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Income Taxes (Schedule Of Significant Changes To Unrecognized Tax Benefits) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Taxes [Abstract]      
Balance at January 1, $ 1,348 $ 1,123 $ 1,069
Unrecognized tax benefits due to positions taken in current year 234 453 268
Decrease due to expiration of statute of limitations (259) (228) (214)
Balance at December 31, $ 1,323 $ 1,348 $ 1,123