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Post-retirement Benefits Other Than Pension (Tables) | 6 Months Ended
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Jun. 28, 2015
Post-retirement benefits other than pension |
Defined Benefit Plan Disclosure [Line Items] |
Postretirement benefit costs for health care and life insurance | Post-retirement benefit costs for health care and life insurance are presented in the following table:
In thousands | Thirteen Weeks Ended |  | Twenty-six Weeks Ended
| Jun. 28, 2015 |  | Jun. 29, 2014 |  | Jun. 28, 2015 |  | Jun. 29, 2014
Service cost-benefits earned during the period | $ | 106 |  |  | $ | 68 |  |  | $ | 212 |  |  | $ | 186 |
Interest cost on net benefit obligation | 993 |  |  | 1,030 |  |  | 1,986 |  |  | 2,515 |
Amortization of prior service credit | (2,500 | ) |  | (3,116 | ) |  | (5,000 | ) |  | (5,483 | )
Amortization of actuarial loss | 400 |  |  | 124 |  |  | 800 |  |  | 332 |
Net periodic post-retirement benefit credit | $ | (1,001 | ) |  | $ | (1,894 | ) |  | $ | (2,002 | ) |  | $ | (2,450 | )

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=58242635&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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