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Pension and Other Post-Retirement Benefit Plans Employee Benefits (Tables) | 9 Months Ended
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Sep. 26, 2015
Compensation and Retirement Disclosure [Abstract] |
Schedule of Net Benefit Costs | The following table provides the components of net periodic cost (benefit) for the Company’s pension and other post-retirement benefit plans for the three months ended September 26, 2015 and September 27, 2014:
| Pension Plans |  | Other Post-Retirement Benefit Plans
| September 26, 2015 |  | September 27, 2014 |  | September 26, 2015 |  | September 27, 2014
| (in thousands)
Service cost | $ | 935 |  |  | $ | 880 |  |  | $ | 214 |  |  | $ | 190 |
Interest cost | 3,070 |  |  | 3,211 |  |  | 265 |  |  | 252 |
Expected return on plan assets | (4,383 | ) |  | (4,540 | ) |  | — |  |  | — |
Amortization of prior service cost (credit) | (150 | ) |  | (166 | ) |  | — |  |  | 159 |
Amortization of net loss | 780 |  |  | 238 |  |  | 65 |  |  | 60 |
Net periodic cost (benefit) | $ | 252 |  |  | $ | (377 | ) |  | $ | 544 |  |  | $ | 661 |
The following table provides the components of net periodic cost (benefit) for the Company’s pension and other post-retirement benefit plans for the nine months ended September 26, 2015 and September 27, 2014:
| Pension Plans |  | Other Post-Retirement Benefit Plans
| September 26, 2015 |  | September 27, 2014 |  | September 26, 2015 |  | September 27, 2014
| (in thousands)
Service cost | $ | 2,806 |  |  | $ | 2,565 |  |  | $ | 642 |  |  | $ | 569 |
Interest cost | 9,210 |  |  | 9,633 |  |  | 796 |  |  | 757 |
Expected return on plan assets | (13,147 | ) |  | (13,095 | ) |  | — |  |  | — |
Amortization of prior service cost (credit) | (451 | ) |  | (484 | ) |  | — |  |  | 489 |
Amortization of net loss | 2,433 |  |  | 684 |  |  | 203 |  |  | 185 |
Net periodic cost (benefit) | $ | 851 |  |  | $ | (697 | ) |  | $ | 1,641 |  |  | $ | 2,000 |

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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=58740216&loc=d3e1928-114920 + Details
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