Employee Benefit Plans (Schedule Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
Service cost	$ 1,090	$ 1,295	$ 1,223
Interest cost	2,257	2,056	2,123
Expected return on plan assets	(3,511)	(3,727)	(3,215)
Amortization of net loss	1,197	1,228	1,475
Total	$ 1,033	$ 852	$ 1,606