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Income Taxes (Schedule Of Valuation Allowance Activity) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Balance at beginning of year $ 13,736 $ 58,446
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction (980) (14,548)
Changes attributable to write-off of underlying assets 17 (30,138)
Translation adjustment   (24)
Balance at end of year $ 12,773 $ 13,736