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Pension and Other Postretirement Obligations (Tables) | 9 Months Ended
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Sep. 30, 2018
Retirement Benefits [Abstract] |
Components of Net Periodic Benefit Costs | The following table provides the components of net periodic benefit costs for our pension and other postretirement benefit plans:
|  | Pension Obligations |  | Other Postretirement Obligations
Three Months Ended |  | September 30, 2018 |  | October 1, 2017 |  | September 30, 2018 |  | October 1, 2017
|  | (In thousands)
Service cost |  | $ | 1,717 |  |  | $ | 1,206 |  |  | $ | 14 |  |  | $ | 14 |
Interest cost |  | 2,011 |  |  | 1,822 |  |  | 257 |  |  | 344 |
Expected return on plan assets |  | (4,660 | ) |  | (2,487 | ) |  | — |  |  | — |
Amortization of prior service credit |  | (37 | ) |  | (10 | ) |  | — |  |  | — |
Actuarial losses |  | 1,073 |  |  | 633 |  |  | — |  |  | 23 |
Net periodic cost |  | $ | 104 |  |  | $ | 1,164 |  |  | $ | 271 |  |  | $ | 381 |
Nine Months Ended |  |  |  |  |  |  |  |
Service cost |  | $ | 3,792 |  |  | $ | 3,549 |  |  | $ | 40 |  |  | $ | 41 |
Interest cost |  | 5,792 |  |  | 5,391 |  |  | 781 |  |  | 1,000 |
Expected return on plan assets |  | (9,688 | ) |  | (7,415 | ) |  | — |  |  | — |
Amortization of prior service credit |  | (59 | ) |  | (30 | ) |  | — |  |  | — |
Actuarial losses |  | 2,350 |  |  | 1,866 |  |  | — |  |  | 68 |
Net periodic cost |  | $ | 2,187 |  |  | $ | 3,361 |  |  | $ | 821 |  |  | $ | 1,109 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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