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Income Taxes (Details 2) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Deferred income tax assets: |  |
Self insurance reserves | $ 8,369 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance | $ 8,643 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsSelfInsurance
Contract loss reserves | 72 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves | 435 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves
Stock-based awards | 4,420 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 4,245 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Bonus | 2,578 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBonuses | 2,884 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBonuses
Other | 886 us-gaap_DeferredTaxAssetsOther | 2,588 us-gaap_DeferredTaxAssetsOther
Total deferred income tax assets | 16,325 us-gaap_DeferredTaxAssetsNet | 18,795 us-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 | 11,905 us-gaap_DeferredTaxAssetsNetCurrent | 14,550 us-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

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from estimated losses under self insurance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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