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Income Taxes (Difference In Income Tax Expense And Expected Expense) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Federal income tax expense at the 'expected' rate of 35% $ 275,602us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 249,714us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 235,954us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit 20,549us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 16,683us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 20,449us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Other, net (2,867)us-gaap_IncomeTaxReconciliationOtherAdjustments (1,565)us-gaap_IncomeTaxReconciliationOtherAdjustments (2,784)us-gaap_IncomeTaxReconciliationOtherAdjustments
Total income tax expense $ 293,284us-gaap_IncomeTaxExpenseBenefit $ 264,832us-gaap_IncomeTaxExpenseBenefit $ 253,619us-gaap_IncomeTaxExpenseBenefit
Expected rate of federal income tax expense 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Effective income tax rate 37.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations 37.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations 37.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations