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Employee Benefit Plans (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Employee Benefit Plans [Line Items]      
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation $ 135,850,000us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation $ 107,722,000us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation  
Defined Benefit Plan, Amortization of Net Gains (Losses) 3,800,000us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss    
Defined Benefit Plan, Amortization of Net Prior Service Cost (Credit) 2,200,000us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit    
Defined Contribution Plan, Cost Recognized 7,800,000us-gaap_DefinedContributionPlanCostRecognized 7,300,000us-gaap_DefinedContributionPlanCostRecognized 6,400,000us-gaap_DefinedContributionPlanCostRecognized
Pension Plans, Defined Benefit [Member]      
Employee Benefit Plans [Line Items]      
Defined Benefit Plan, Net Periodic Benefit Cost 10,710,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		 12,004,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		 13,193,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year 13,100,000us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_PensionPlansDefinedBenefitMember		    
Other Postretirement Benefit Plans, Defined Benefit [Member]      
Employee Benefit Plans [Line Items]      
Defined Benefit Plan, Net Periodic Benefit Cost 5,376,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember		 4,102,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember		 3,630,000us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year $ 4,300,000us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInNextFiscalYear
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember		    
Equity Securities [Member]      
Employee Benefit Plans [Line Items]      
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities 60.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_EquitySecuritiesMember		    
Debt Securities [Member]      
Employee Benefit Plans [Line Items]      
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities 40.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= us-gaap_DebtSecuritiesMember