Employee Benefit Plans (Schedule Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Service cost	$ 1,317	$ 1,090	$ 1,295
Interest cost	1,945	2,257	2,056
Expected return on plan assets	(4,114)	(3,511)	(3,727)
Amortization of net loss	1,021	1,197	1,228
Total	$ 169	$ 1,033	$ 852