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Employee Benefits (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Apr. 04, 2015
Apr. 05, 2014
Compensation and Retirement Disclosure [Abstract]    
Service cost $ 300us-gaap_DefinedBenefitPlanServiceCost $ 264us-gaap_DefinedBenefitPlanServiceCost
Interest cost on projected benefit obligation 1,250us-gaap_DefinedBenefitPlanInterestCost 1,280us-gaap_DefinedBenefitPlanInterestCost
Expected return on plan assets (1,523)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets (1,510)us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets
Amortization of unrecognized loss 211us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses 191us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses
Net periodic pension cost $ 238us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost $ 225us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost