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Benefit Plans (Schedule Of Changes In Fair Value Of Plan Assets) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Benefit Plans [Abstract]    
Balance $ 28 $ 25
Unrealized gain (loss) relating to investments held at the reporting date 3
Purchases, sales, issuances and settlement, net
Balance $ 28 $ 28