Employee Benefit Plans (Schedule Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Retirement Benefits [Abstract]
Service cost	$ 305	$ 272	$ 578	$ 597
Interest cost	397	564	677	1,039
Expected return on plan assets	(840)	(877)	(1,432)	(1,738)
Amortization of net loss	273	299	570	587
Total	$ 135	$ 258	$ 393	$ 485