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Income Taxes (Schedule Of Effective Tax Rate) (Details)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Taxes [Abstract]      
Statutory U.S. federal income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income tax, net of related federal income tax benefit 3.70%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 4.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 4.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Other (1.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.50%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rates 37.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations 38.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations 39.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations