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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010
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Income Taxes [Abstract] |  |
Carrying value of inventories | $ 2,240 | $ 1,816
Accrued liabilities and allowances deductible for tax purposes on a cash basis | 5,367 | 7,043
Goodwill | 14,397 | 18,179
Stock-based compensation | 7,398 | 6,466
Net operating loss carryforwards | 49,561 | 46,829
Tax credit carryforwards | 5,400 | 4,464
Other | 9,850 | 11,398
Gross deferred tax assets | 94,213 | 96,195
Less: valuation allowance | (42,524) | (61,852)
Net deferred tax assets | 51,689 | 34,343
Plant and equipment, due to differences in depreciation | (4,586) | (4,984)
Other | (1,508) | (1,534)
Gross deferred tax liability | (6,094) | (6,518)
Net deferred tax assets | 45,595 | 27,825
Current deferred tax assets | 8,175 | 3,850
Non-current deferred tax assets | $ 37,420 | $ 23,975

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Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration