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Accounts Receivable and Allowance for Expected Credit Losses
 12 Months Ended
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,
20202019
Accounts receivable:
Billed receivables$513,459 $482,333 
Unbilled receivables236,285 246,205 
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,
202020192018
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.