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Accounts Receivable and Allowance for Expected Credit Losses (Tables)
 6 Months Ended
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 receivables287,040 236,285 
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,
2021202020212020
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.