Accounts Receivable, Net (Tables)

6 Months Ended

Jun. 30, 2021

Receivables [Abstract]

Schedule of Accounts Receivable, Net

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

	June 30, 2021		December 31, 2020
Trade accounts receivable	$	213,251	$	167,575
Unbilled revenue, at net realizable value	93,950		63,494
Total accounts receivable	307,201		231,069
Allowance for doubtful accounts	(14,705)		(14,894)
Accounts receivable, net	$	292,496	$	216,175

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

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

	June 30, 2021		December 31, 2020
Balance at beginning of period	$	(14,894)	$	(14,379)
Provision	(2,583)		(9,323)
Charge-offs, net of recoveries	2,772		8,808
Allowance for doubtful accounts	$	(14,705)	$	(14,894)