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Employee Benefit Plans (Amounts Recognized in Accumulated Other Comprehensive Income, Not Yet Recognized as a Component of Net Periodic Benefit Cost) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 25, 2013
Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Unamortized actuarial losses, net $ (27,574,000)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
$ (17,433,000)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Accumulated other comprehensive income to be recognized in 2015 1,700,000us-gaap_DefinedBenefitPlanAmountToBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossNextFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
 
Other Defined Benefit Plans [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Unamortized actuarial losses, net (1,081,000)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPensionPlansDefinedBenefitMember
(899,000)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPensionPlansDefinedBenefitMember
Other Defined Benefit Plans [Member] | Maximum [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Accumulated other comprehensive income to be recognized in 2015 $ 100,000us-gaap_DefinedBenefitPlanAmountToBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossNextFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPensionPlansDefinedBenefitMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember