Employee Benefit Plans (Schedule Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Retirement Benefits [Abstract]
Service cost	$ 272	$ 324	$ 597	$ 657
Interest cost	564	514	1,039	839
Expected return on plan assets	(877)	(921)	(1,738)	(1,413)
Amortization of net loss	299	307	587	578
Total	$ 258	$ 224	$ 485	$ 661