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Retirement Plans (Tables) | 9 Months Ended
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Sep. 29, 2013
Defined Benefit Pension Plans |
Net Periodic Pension (Benefit) Cost | Net periodic pension cost was comprised of the following:
|  | For the Three Months Ended |  |  | For the Nine Months Ended |
|  | September 29, 2013 |  |  | September 30, 2012 |  |  | September 29, 2013 |  |  | September 30, 2012 |
|  | (in thousands) |
Service cost |  | $ | 871 |  |  | $ | 685 |  |  | $ | 2,557 |  |  | $ | 2,054 |
Interest cost |  |  | 3,350 |  |  |  | 4,111 |  |  |  | 10,001 |  |  |  | 12,333 |
Expected return on plan assets |  |  | (3,664 | ) |  |  | (4,090 | ) |  |  | (10,925 | ) |  |  | (12,269 | )
Amortization of unrecognized prior service cost |  |  | 41 |  |  |  | 58 |  |  |  | 123 |  |  |  | 174 |
Actuarial loss (gain) |  |  | — |  |  |  | 1,937 |  |  |  | (1,122 | ) |  |  | 5,083 |
Total net periodic pension cost |  | $ | 598 |  |  | $ | 2,701 |  |  | $ | 634 |  |  | $ | 7,375 |
Post-Retirement Benefit Plans |
Net Periodic Pension (Benefit) Cost | Net periodic postretirement benefit was comprised of the following:
|  | For the Three Months Ended |  |  | For the Nine Months Ended |
|  | September 29, 2013 |  |  | September 30, 2012 |  |  | September 29, 2013 |  |  | September 30, 2012 |
|  | (in thousands) |
Service cost |  | $ | 19 |  |  | $ | 17 |  |  | $ | 56 |  |  | $ | 50 |
Interest cost |  |  | 86 |  |  |  | 109 |  |  |  | 257 |  |  |  | 328 |
Amortization of unrecognized prior service benefit |  |  | (150 | ) |  |  | (150 | ) |  |  | (449 | ) |  |  | (449 | )
Actuarial gain |  |  | — |  |  |  | — |  |  |  | (236 | ) |  |  | (92 | )
Total net periodic post-retirement benefit |  | $ | (45 | ) |  | $ | (24 | ) |  | $ | (372 | ) |  | $ | (163 | )

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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=28361610&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration