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Income Taxes - Income Tax Expense (Benefit) Related to Other Comprensive Income (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 28, 2015
Mar. 29, 2014
Income Tax Disclosure [Abstract]    
Income tax benefit related to foreign currency translation adjustment $ 0us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax $ (105)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax
Income tax expense related to change in unrecognized pension gains, losses and prior service costs 217us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax 124us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
Income tax expense related to items of other comprehensive income $ 217us-gaap_OtherComprehensiveIncomeLossTax $ 19us-gaap_OtherComprehensiveIncomeLossTax