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Retirement Plans (Tables) | 9 Months Ended
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Sep. 29, 2019
Defined Benefit Pension Plans |
Net Periodic Pension and Postretirement Benefit Costs | For the three and nine months ended September 29, 2019 and September 30, 2018, Teradyne’s net periodic pension cost was comprised of the following:
|  | For the Three Months Ended |
|  | September 29, 2019 |  |  | September 30, 2018 |
|  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |
|  | (in thousands) |
Service cost |  | $ | 402 |  |  | $ | 183 |  |  | $ | 538 |  |  | $ | 203 |
Interest cost |  |  | 1,797 |  |  |  | 168 |  |  |  | 1,750 |  |  |  | 177 |
Expected return on plan assets |  |  | (1,510 | ) |  |  | (7 | ) |  |  | (1,551 | ) |  |  | (5 | )
Amortization of prior service cost |  |  | — |  |  |  | — |  |  |  | 14 |  |  |  | — |
Settlement loss |  |  | — |  |  |  | — |  |  |  | 267 |  |  |  | — |
Total net periodic pension cost |  | $ | 689 |  |  | $ | 344 |  |  | $ | 1,018 |  |  | $ | 375 |
|  | For the Nine Months Ended |
|  | September 29, 2019 |  |  | September 30, 2018 |
|  | United States |  |  | Foreign |  |  | United States |  |  | Foreign |
|  | (in thousands) |
Service cost |  | $ | 1,206 |  |  | $ | 550 |  |  | $ | 1,657 |  |  | $ | 609 |
Interest cost |  |  | 5,392 |  |  |  | 505 |  |  |  | 7,188 |  |  |  | 532 |
Expected return on plan assets |  |  | (4,531 | ) |  |  | (21 | ) |  |  | (7,484 | ) |  |  | (15 | )
Amortization of prior service cost |  |  | — |  |  |  | — |  |  |  | 43 |  |  |  | — |
Net actuarial loss (gain) |  |  | 252 |  |  |  | — |  |  |  | (189 | ) |  |  | — |
Settlement loss |  |  | — |  |  |  | — |  |  |  | 345 |  |  |  | — |
Total net periodic pension cost |  | $ | 2,319 |  |  | $ | 1,034 |  |  | $ | 1,560 |  |  | $ | 1,126 |
Postretirement Benefit Plans |
Net Periodic Pension and Postretirement Benefit Costs | For the three and nine months ended September 29, 2019 and September 30, 2018, Teradyne’s net periodic postretirement benefit cost was comprised of the following:
|  | For the Three Months Ended |  |  | For the Nine Months Ended |
|  | September 29, 2019 |  |  | September 30, 2018 |  |  | September 29, 2019 |  |  | September 30, 2018 |
|  | (in thousands) |
Service cost |  | $ | 10 |  |  | $ | 10 |  |  | $ | 31 |  |  | $ | 29 |
Interest cost |  |  | 87 |  |  |  | 49 |  |  |  | 260 |  |  |  | 147 |
Amortization of prior service credit |  |  | (48 | ) |  |  | (93 | ) |  |  | (143 | ) |  |  | (280 | )
Net actuarial loss |  |  | — |  |  |  | — |  |  |  | 196 |  |  |  | 40 |
Special termination benefits |  |  | — |  |  |  | 601 |  |  |  | — |  |  |  | 3,419 |
Total net periodic postretirement benefit cost |  | $ | 49 |  |  | $ | 567 |  |  | $ | 344 |  |  | $ | 3,355 |

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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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