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Income Taxes (Schedule Of Differences Between The Income Tax Expense (Benefit)Computed At The Statutory Federal income Tax Rate And As Presented On The Consolidated Statements Of Operations) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended 36 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Income Taxes [Abstract]                        
Federal statutory rate                       35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Tax expense at federal statutory rate of 35%                 $ 87,650us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 25,299us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 8,810us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate  
State income tax expense, net of federal benefit                 6,810us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 2,002us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 4,036us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes  
Qualified production activities deduction                 (4,637)us-gaap_IncomeTaxReconciliationDeductionsQualifiedProductionActivities      
Increase (decrease) in valuation allowance against deferred tax assets                   (709)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance    
Nondeductible compensation                 848us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost 1,491us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost    
Other                 255us-gaap_IncomeTaxReconciliationOtherReconcilingItems 807us-gaap_IncomeTaxReconciliationOtherReconcilingItems 547us-gaap_IncomeTaxReconciliationOtherReconcilingItems  
Income tax expense $ 22,377us-gaap_IncomeTaxExpenseBenefit $ 24,250us-gaap_IncomeTaxExpenseBenefit $ 17,775us-gaap_IncomeTaxExpenseBenefit $ 26,525us-gaap_IncomeTaxExpenseBenefit $ 15,371us-gaap_IncomeTaxExpenseBenefit $ 7,633us-gaap_IncomeTaxExpenseBenefit $ 4,288us-gaap_IncomeTaxExpenseBenefit $ 1,598us-gaap_IncomeTaxExpenseBenefit $ 90,926us-gaap_IncomeTaxExpenseBenefit $ 28,890us-gaap_IncomeTaxExpenseBenefit $ 13,393us-gaap_IncomeTaxExpenseBenefit