receivable, net	$	293,890	$	216,175

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

Changes to the allowance for doubtful accounts for the nine months ended September 30, 2021 and twelve months ended December 31, 2020 are as follows (in thousands):

	September 30, 2021		December 31, 2020
Balance at beginning of period	$	(14,894)	$	(14,379)
Provision	(4,450)		(9,323)
Charge-offs, net of recoveries	4,986		8,808
Allowance for doubtful accounts	$	(14,358)	$	(14,894)