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Defined Benefit Plans (Defined Benefit Plan Costs) (Details 3) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 29, 2013
Mar. 30, 2012
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]    
Defined Benefit Plan, Service Cost $ 82 $ 285
Defined Benefit Plan, Interest Cost 63 104
Net Gain Loss Due To Curtailments (1,150) 0
Defined Benefit Plan, Amortization of (Gains) Losses 0 31
Defined Benefit Plan, Expected Return on Plan Assets 0 (108)
Defined Benefit Plan, Net Periodic Benefit Cost $ (1,005) $ 312