Quarterly report pursuant to Section 13 or 15(d)

Supplemental Retirement Plan and Related Post Retirement Benefits (Details)

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Supplemental Retirement Plan and Related Post Retirement Benefits (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 29, 2012
Oct. 01, 2011
Sep. 29, 2012
Oct. 01, 2011
Net periodic pension cost for defined benefit plans        
Service cost $ 88 $ 12 $ 215 $ 36
Interest cost 148 82 400 246
Amortization of prior service cost 122 27 304 81
Amortization of net actuarial gains 22 3 69 9
Net periodic cost $ 380 $ 124 $ 988 $ 372