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Retirement Plans | 3 Months Ended
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Mar. 31, 2013
Retirement Plans | M. Retirement Plans Defined Benefit Pension Plans Teradyne has defined benefit pension plans covering a portion of domestic employees and employees of certain non-U.S. subsidiaries. Benefits under these plans are based on employees’ years of service and compensation. Teradyne’s funding policy is to make contributions to these plans in accordance with local laws and to the extent that such contributions are tax deductible. The assets of these plans consist primarily of fixed income and equity securities. In addition, Teradyne has an unfunded supplemental executive defined benefit plan in the United States to provide retirement benefits in excess of levels allowed by the Employment Retirement Income Security Act (“ERISA”) and the Internal Revenue Code (“IRC”), as well as unfunded foreign plans. Teradyne’s net periodic pension cost was comprised of the following:
|  | For the Three Months Ended |
|  | March 31, 2013 |  |  | April 1, 2012 |
|  | (in thousands) |
Service cost |  | $ | 834 |  |  | $ | 722 |
Interest cost |  |  | 3,294 |  |  |  | 4,083 |
Expected return on plan assets |  |  | (3,630 | ) |  |  | (4,087 | )
Amortization of unrecognized prior service cost |  |  | 41 |  |  |  | 58 |
Settlement loss |  |  | 76 |  |  |  | — |
Total net periodic pension cost |  | $ | 615 |  |  | $ | 776 |
In the three months ended March 31, 2013, Teradyne contributed $0.4 million to the U.S. supplemental executive defined benefit pension plan and $0.3 million to certain qualified plans for non-U.S. subsidiaries. Postretirement Benefit Plans In addition to receiving pension benefits, U.S. Teradyne employees who meet early retirement eligibility requirements as of their termination dates may participate in Teradyne’s Welfare Plan, which includes death, and medical and dental benefits up to age 65. Death benefits provide a fixed sum to retirees’ survivors and are available to all retirees. Substantially all of Teradyne’s current U.S. employees could become eligible for these benefits, and the existing benefit obligation relates primarily to those employees. Teradyne’s net periodic postretirement benefit was comprised of the following:
|  | For the Three Months Ended |
|  | March 31, 2013 |  |  | April, 2012 |
|  | (in thousands) |
Service cost |  | $ | 16 |  |  | $ | 19 |
Interest cost |  |  | 87 |  |  |  | 110 |
Amortization of unrecognized prior service benefit |  |  | (150 | ) |  |  | (150 | )
Total net periodic postretirement benefit |  | $ | (47 | ) |  | $ | (21 | )

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7, 21, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS106-2 -Paragraph 20, 21, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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