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Accounts Receivable and Allowance for Expected Credit Losses (Tables) | 6 Months Ended
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Jun. 30, 2021
Allowance for Doubtful Accounts and Unbilled Services [Abstract] |
Schedule of Accounts Receivable | The following table summarizes the components of "Accounts receivable, net" as presented on the Condensed Consolidated Balance Sheets:
| June 30, 2021 |  | December 31, 2020
Accounts receivable: |  |  |
Billed receivables | $ | 598,624 |  |  | $ | 513,459 |
Unbilled receivables | 287,040 |  |  | 236,285 |
Allowance for expected credit losses | (39,543) |  |  | (38,387) |
Accounts receivable, net | $ | 846,121 |  |  | $ | 711,357 |
Schedule of Accounts Receivable, Writeoff | The following table summarizes the total provision for expected credit losses and write-offs:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Provision for expected credit losses (1) | $ | 3,404 |  |  | $ | 7,752 |  |  | $ | 8,236 |  |  | $ | 11,624 |
Write-offs | $ | 2,802 |  |  | $ | 7,459 |  |  | $ | 9,718 |  |  | $ | 13,525 |
(1) Adjustments to the allowance for expected credit losses are recorded to selling, general & administrative ("SG&A") expenses on the Condensed Consolidated Statements of Comprehensive Income.

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- Definition Allowance for Doubtful Accounts and Unbilled Services [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of allowance for credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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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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