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Income Taxes (Reconciliation of the Provision for Income Taxes to the Amounts Computed at the Federal Statutory Rate) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Deferred Income Taxes and Tax Credits [Abstract]      
Federal, current $ 399,271us-gaap_CurrentFederalTaxExpenseBenefit $ 348,303us-gaap_CurrentFederalTaxExpenseBenefit $ 311,631us-gaap_CurrentFederalTaxExpenseBenefit
Federal, deferred 5,987us-gaap_DeferredFederalIncomeTaxExpenseBenefit 847us-gaap_DeferredFederalIncomeTaxExpenseBenefit 10,030us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Federal, total 405,258us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations 349,150us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations 321,661us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
State, current 43,242us-gaap_CurrentStateAndLocalTaxExpenseBenefit 38,428us-gaap_CurrentStateAndLocalTaxExpenseBenefit 35,982us-gaap_CurrentStateAndLocalTaxExpenseBenefit
State, deferred (4,500)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 1,072us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (1,868)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
State, total 38,742us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations 39,500us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations 34,114us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Current income tax expense (benefit) 442,513us-gaap_CurrentIncomeTaxExpenseBenefit 386,731us-gaap_CurrentIncomeTaxExpenseBenefit 347,613us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax expense (benefit) 1,487us-gaap_DeferredIncomeTaxExpenseBenefit 1,919us-gaap_DeferredIncomeTaxExpenseBenefit 8,162us-gaap_DeferredIncomeTaxExpenseBenefit
Provision for income taxes $ 444,000us-gaap_IncomeTaxExpenseBenefit $ 388,650us-gaap_IncomeTaxExpenseBenefit $ 355,775us-gaap_IncomeTaxExpenseBenefit