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Income Taxes Income Taxes (Details) - Net Deferred Tax Liabilities (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Deferred revenue $ 2,779us-gaap_DeferredTaxAssetsDeferredIncome $ 1,850us-gaap_DeferredTaxAssetsDeferredIncome
Reserves and other 2,319us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther 2,073us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
Stock-based compensation 5,963us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 5,200us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Total deferred tax assets 11,061us-gaap_DeferredTaxAssetsGross 9,123us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:    
Depreciation and amortization (6,568)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets (16,960)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets
Deferred Tax Assets, Net $ 4,493us-gaap_DeferredTaxAssetsLiabilitiesNet $ (7,837)us-gaap_DeferredTaxAssetsLiabilitiesNet