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Pension and other postretirement benefits | 6 Months Ended
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Jul. 02, 2017
Compensation and Retirement Disclosure [Abstract] |
Pension and other postretirement benefits | Note 12 — Pension and other postretirement benefits The Company has a number of defined benefit pension and postretirement plans covering eligible U.S. and non-U.S. employees. As of July 2, 2017, no further benefits are being accrued under the Company’s U.S. defined benefit pension plans and the Company’s other postretirement benefit plans, other than certain postretirement benefit plans covering employees subject to a collective bargaining agreement. Net pension and other postretirement benefits expense (income) consist of the following:
| Pension Three Months Ended |  | Other Postretirement Benefits Three Months Ended |  | Pension Six Months Ended |  | Other Postretirement Benefits Six Months Ended
| July 2, 2017 |  | June 26, 2016 |  | July 2, 2017 |  | June 26, 2016 |  | July 2, 2017 |  | June 26, 2016 |  | July 2, 2017 |  | June 26, 2016
| (Dollars in thousands)
Service cost | $ | 720 |  |  | $ | 655 |  |  | $ | 75 |  |  | $ | 111 |  |  | $ | 1,437 |  |  | $ | 1,307 |  |  | $ | 149 |  |  | $ | 222 |
Interest cost | 3,789 |  |  | 3,929 |  |  | 379 |  |  | 407 |  |  | 7,574 |  |  | 7,849 |  |  | 757 |  |  | 813 |
Expected return on plan assets | (6,750 | ) |  | (6,199 | ) |  | — |  |  | — |  |  | (13,493 | ) |  | (12,397 | ) |  | — |  |  | — |
Net amortization and deferral | 1,691 |  |  | 1,577 |  |  | 66 |  |  | 57 |  |  | 3,381 |  |  | 3,156 |  |  | 131 |  |  | 114 |
Net benefits expense (income) | $ | (550 | ) |  | $ | (38 | ) |  | $ | 520 |  |  | $ | 575 |  |  | $ | (1,101 | ) |  | $ | (85 | ) |  | $ | 1,037 |  |  | $ | 1,149 |

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