Income Taxes (Schedule Of Roll Forward Of Valuation Allowance For Deferred Income Tax Assets) (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
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| Income Taxes [Abstract] | |||
| Valuation Allowance, Balance at beginning of period | $ 28,632 | $ 42,122 | $ 45,811 |
| Charged (Credited) to Costs and Expenses | (6,284) | (13,473) | (3,486) |
| Other Adjustments | (17) | (203) | |
| Valuation Allowance, Balance at end of period | $ 22,348 | $ 28,632 | $ 42,122 |
| X | ||||||||||
- Definition Deferred Tax Assets Valuation Allowance, Charged (Credited) To Costs And Expenses No definition available.
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| X | ||||||||||
- Definition Deferred Tax Assets, Valuation Allowance, Other Adjustments No definition available.
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| X | ||||||||||
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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