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Income Taxes (Schedule Of Unrecognized Tax Benefits) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Taxes [Abstract]    
Beginning balance $ 4,400 $ 4,400
Additions based on tax positions related to the current year 100
Ending Balance $ 4,500 $ 4,400