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Income Taxes (Details3) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred income tax assets-    
Accounts receivable and allowance for doubtful accounts $ 1,626us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts $ 1,660us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Stock compensation 2,793us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 2,165us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Accrued liabilities and expenses 18,670us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 19,290us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
State net operating loss carryforwards 6,958us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 6,107us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Other 761us-gaap_DeferredTaxAssetsOther 613us-gaap_DeferredTaxAssetsOther
Total deferred income tax assets 30,808us-gaap_DeferredTaxAssetsGross 29,835us-gaap_DeferredTaxAssetsGross
Deferred income tax liabilities-    
Property and equipment (7,035)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (6,660)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Long-term contracts (535)fix_DeferredTaxLiabilitiesLongTermContracts (671)fix_DeferredTaxLiabilitiesLongTermContracts
Goodwill (3,562)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill (3,364)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsGoodwill
Intangible assets (1,378)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (2,803)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Other (271)us-gaap_DeferredTaxLiabilitiesOther (947)us-gaap_DeferredTaxLiabilitiesOther
Total deferred income tax liabilities (12,781)us-gaap_DeferredIncomeTaxLiabilities (14,445)us-gaap_DeferredIncomeTaxLiabilities
Less-Valuation allowance (3,975)us-gaap_DeferredTaxAssetsValuationAllowance (5,918)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred income tax assets 14,052us-gaap_DeferredTaxAssetsNet 9,472us-gaap_DeferredTaxAssetsNet
Deferred income tax assets-    
Prepaid expenses and other 19,423us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 18,279us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Other noncurrent assets 5,747us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 1,472us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Total deferred income tax assets 25,170us-gaap_DeferredTaxAssetsLiabilitiesNet 19,751us-gaap_DeferredTaxAssetsLiabilitiesNet
Deferred income tax liabilities-    
Other current liabilities 301us-gaap_DeferredTaxLiabilitiesCurrent 338us-gaap_DeferredTaxLiabilitiesCurrent
Deferred income tax liabilities 10,817us-gaap_DeferredTaxLiabilitiesNoncurrent 9,941us-gaap_DeferredTaxLiabilitiesNoncurrent
Total deferred income tax liabilities $ 11,118us-gaap_DeferredTaxLiabilities $ 10,279us-gaap_DeferredTaxLiabilities