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Revenue (Tables) | 9 Months Ended
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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 |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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