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Post-retirement Benefits Other Than Pension (Tables)
 6 Months Ended
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
)