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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Income Taxes [Abstract] |  |
Carrying value of inventories | $ 2,474 | $ 2,400
Accrued liabilities and allowances deductible for tax purposes on a cash basis | 6,387 | 5,663
Goodwill | 2,732 | 4,814
Stock-based compensation | 2,359 | 3,856
Net operating loss carryforwards | 22,096 | 38,988
Tax credit carryforwards | 2,007 | 8,688
Other | 5,924 | 6,812
Gross deferred tax assets | 43,979 | 71,221
Less: valuation allowance | (15,823) | (16,026)
Net deferred tax assets | 28,156 | 55,195
Plant and equipment, due to differences in depreciation | (8,543) | (11,499)
Intangible assets, due to differences in amortization | (20,891) | (35,492)
Other | (1,715) | (1,632)
Gross deferred tax liability | (31,149) | (48,623)
Net deferred tax asset (liability) | (2,993) |
Net deferred tax asset (liability) |  | 6,572
Non-current deferred tax assets | 4,034 | 6,572
Long-term liability | (7,027) | 0
Total | $ 2,993 |
Total |  | $ 6,572

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