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Pension Benefits (Tables)
 6 Months Ended
Jun. 26, 2011
Pension Benefits  
Components of Net Periodic Benefit Cost
(amounts in thousands)
Quarter
(13 weeks) Ended
  
Six Months
(26 weeks) Ended
 
June 26,
2011
June 27,
2010
  
June 26,
2011
June 27,
2010
Service cost
$    252
$    206
  
$489
$    429
Interest cost
1,140
1,043
  
2,221
2,175
Expected return on plan assets
40
(14)
  
78
(30)
Amortization of actuarial (gain)
13
(6)
  
25
(12)
Amortization of transition obligation
33
30
  
65
62
Amortization of prior service costs
—
—
  
1
1
Net periodic pension cost
$ 1,478
$ 1,259
  
$ 2,879
$ 2,625