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Pension Plans (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Apr. 03, 2015
Apr. 04, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Service cost $ 107us-gaap_DefinedBenefitPlanServiceCost $ 116us-gaap_DefinedBenefitPlanServiceCost
Interest cost 19us-gaap_DefinedBenefitPlanInterestCost 35us-gaap_DefinedBenefitPlanInterestCost
Expected return on plan assets (21)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets (27)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
Net amortization of transitional obligation (a) 3us-gaap_DefinedBenefitPlanAmortizationOfTransitionObligationsAssets [1] 0us-gaap_DefinedBenefitPlanAmortizationOfTransitionObligationsAssets [1]
Actuarial loss, recognized in current period (a) 12us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses [1] 6us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses [1]
Net periodic pension cost $ 120us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost $ 130us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
[1] Amounts reclassified from accumulated other comprehensive income.