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Pension and Postretirement Benefits (Tables) | 9 Months Ended
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Sep. 25, 2016
Pension and Postretirement Benefits (Thousands of Dollars) [Abstract] |
Components of net periodic cost |
| Quarter Ended
| Pension |  | Postretirement
| September 25, |  | September 27, |  | September 25, |  | September 27,
| 2016 |  | 2015 |  | 2016 |  | 2015
Service cost | $ | 1,002 |  |  | 1,006 |  |  | 132 |  |  | 150
Interest cost |  | 4,611 |  |  | 4,603 |  |  | 294 |  |  | 285
Expected return on assets |  | (5,512) |  |  | (5,476) |  |  | - |  |  | -
Net amortization and deferrals |  | 2,134 |  |  | 2,202 |  |  | - |  |  | (114)
Curtailment |  | - |  |  | 643 |  |  | - |  |  | (3,842)
Net periodic benefit cost | $ | 2,235 |  |  | 2,978 |  |  | 426 |  |  | (3,521)
| Nine Months Ended
| Pension |  | Postretirement
| September 25, |  | September 27, |  | September 25, |  | September 27,
| 2016 |  | 2015 |  | 2016 |  | 2015
Service cost | $ | 2,995 |  |  | 3,038 |  |  | 397 |  |  | 450
Interest cost |  | 13,821 |  |  | 13,827 |  |  | 881 |  |  | 855
Expected return on assets |  | (16,523) |  |  | (16,452) |  |  | - |  |  | -
Net amortization and deferrals |  | 6,398 |  |  | 6,610 |  |  | - |  |  | (341)
Curtailment |  | - |  |  | 781 |  |  | - |  |  | (3,842)
Net periodic benefit cost | $ | 6,691 |  |  | 7,804 |  |  | 1,278 |  |  | (2,878)

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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=65897934&loc=d3e1928-114920 + Details
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