Other Income - Net (Schedule Of Other Income - Net) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Other Income -Net [Abstract]
Market value adjustment on assets held in deferred compensation trust	$ 2,886	$ 2,189	$ 5,094	$ 3,827
Interest income	173	111	387	529
Other - net	(23)		7
Total other income - net	$ 3,036	$ 2,300	$ 5,488	$ 4,356