Employee Benefit Plans (Schedule Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Retirement Benefits [Abstract]
Service cost	$ 370	$ 246	$ 948	$ 843
Interest cost	634	499	1,311	1,538
Expected return on plan assets	(1,341)	(776)	(2,773)	(2,514)
Amortization of net loss	225	305	795	892
Total	$ (112)	$ 274	$ 281	$ 759