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Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current:      
Federal $ (2,273,000)us-gaap_CurrentFederalTaxExpenseBenefit $ (1,869,000)us-gaap_CurrentFederalTaxExpenseBenefit $ (136,000)us-gaap_CurrentFederalTaxExpenseBenefit
State (744,000)us-gaap_CurrentStateAndLocalTaxExpenseBenefit (892,000)us-gaap_CurrentStateAndLocalTaxExpenseBenefit (866,000)us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total (3,017,000)us-gaap_CurrentIncomeTaxExpenseBenefit (2,761,000)us-gaap_CurrentIncomeTaxExpenseBenefit (1,002,000)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:      
Federal 703,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit 773,000us-gaap_DeferredFederalIncomeTaxExpenseBenefit (2,520,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State 178,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 63,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 31,000us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Total 881,000us-gaap_DeferredIncomeTaxExpenseBenefit 836,000us-gaap_DeferredIncomeTaxExpenseBenefit (2,489,000)us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense (2,136,000)us-gaap_IncomeTaxExpenseBenefit (1,925,000)us-gaap_IncomeTaxExpenseBenefit (3,491,000)us-gaap_IncomeTaxExpenseBenefit
Reconciliation of the effective income tax rate with the applicable statutory federal income tax rate      
Federal tax at statutory rate (as a percent) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State taxes, net of federal benefit (as a percent) 6.10%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 13.40%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 6.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Valuation allowance (as a percent) 0.90%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (0.40%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Non-deductible stock based compensation (as a percent)   1.60%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost 1.60%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
Other (as a percent) (1.60%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (1.40%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate (as a percent) 40.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations 48.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations 43.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Deferred income tax assets:      
Accruals not currently deductible for income taxes 2,985,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 1,846,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals  
Net operating loss carry-forwards 10,948,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 11,070,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Total deferred income tax assets 13,933,000us-gaap_DeferredTaxAssetsGross 12,916,000us-gaap_DeferredTaxAssetsGross  
Valuation allowance (10,404,000)us-gaap_DeferredTaxAssetsValuationAllowance (10,360,000)us-gaap_DeferredTaxAssetsValuationAllowance  
Net deferred income tax assets 3,529,000us-gaap_DeferredTaxAssetsNet 2,556,000us-gaap_DeferredTaxAssetsNet  
Deferred income tax liabilities:      
Depreciation (18,033,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (19,070,000)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment  
Total deferred income tax liability (18,033,000)us-gaap_DeferredIncomeTaxLiabilities (19,070,000)us-gaap_DeferredIncomeTaxLiabilities  
Net deferred income tax liability (14,504,000)us-gaap_DeferredTaxAssetsLiabilitiesNet (16,514,000)us-gaap_DeferredTaxAssetsLiabilitiesNet  
Amounts recognized in the consolidated balance sheets:      
Current deferred income tax assets 79,000us-gaap_DeferredTaxAssetsNetCurrent 76,000us-gaap_DeferredTaxAssetsNetCurrent  
Noncurrent deferred income tax assets 580,000us-gaap_DeferredTaxAssetsNetNoncurrent 336,000us-gaap_DeferredTaxAssetsNetNoncurrent  
Noncurrent deferred income tax liabilities (15,163,000)us-gaap_DeferredTaxLiabilitiesNoncurrent (16,926,000)us-gaap_DeferredTaxLiabilitiesNoncurrent  
Net deferred income tax liability $ (14,504,000)us-gaap_DeferredTaxLiabilities $ (16,514,000)us-gaap_DeferredTaxLiabilities