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Pension and other postretirement benefits (Tables) | 9 Months Ended
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Sep. 30, 2018
Retirement Benefits [Abstract] |
Schedule of Net Benefit Cost of Pension and Postretirement Benefit Plans | 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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- 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=108410482&loc=d3e1928-114920 + Details
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