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Employee Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jul. 01, 2012
Jul. 03, 2011
Jul. 01, 2012
Jul. 03, 2011
Summary of Pension (benefit) expense        
Service cost $ 10 $ 7 $ 20 $ 18
Interest cost on projected benefit obligation 466 455 932 1,034
Net amortizations, deferrals and other costs 201 154 402 293
Expected return on plan assets (608) (673) (1,216) (1,277)
Total $ 69 $ (57) $ 138 $ 68