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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
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