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Benefit Plans (Schedule Of Changes In Fair Value Of Plan Assets) (Details) - Cash Value Of Life Insurance [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Balance $ 25 $ 25
Unrealized gain (loss) relating to investments held at the reporting date
Purchases, sales, issuances and settlement, net
Balance $ 25 $ 25