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Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred income tax assets:    
Self insurance reserves $ 8,369us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance $ 8,643us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance
Contract loss reserves 72us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves 435us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves
Stock-based awards 4,420us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 4,245us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Bonus 2,578us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBonuses 2,884us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBonuses
Other 886us-gaap_DeferredTaxAssetsOther 2,588us-gaap_DeferredTaxAssetsOther
Total deferred income tax assets 16,325us-gaap_DeferredTaxAssetsNet 18,795us-gaap_DeferredTaxAssetsNet
Deferred income tax liabilities:    
Property and equipment - tax over book depreciation (25,350)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (24,037)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Intangible assets - tax over book amortization (3,799)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (3,927)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Total deferred income tax liabilities (29,149)us-gaap_DeferredIncomeTaxLiabilities (27,964)us-gaap_DeferredIncomeTaxLiabilities
Net deferred income taxes (12,824)us-gaap_DeferredTaxLiabilities (9,169)us-gaap_DeferredTaxLiabilities
Balance sheet classification of deferred income taxes    
Current deferred income tax assets 11,905us-gaap_DeferredTaxAssetsNetCurrent 14,550us-gaap_DeferredTaxAssetsNetCurrent
Non-current deferred income tax liabilities (24,729)us-gaap_DeferredTaxLiabilitiesNoncurrent (23,719)us-gaap_DeferredTaxLiabilitiesNoncurrent
Net deferred income taxes $ (12,824)us-gaap_DeferredTaxLiabilities $ (9,169)us-gaap_DeferredTaxLiabilities