Annual report pursuant to Section 13 and 15(d)

Income Taxes (Schedule Of Effective Reconciliation Of The U.S. Statutory Federal Income Tax Rates) (Details)

v2.4.1.9
Income Taxes (Schedule Of Effective Reconciliation Of The U.S. Statutory Federal Income Tax Rates) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Tax provision at statutory rate on income before income taxes $ 151,380us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 115,040us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 95,584us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit 14,120us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 12,083us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 10,211us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Meals and entertainment disallowance 959us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment 872us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment 828us-gaap_IncomeTaxReconciliationNondeductibleExpenseMealsAndEntertainment
Tax credits (1,307)us-gaap_IncomeTaxReconciliationTaxCredits (5,422)us-gaap_IncomeTaxReconciliationTaxCredits (2,609)us-gaap_IncomeTaxReconciliationTaxCredits
Other, net (152)us-gaap_IncomeTaxReconciliationOtherReconcilingItems 0us-gaap_IncomeTaxReconciliationOtherReconcilingItems (368)us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Total provision for income taxes $ 165,000us-gaap_IncomeTaxExpenseBenefit $ 122,573us-gaap_IncomeTaxExpenseBenefit $ 103,646us-gaap_IncomeTaxExpenseBenefit