Employee Benefit Plans (Schedule Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Retirement Benefits [Abstract]
Service cost	$ 324	$ 305	$ 657	$ 648
Interest cost	514	531	839	1,045
Expected return on plan assets	(921)	(804)	(1,413)	(1,563)
Amortization of net loss	307	369	578	746
Total	$ 224	$ 401	$ 661	$ 876