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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Income Tax Disclosure [Abstract] |  |
Carrying value of inventories | $ 3,470 | $ 3,212
Accrued liabilities and allowances deductible for tax purposes on a cash basis | 13,086 | 8,945
Goodwill | 1,704 | 1,976
Stock-based compensation | 2,559 | 2,500
Operating right-of-use lease liabilities | 20,003 | 19,087
Net operating loss carryforwards | 19,120 | 19,493
Tax credit carryforwards | 3,368 | 2,421
Interest rate swap liabilities | 2,263 | 1,210
Other | 5,025 | 3,938
Gross deferred tax assets | 70,598 | 62,782
Less: valuation allowance | (19,038) | (15,992)
Net deferred tax assets | 51,560 | 46,790
Plant and equipment, due to differences in depreciation | (7,899) | (10,428)
Operating right-of-use lease assets | (19,742) | (18,826)
Intangible assets, due to differences in amortization | (14,078) | (16,302)
Foreign withholding tax | (6,102) | (7,181)
Other | (3,603) | (2,283)
Gross deferred tax liability | (51,424) | (55,020)
Net deferred tax liability |  | (8,230)
Long-term asset | 4,924 | 5,274
Long-term liability | (4,788) | $ (13,504)
Net deferred tax Asset | $ 136 |

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