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Revenue (Tables) | 9 Months Ended
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Sep. 30, 2021
Revenue from Contract with Customer [Abstract] |
Summary of Total Receivables, Net | Total receivables, net is comprised of the following (in thousands):
| September 30, 2021 |  | December 31, 2020
Billed receivables | $ | 147,247 |  |  | $ | 179,177 |
Allowance for doubtful accounts | (2,544) |  |  | (3,912) |
Billed receivables, net | 144,703 |  |  | 175,265 |
Current accrued receivables, net | 154,633 |  |  | 167,614 |
Long-term accrued receivables, net | 196,676 |  |  | 215,772 |
Total accrued receivables, net | 351,309 |  |  | 383,386 |
Total receivables, net | $ | 496,012 |  |  | $ | 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 | 112,008 |
Recognition of deferred revenue | (101,306) |
Foreign currency translation | (1,478) |
Balance, September 30, 2021 | $ | 138,637 |

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + 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=123351226&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=120391452&loc=d3e13212-122682 + Details
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