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Employee benefit plans (Tables) | 9 Months Ended
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Sep. 30, 2021
Retirement Benefits [Abstract] |
Schedule of net defined benefit plan costs | Net defined benefit plan costs for the three and nine months ended September 30, 2020 and 2021 include the following components:
| Three months ended September 30, |  | Nine months ended September 30,
| 2020 |  | 2021 |  | 2020 |  | 2021
Service costs | $ | 2,733 |  |  | $ | 3,454 |  |  | $ | 8,402 |  |  | $ | 10,528 |
Interest costs | 1,267 |  | 1,363 |  |  | 3,898 |  | 4,135
Amortization of actuarial loss | 615 |  | 558 |  |  | 1,883 |  | 1,704
Expected return on plan assets | (1,108) |  |  | (1,534) |  |  | (3,406) |  |  | (4,605) |
Net defined benefit plan costs | $ | 3,507 |  |  | $ | 3,841 |  |  | $ | 10,777 |  |  | $ | 11,762 |
Schedule of amounts contributed to defined contribution plans in various jurisdictions | During the three and nine months ended September 30, 2020 and 2021, the Company contributed the following amounts to defined contribution plans in various jurisdictions:
| Three months ended September 30, |  | Nine months ended September 30,
| 2020 |  | 2021 |  | 2020 |  | 2021
India | $ | 7,289 |  |  | $ | 9,637 |  |  | $ | 22,362 |  |  | $ | 27,445 |
U.S. | 4,654 |  | 5,020 |  |  | 13,935 |  | 15,508
U.K. | 4,547 |  | 5,034 |  |  | 13,977 |  | 14,352
China | 4,503 |  | 6,362 |  |  | 11,243 |  | 18,433
Other regions | 3,189 |  | 3,913 |  |  | 8,806 |  | 11,155
Total | $ | 24,182 |  |  | $ | 29,966 |  |  | $ | 70,323 |  |  | $ | 86,893 |

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- Definition Tabular disclosure of defined contribution pension plans or defined contribution other postretirement plans, separately for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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