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 6 Months Ended
Jun. 30, 2012
Jul. 02, 2011
Jun. 30, 2012
Jul. 02, 2011
Net periodic pension cost for defined benefit plans        
Service cost $ 88 $ 12 $ 128 $ 24
Interest cost 147 82 252 164
Amortization of prior service cost 122 27 181 54
Amortization of net actuarial losses 23 3 46 6
Net periodic cost $ 380 $ 124 $ 607 $ 248