Other Income - Net (Schedule Of Other Income - Net) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Other Income - Net [Abstract]
Market value adjustment on assets held in deferred compensation trust	$ 7,256	$ 2,886	$ 5,093	$ 5,094
Interest income	423	173	647	387
Other - net	(4)	(23)	(17)	7
Total other income - net	$ 7,675	$ 3,036	$ 5,723	$ 5,488