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Accounts Receivable | 12 Months Ended
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Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract] |
Accounts Receivable | Accounts Receivable Net accounts receivable consisted of the following as of December 31, 2023 and 2022 (in thousands):
| December 31, 2023 |  | December 31, 2022
Trade accounts receivable | $ | 516,175 |  |  | $ | 490,162 |
Unbilled accounts receivable | 211,596 |  |  | 194,961 |
Gross accounts receivable | 727,771 |  |  | 685,123 |
Allowances for current expected credit losses and other reserves | (3,469) |  |  | (5,917) |
Accounts receivable, net | $ | 724,302 |  |  | $ | 679,206 |
A summary of activity in the accounts receivable allowance for current expected credit losses and other reserves for the years ended December 31, 2023, 2022 and 2021 was as follows (in thousands):
| 2023 |  | 2022 |  | 2021
Beginning balance | $ | 5,917 |  |  | $ | 1,397 |  |  | $ | 1,822 |
Charges to income from operations | 13,431 |  |  | 9,292 |  |  | 4,576 |
Collections from customers previously reserved and other | (15,879) |  |  | (4,772) |  |  | (5,001) |
Ending balance | $ | 3,469 |  |  | $ | 5,917 |  |  | $ | 1,397 |
Charges to income from operations primarily represents charges to provision for doubtful accounts for increases in the allowance for current expected credit losses.

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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 -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//310-10/tableOfContent + Details
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