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Accounts receivable, net of allowance for credit losses
 9 Months Ended
Sep. 30, 2021
Receivables [Abstract]  
Accounts receivable, net of allowance for credit losses Accounts receivable, net of allowance for credit losses
 
Accounts receivable were $908,727 and $980,698 and allowance for credit losses were $27,707 and $29,527, resulting in net accounts receivable balances of $881,020 and $951,171 as of December 31, 2020 and September 30, 2021, respectively.
The following table provides details of the Company’s allowance for credit losses on accounts receivable:
 
Year ended December 31, 2020 Nine months ended September 30, 2021
Opening balance as of January 1$29,969 $27,707 
Transition period adjustment on accounts receivables (through retained earnings) pursuant to adoption of ASC 3264,185 — 
Adjusted balance as of January 1$34,154 $27,707 
Additions due to acquisitions200 — 
Additions charged/reversal released to cost and expense3,307 2,953 
Deductions/effect of exchange rate fluctuations(9,954)(1,133)
Closing balance$27,707 $29,527 
 
In addition, deferred billings were $28,491 and $14,532 and allowance for credit losses on deferred billings were $3,134 and $2,593, resulting in net deferred billings balances of $25,357 and $11,939 as of December 31, 2020 and September 30, 2021, respectively.

Total credit losses on deferred billings of $3,134 as of December 31, 2020 includes $734 as a transition date adjustment through retained earnings pursuant to the adoption of ASC 326 and $2,400 as a charge for the year ended December 31, 2020. During the nine months ended September 30, 2021, the Company recorded a release of $541 to cost and expense on account of credit losses on deferred billings. Deferred billings, net of related allowance for credit losses, are included under “other assets” in the Company's consolidated balance sheet as of December 31, 2020 and September 30, 2021.