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Employee benefit plans (Tables) | 3 Months Ended
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Mar. 31, 2016
Net Defined Benefit Plan Costs | Net defined benefit plan costs for the three months ended March 31, 2015 and 2016 include the following components:
|  | Three months ended March 31, |
|  | 2015 |  |  | 2016 |
Service costs |  | $ | 1,384 |  |  | $ | 1,403 |
Interest costs |  |  | 678 |  |  |  | 698 |
Amortization of actuarial loss |  |  | 85 |  |  |  | 56 |
Expected return on plan assets |  |  | (549 | ) |  |  | (486 | )
Net defined benefit plan costs |  | $ | 1,598 |  |  | $ | 1,671 |
Amount Contributed to Defined Contribution Plans in Various Jurisdictions | During the three months ended March 31, 2015 and 2016, the Company contributed the following amounts to defined contribution plans in various jurisdictions:
|  | Three months ended March 31, |
|  | 2015 |  |  | 2016 |
India |  | $ | 3,909 |  |  | $ | 4,303 |
U.S. |  |  | 2,628 |  |  |  | 3,532 |
U.K. |  |  | 1,040 |  |  |  | 1,652 |
China |  |  | 3,516 |  |  |  | 3,753 |
Other regions |  |  | 1,106 |  |  |  | 1,265 |
Total |  | $ | 12,199 |  |  | $ | 14,505 |

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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