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Pension Plans (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 28, 2012
Sep. 30, 2011
Sep. 28, 2012
Sep. 30, 2011
Service cost $ 122 $ 161 $ 364 $ 423
Interest cost 34 42 102 104
Expected return on plan assets (28) (34) (81) (83)
Amortization of unrecognized transitional obligation 4 4 12 12
Amortization of prior service cost 0 (1) (1) (1)
Recognized actuarial gain (1) (2) (4) (18)
Defined Benefit Plan, Net Periodic Benefit Cost $ 131 $ 170 $ 392 $ 437