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Employee Benefit Plans (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Oct. 02, 2011
Sep. 30, 2012
Oct. 02, 2011
Summary of Pension (benefit) expense        
Service cost $ (2) $ 9 $ 18 $ 27
Interest cost on projected benefit obligation 472 517 1,404 1,551
Net amortizations, deferrals and other costs 229 146 631 439
Expected return on plan assets (607) (638) (1,823) (1,915)
Total $ 92 $ 34 $ 230 $ 102