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Pension and other postretirement benefits | 9 Months Ended
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Sep. 30, 2018
Retirement Benefits [Abstract] |
Pension and other postretirement benefits | 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 September 30, 2018, 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 Nine Months Ended |  | Other Postretirement Benefits Nine Months Ended
| September 30, 2018 |  | October 1, 2017 |  | September 30, 2018 |  | October 1, 2017 |  | September 30, 2018 |  | October 1, 2017 |  | September 30, 2018 |  | October 1, 2017
| (Dollars in thousands)
Service cost | $ | 380 |  |  | $ | 725 |  |  | $ | (66 | ) |  | $ | 61 |  |  | $ | 1,135 |  |  | $ | 2,162 |  |  | $ | 38 |  |  | $ | 210 |
Interest cost | 3,681 |  |  | 3,773 |  |  | 285 |  |  | 426 |  |  | 11,119 |  |  | 11,347 |  |  | 1,042 |  |  | 1,183 |
Expected return on plan assets | (7,423 | ) |  | (6,607 | ) |  | — |  |  | — |  |  | (22,260 | ) |  | (20,100 | ) |  | — |  |  | — |
Net amortization and deferral | 1,687 |  |  | 1,668 |  |  | (23 | ) |  | 75 |  |  | 5,090 |  |  | 5,049 |  |  | 101 |  |  | 206 |
Net benefits expense (income) | $ | (1,675 | ) |  | $ | (441 | ) |  | $ | 196 |  |  | $ | 562 |  |  | $ | (4,916 | ) |  | $ | (1,542 | ) |  | $ | 1,181 |  |  | $ | 1,599 |

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- References No definition available. + Details
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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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