Employee Benefit Plans (Schedule Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Retirement Benefits [Abstract]
Service cost	$ 246	$ 319	$ 843	$ 976
Interest cost	499	666	1,538	1,505
Expected return on plan assets	(776)	(1,192)	(2,514)	(2,605)
Amortization of net loss	305	325	892	903
Total	$ 274	$ 118	$ 759	$ 779