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Income Taxes (Details 3)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of reconciliation between statutory tax rate and effective tax rate      
Statutory federal rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefits 4.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 4.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 4.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Other 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective tax rate 39.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations 39.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations 39.50%us-gaap_EffectiveIncomeTaxRateContinuingOperations