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Revenue (Tables) | 12 Months Ended
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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,
|  | 2020 |  | 2019
Billed receivables |  | $ | 179,177 |  |  | $ | 213,654 |
Allowance for doubtful accounts |  | (3,912) |  |  | (5,149) |
Billed receivables, net |  | 175,265 |  |  | 208,505 |
Current accrued receivables, net |  | 167,614 |  |  | 150,692 |
Long-term accrued receivables, net |  | 215,772 |  |  | 213,041 |
Total accrued receivables, net |  | 383,386 |  |  | 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,
| 2020 |  | 2019 |  | 2018
Balance, beginning of period | $ | (5,149) |  |  | $ | (3,912) |  |  | $ | (4,799) |
Provision (increase) decrease | 374 |  |  | (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 revenue | 149,363 |
Recognition of deferred revenue | (141,313) |
Foreign currency translation | 2,424 |
Balance, December 31, 2020 | $ | 129,413 |

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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=121604090&loc=SL49130551-203045 + Details
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