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Pension Plans (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 29, 2012
Jul. 01, 2011
Jun. 29, 2012
Jul. 01, 2011
Service cost $ 121 $ 122 $ 242 $ 262
Interest cost 34 28 67 62
Expected return on plan assets (27) (23) (53) (49)
Amortization of unrecognized transitional obligation 4 4 8 8
Amortization of prior service cost (1) (1) (1) (1)
Recognized actuarial gain (1) (9) (2) (15)
Defined Benefit Plan, Net Periodic Benefit Cost $ 130 $ 121 $ 261 $ 267