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Accounts receivable, net of allowance for credit losses | 9 Months Ended
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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 326 | 4,185 |  |  | — |
Adjusted balance as of January 1 | $ | 34,154 |  |  | $ | 27,707 |
Additions due to acquisitions | 200 |  |  | — |
Additions charged/reversal released to cost and expense | 3,307 |  |  | 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.

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- Definition The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196772 + Details
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