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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
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Income Taxes [Abstract] |  |
Carrying value of inventories | $ 4,772 us-gaap_DeferredTaxAssetsInventory | $ 6,241 us-gaap_DeferredTaxAssetsInventory
Accrued liabilities and allowances deductible for tax purposes on a cash basis | 5,620 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities | 5,383 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Goodwill | 8,433 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets | 13,346 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Stock-based compensation | 6,583 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 7,169 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Net operating loss carryforwards | 40,217 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 40,915 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Tax credit carryforwards | 7,148 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards | 5,970 us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Other | 8,977 us-gaap_DeferredTaxAssetsOther | 7,394 us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets | 81,750 us-gaap_DeferredTaxAssetsGross | 86,418 us-gaap_DeferredTaxAssetsGross
Less: valuation allowance | (36,682)us-gaap_DeferredTaxAssetsValuationAllowance | (30,312)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets | 45,068 us-gaap_DeferredTaxAssetsNet | 56,106 us-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 | 31,413 us-gaap_DeferredTaxAssetsLiabilitiesNet | 43,087 us-gaap_DeferredTaxAssetsLiabilitiesNet
Current deferred tax assets | 8,502 us-gaap_DeferredTaxAssetsNetCurrent | 11,302 us-gaap_DeferredTaxAssetsNetCurrent
Non-current deferred tax assets | 25,017 us-gaap_DeferredTaxAssetsNetNoncurrent | 33,856 us-gaap_DeferredTaxAssetsNetNoncurrent
Non-current deferred tax liabilities | $ (2,106)us-gaap_DeferredTaxLiabilitiesNoncurrent | $ (2,071)us-gaap_DeferredTaxLiabilitiesNoncurrent

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