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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax liabilities:    
Property and equipment $ 7,727us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment $ 8,235us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Intangible assets 18,134us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets 14,425us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Prepaid expenses 621us-gaap_DeferredTaxLiabilitiesPrepaidExpenses 601us-gaap_DeferredTaxLiabilitiesPrepaidExpenses
Total deferred tax liabilities 26,482us-gaap_DeferredIncomeTaxLiabilities 23,261us-gaap_DeferredIncomeTaxLiabilities
Deferred tax assets:    
Allowance for doubtful accounts 158us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 232us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Compensation 3,264us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 3,355us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Other accrued liabilities 119us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 128us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Loss carry forwards 0us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 7us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred Tax Assets, Gross, Total 3,541us-gaap_DeferredTaxAssetsGross 3,722us-gaap_DeferredTaxAssetsGross
Less: valuation allowance 0us-gaap_DeferredTaxAssetsValuationAllowance 7us-gaap_DeferredTaxAssetsValuationAllowance
Total net deferred tax asset 3,541us-gaap_DeferredTaxAssetsNet 3,715us-gaap_DeferredTaxAssetsNet
Net deferred tax liabilities 22,941us-gaap_DeferredTaxLiabilities 19,546us-gaap_DeferredTaxLiabilities
Current portion of deferred tax assets 845us-gaap_DeferredTaxAssetsValuationAllowanceCurrent 1,025us-gaap_DeferredTaxAssetsValuationAllowanceCurrent
Non-current portion of deferred tax liabilities (23,786)us-gaap_DeferredTaxLiabilitiesNoncurrent (20,571)us-gaap_DeferredTaxLiabilitiesNoncurrent
Net deferred tax liabilities $ (22,941)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (19,546)us-gaap_DeferredTaxAssetsLiabilitiesNet