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Retirement Plans (Tables)
3 Months Ended
Mar. 27, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
he following table summarizes the components of net periodic pension cost for the first quarter of 2016 and 2015.
(Dollars in thousands)
Thirteen Weeks Ended
 
March 27, 2016
 
March 29, 2015
Service cost
$

 
$
11

Interest cost
304

 
307

Net amortization
84

 
134

Net periodic pension cost
$
388

 
$
452