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Employee Benefit Plans (Schedule of Projected Benefit Obligations in Excess of Fair Value of Plan Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]      
Defined Benefit Plan, Benefit Obligation $ 138,196us-gaap_DefinedBenefitPlanBenefitObligation $ 111,195us-gaap_DefinedBenefitPlanBenefitObligation $ 112,759us-gaap_DefinedBenefitPlanBenefitObligation
Defined Benefit Plan, Fair Value of Plan Assets $ 66,757us-gaap_DefinedBenefitPlanFairValueOfPlanAssets $ 59,559us-gaap_DefinedBenefitPlanFairValueOfPlanAssets