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Post-retirement Benefits Other Than Pension | 6 Months Ended
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Jun. 28, 2015
Post-retirement benefits other than pension |
Defined Benefit Plan Disclosure [Line Items] |
Post-retirement benefits other than pension | Post-retirement benefits other than pension We provide health care and life insurance benefits to certain retired employees who meet age and service requirements. Most of our retirees contribute to the cost of these benefits, and retiree contributions are increased as actual benefit costs increase. The cost of providing retiree health care and life insurance benefits is actuarially determined. Our policy is to fund benefits as claims and premiums are paid. In March 2014, we adopted changes to the retiree medical plan that were effective July 1, 2014. Beginning on that date, we pay a stipend to certain Medicare-eligible retirees. As a result of this change, we remeasured the related post-retirement benefit obligation during the first quarter of 2014, and recorded a reduction to the liability of $33.9 million (with a corresponding adjustment to “Accumulated other comprehensive loss”). 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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