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Accounts Receivable, Net | 12 Months Ended
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Dec. 31, 2021
Receivables [Abstract] |
Accounts Receivable, Net | ACCOUNTS RECEIVABLE, NET Accounts receivable, net balances at December 31, 2021 and 2020 were as follows (in thousands):
| 2021 |  | 2020
Trade accounts receivable | $ | 190,710 |  |  | $ | 167,575 |
Unbilled revenue, at net realizable value | 67,616 |  |  | 63,494 |
Total accounts receivable | 258,326 |  |  | 231,069 |
Allowance for doubtful accounts | (16,158) |  |  | (14,894) |
Accounts receivable, net | $ | 242,168 |  |  | $ | 216,175 |
Changes in the allowance for doubtful accounts on accounts receivable are as follows (in thousands):
| 2021 |  | 2020 |  | 2019
Balance at beginning of period | $ | (14,894) |  |  | $ | (14,379) |  |  | $ | (13,389) |
Provision | (9,422) |  |  | (9,323) |  |  | (8,433) |
Charge-offs, net of recoveries | 8,158 |  |  | 8,808 |  |  | 7,443 |
Balance at end of period | $ | (16,158) |  |  | $ | (14,894) |  |  | $ | (14,379) |

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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- References No definition available. + Details
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