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Revenue (Tables)
 9 Months Ended
Sep. 30, 2019
Revenue from Contract with Customer [Abstract]  
Summary of Total Receivables, Net
Total receivables, net is comprised of the following (in thousands):
 
September 30,
2019
 
December 31,
2018
Billed receivables
$
187,080

 
$
239,275

Allowance for doubtful accounts
(3,790
)
 
(3,912
)
Billed receivables, net
183,290

 
235,363

Accrued receivables
365,478

 
336,858

Significant financing component
(33,109
)
 
(35,029
)
Total accrued receivables, net
332,369

 
301,829

Less: current accrued receivables
152,668

 
123,053

Less: current significant financing component
(10,625
)
 
(10,234
)
Total long-term accrued receivables, net
190,326

 
189,010

Total receivables, net
$
515,659

 
$
537,192
Summary of Changes in Deferred Revenue Changes in deferred revenue were as follows (in thousands):
Balance, December 31, 2018
$
156,135

Deferral of revenue
121,310

Recognition of deferred revenue
(139,070
)
Foreign currency translation
(1,154
)
Balance, September 30, 2019
$
137,221