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Employee Benefit Plans (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Defined Benefit Plan, Contributions by Employer $ 0us-gaap_DefinedBenefitPlanContributionsByEmployer
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year $ 3.7us-gaap_DefinedBenefitPlansEstimatedFutureEmployerContributionsInCurrentFiscalYear