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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2019
Revenue from Contract with Customer [Abstract] |
Summary of Total Receivables, Net | Total receivables, net is comprised of the following (in thousands):
|  | December 31,
|  | 2019 |  | 2018
Billed receivables |  | $ | 213,654 |  |  | $ | 239,275 |
Allowance for doubtful accounts |  | (5,149 | ) |  | (3,912 | )
Billed receivables, net |  | 208,505 |  |  | 235,363 |
Accrued receivables |  | 399,302 |  |  | 336,858 |
Significant financing component |  | (35,569 | ) |  | (35,029 | )
Total accrued receivables, net |  | 363,733 |  |  | 301,829 |
Less: current accrued receivables |  | 161,714 |  |  | 123,053 |
Less: current significant financing component |  | (11,022 | ) |  | (10,234 | )
Total long-term accrued receivables, net |  | 213,041 |  |  | 189,010 |
Total receivables, net |  | $ | 572,238 |  |  | $ | 537,192 |
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,
| 2019 |  | 2018 |  | 2017
Balance, beginning of period | $ | (3,912 | ) |  | $ | (4,799 | ) |  | $ | (3,873 | )
Provision increase | (2,561 | ) |  | (1,505 | ) |  | (2,086 | )
Amounts written off, net of recoveries | 1,368 |  |  | 2,269 |  |  | 1,305 |
Foreign currency translation adjustments and other | (44 | ) |  | 123 |  |  | (145 | )
Balance, end of period | $ | (5,149 | ) |  | $ | (3,912 | ) |  | $ | (4,799 | )
Summary of Changes in Deferred Revenue | Changes in deferred revenue were as follows (in thousands):
Balance, January 1, 2018 | $ | 145,344 |
Deferral of revenue | 215,188 |
Recognition of deferred revenue | (200,061 | )
Foreign currency translation | (4,336 | )
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 |

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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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