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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2021
Revenue from Contract with Customer [Abstract] |
Summary of Total Receivables, Net | Total receivables, net is comprised of the following (in thousands):
| December 31,
| 2021 |  | 2020
Billed receivables | $ | 162,479 |  |  | $ | 179,177 |
Allowance for doubtful accounts | (2,861) |  |  | (3,912) |
Billed receivables, net | 159,618 |  |  | 175,265 |
Current accrued receivables, net | 160,787 |  |  | 167,614 |
Long-term accrued receivables, net | 276,164 |  |  | 215,772 |
Total accrued receivables, net | 436,951 |  |  | 383,386 |
Total receivables, net | $ | 596,569 |  |  | $ | 558,651 |
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,
| 2021 |  | 2020 |  | 2019
Balance, beginning of period | $ | (3,912) |  |  | $ | (5,149) |  |  | $ | (3,912) |
Provision (increase) decrease | 1,125 |  |  | 374 |  |  | (2,561) |
Amounts written off, net of recoveries | (82) |  |  | 941 |  |  | 1,368 |
Foreign currency translation adjustments and other | 8 |  |  | (78) |  |  | (44) |
Balance, end of period | $ | (2,861) |  |  | $ | (3,912) |  |  | $ | (5,149) |
Summary of Changes in Deferred Revenue | Changes in deferred revenue were as follows (in thousands):
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 |
Deferral of revenue | 154,419 |
Recognition of deferred revenue | (171,530) |
Foreign currency translation | (1,952) |
Balance, December 31, 2021 | $ | 110,350 |

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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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