Revenue (Tables)

3 Months Ended

Mar. 31, 2021

Revenue from Contract with Customer [Abstract]

Summary of Total Receivables, Net

Total receivables, net is comprised of the following (in thousands):

	March 31, 2021		December 31, 2020
Billed receivables	$	132,644	$	179,177
Allowance for doubtful accounts	(3,338)		(3,912)
Billed receivables, net	129,306		175,265
Current accrued receivables, net	151,080		167,614
Long-term accrued receivables, net	199,590		215,772
Total accrued receivables, net	350,670		383,386
Total receivables, net	$	479,976	$	558,651

Summary of Changes in Deferred Revenue

Changes in deferred revenue were as follows (in thousands):

Balance, December 31, 2020	$	129,413
Deferral of revenue	38,383
Recognition of deferred revenue	(30,099)
Foreign currency translation	(497)
Balance, March 31, 2021	$	137,200