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
Mar. 30, 2013
Mar. 31, 2012
Net periodic pension cost/net periodic cost recognized for defined benefit plans    
Service cost $ 74 $ 41
Interest cost 155 104
Amortization of prior service cost 124 59
Amortization of net actuarial losses 32 23
Net periodic cost $ 385 $ 227