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Pension Benefits (Tables)
 3 Months Ended
Mar. 27, 2016
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost
The components of net periodic benefit cost for the three months ended March 27, 2016 and March 29, 2015 were as follows:
 
Quarter
 
(13 weeks) Ended
(amounts in thousands)
March 27,
2016

 
March 29,
2015

Service cost
$
269

 
$
304

Interest cost
577

 
535

Expected return on plan assets
(25
)
 
(34
)
Amortization of actuarial loss
439

 
750

Amortization of prior service costs
10

 
6

Net periodic pension cost
$
1,270

 
$
1,561