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Income Taxes (Interest And Penalties) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Income Tax Disclosure [Abstract] |  |
Gross liability for unrecognized tax benefits, exclusive of interest and penalties | $ 16,721 | $ 15,911
Interest and penalties on unrecognized benefits | 1,835 | 2,105
Total gross uncertain tax positions | 18,556 | 18,016
Amount included in Current liabilities | 4,497 | 6,546
Amount included in Other long-term liabilities | 14,059 | 11,470
Total gross uncertain tax positions | $ 18,556 | $ 18,016

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