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Income Taxes (Components Of Net Deferred Income Tax Assets And Net Deferred Income Tax Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Income Taxes [Abstract] |  |
Intangibles | $ 24,232 | $ 40,014
Stock options and restricted stock awards | 5,988 | 14,384
Reserves and allowances | 11,308 | 20,022
Net operating loss carryforwards | 35,004 | 29,398
Tax credit carryforwards | 10,908 | 13,571
Accrued liabilities | 3,011 | 5,330
Deferred revenue | 4,629 | 3,502
Valuation allowance | (80,796) | (109,913)
Total deferred income tax assets | 14,284 | 16,308
Intangibles | 11,301 | 16,968
Property, plant and equipment | 7,304 | 8,818
Other | 642 |
Total deferred income tax liabilities | 19,247 | 25,786
Net deferred income tax liabilities | $ (4,963) | $ (9,478)

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