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Post-retirement Benefits Other Than Pension (Tables)
 9 Months Ended
Sep. 27, 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
 
Thirty-nine Weeks Ended
 
Sept. 27, 2015
 
Sept. 28, 2014
 
Sept. 27, 2015
 
Sept. 28, 2014
 
 
 
 
 
 
 
 
Service cost (credit)-benefits earned during the period
$
(58
)
 
$
92

 
$
154

 
$
278

Interest cost on net benefit obligation
171

 
1,098

 
2,157

 
3,613

Amortization of prior service credit
(130
)
 
(3,083
)
 
(5,130
)
 
(8,566
)
Amortization of actuarial loss
90

 
213

 
890

 
545

Net periodic post-retirement benefit credit
$
73

 
$
(1,680
)
 
$
(1,929
)
 
$
(4,130
)