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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income Taxes [Abstract]    
Carrying value of inventories $ 4,772us-gaap_DeferredTaxAssetsInventory $ 6,241us-gaap_DeferredTaxAssetsInventory
Accrued liabilities and allowances deductible for tax purposes on a cash basis 5,620us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 5,383us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Goodwill 8,433us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 13,346us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Stock-based compensation 6,583us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 7,169us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Net operating loss carryforwards 40,217us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 40,915us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Tax credit carryforwards 7,148us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 5,970us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Other 8,977us-gaap_DeferredTaxAssetsOther 7,394us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets 81,750us-gaap_DeferredTaxAssetsGross 86,418us-gaap_DeferredTaxAssetsGross
Less: valuation allowance (36,682)us-gaap_DeferredTaxAssetsValuationAllowance (30,312)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets 45,068us-gaap_DeferredTaxAssetsNet 56,106us-gaap_DeferredTaxAssetsNet
Plant and equipment, due to differences in depreciation (5,402)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (5,063)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Intangible assets, due to differences in amortization (6,102)us-gaap_DeferredTaxLiabilitiesOtherFiniteLivedAssets (6,117)us-gaap_DeferredTaxLiabilitiesOtherFiniteLivedAssets
Other (2,151)us-gaap_DeferredTaxLiabilitiesOther (1,839)us-gaap_DeferredTaxLiabilitiesOther
Gross deferred tax liability (13,655)us-gaap_DeferredTaxLiabilities (13,019)us-gaap_DeferredTaxLiabilities
Net deferred tax assets 31,413us-gaap_DeferredTaxAssetsLiabilitiesNet 43,087us-gaap_DeferredTaxAssetsLiabilitiesNet
Current deferred tax assets 8,502us-gaap_DeferredTaxAssetsNetCurrent 11,302us-gaap_DeferredTaxAssetsNetCurrent
Non-current deferred tax assets 25,017us-gaap_DeferredTaxAssetsNetNoncurrent 33,856us-gaap_DeferredTaxAssetsNetNoncurrent
Non-current deferred tax liabilities $ (2,106)us-gaap_DeferredTaxLiabilitiesNoncurrent $ (2,071)us-gaap_DeferredTaxLiabilitiesNoncurrent