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Revenue (Tables)
 12 Months Ended
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]  
Summary of Total Receivables, Net
Total receivables, net is comprised of the following (in thousands):
December 31,
20202019
Billed receivables$179,177 $213,654 
Allowance for doubtful accounts(3,912)(5,149)
Billed receivables, net175,265 208,505 
Current accrued receivables, net167,614 150,692 
Long-term accrued receivables, net215,772 213,041 
Total accrued receivables, net383,386 363,733 
Total receivables, net$558,651 $572,238 
Summary of Allowance for Doubtful Accounts Receivable
The following reflects activity in the Company’s allowance for doubtful accounts receivable for the periods indicated (in thousands):
Years Ended December 31,
202020192018
Balance, beginning of period
$(5,149)$(3,912)$(4,799)
Provision (increase) decrease374 (2,561)(1,505)
Amounts written off, net of recoveries
941 1,368 2,269 
Foreign currency translation adjustments and other
(78)(44)123 
Balance, end of period
$(3,912)$(5,149)$(3,912)
Summary of Changes in Deferred Revenue
Changes in deferred revenue were as follows (in thousands):
Balance, December 31, 2018
$156,135 
Deferral of revenue
149,253 
Recognition of deferred revenue
(187,069)
Foreign currency translation
620 
Balance, December 31, 2019
118,939 
Deferral of revenue149,363 
Recognition of deferred revenue(141,313)
Foreign currency translation2,424 
Balance, December 31, 2020
$129,413