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Accounts Receivable, Net (Tables) | 3 Months Ended
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Mar. 31, 2021
Receivables [Abstract] |
Schedule of Accounts Receivable, Net | Accounts receivable, net, at March 31, 2021 and December 31, 2020 were as follows (in thousands):
| March 31, 2021 |  | December 31, 2020
Trade accounts receivable | $ | 177,104 |  |  | $ | 167,575 |
Unbilled revenue, at net realizable value | 106,662 |  |  | 63,494 |
Total accounts receivable | 283,766 |  |  | 231,069 |
Allowance for doubtful accounts | (13,156) |  |  | (14,894) |
Accounts receivable, net | $ | 270,610 |  |  | $ | 216,175 |
Schedule of Changes in the Allowance for Doubtful Accounts on Accounts Receivable | Changes to the allowance for doubtful accounts for the three months ended March 31, 2021 and twelve months ended December 31, 2020 are as follows (in thousands):
| March 31, 2021 |  | December 31, 2020
Balance at beginning of period | $ | (14,894) |  |  | $ | (14,379) |
Provision | (390) |  |  | (9,323) |
Charge-offs, net of recoveries | 2,128 |  |  | 8,808 |
Allowance for doubtful accounts | $ | (13,156) |  |  | $ | (14,894) |

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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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