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Pension Benefits (Tables)
 9 Months Ended
Sep. 27, 2015
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost
The components of net periodic benefit cost for the three and nine months ended September 27, 2015 and September 28, 2014 were as follows:
 
Quarter
 
Nine months
 
(13 weeks) Ended
 
(39 weeks) Ended
(amounts in thousands)
September 27,
2015

 
September 28,
2014

 
September 27,
2015

 
September 28,
2014

Service cost
$
299

 
$
274

 
$
900

 
$
839

Interest cost
526

 
887

 
1,586

 
2,720

Expected return on plan assets
(34
)
 
—

 
(101
)
 
(1
)
Amortization of actuarial loss
737

 
373

 
2,220

 
1,144

Amortization of prior service costs
7

 
3

 
20

 
9

Net periodic pension cost
$
1,535

 
$
1,537

 
$
4,625

 
$
4,711