Employee Benefit Plans (Schedule Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Service cost	$ 1,295	$ 1,223	$ 1,277
Interest cost	2,056	2,123	2,078
Expected return on plan assets	(3,727)	(3,215)	(2,971)
Amortization of net loss	1,228	1,475	1,552
Total	$ 852	$ 1,606	$ 1,936