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Accounts Receivable and Allowance for Expected Credit Losses | 12 Months Ended
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Dec. 31, 2020
Allowance For Doubtful Accounts And Unbilled Services [Abstract] |
Accounts Receivable and Allowance for Expected Credit Losses | Accounts Receivable and Allowance for Expected Credit Losses The following table summarizes the components of “Accounts receivable, net” as presented on the Consolidated Balance Sheets:
| December 31,
| 2020 |  | 2019
Accounts receivable: |  |  |
Billed receivables | $ | 513,459 |  |  | $ | 482,333 |
Unbilled receivables | 236,285 |  |  | 246,205 |
Allowance for expected credit losses | (38,387) |  |  | (35,166) |
Accounts receivable, net | $ | 711,357 |  |  | $ | 693,372 |
The following table summarizes total provision for expected credit losses and write-offs:
| Year Ended December 31,
| 2020 |  | 2019 |  | 2018
Provision for expected credit losses | $ | 19,692 |  |  | $ | 19,602 |  |  | $ | 17,872 |
Write-offs | $ | 24,717 |  |  | $ | 12,734 |  |  | $ | 21,465 |
Our provision for expected credit losses includes recoveries, direct write-offs and charges to other accounts. Billed accounts receivables are written off when the potential for recovery is considered remote. See Note 1, "Description of Business and Summary of Significant Accounting Policies” for additional information on our accounting policies for revenue recognition and allowance for expected credit losses.

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