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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Income Taxes [Abstract] |  |
Carrying value of inventories | $ 3,212 | $ 2,787
Accrued liabilities and allowances deductible for tax purposes on a cash basis | 8,945 | 6,108
Goodwill | 1,976 | 2,351
Stock-based compensation | 2,500 | 2,347
Operating right-of-use lease liabilities | 19,087 | 0
Net operating loss carryforwards | 19,493 | 20,028
Tax credit carryforwards | 2,421 | 1,923
Other | 5,148 | 4,373
Gross deferred tax assets | 62,782 | 39,917
Less: valuation allowance | (15,992) | (13,709)
Net deferred tax assets | 46,790 | 26,208
Plant and equipment, due to differences in depreciation | (10,428) | (7,617)
Operating right-of-use lease assets | (18,826) | 0
Intangible assets, due to differences in amortization | (16,302) | (18,593)
Foreign withholding tax | (7,181) | (9,212)
Other | (2,283) | (2,631)
Gross deferred tax liability | (55,020) | (38,053)
Net deferred tax liability | (8,230) | (11,845)
Long-term asset | 5,274 | 2,478
Long-term liability | (13,504) | (14,323)
Net deferred tax liability | $ (8,230) | $ (11,845)

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