Employee Benefit Plans (Schedule Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Retirement Benefits [Abstract]
Service cost	$ 319	$ 278	$ 976	$ 926
Interest cost	666	482	1,505	1,527
Expected return on plan assets	(1,192)	(760)	(2,605)	(2,323)
Amortization of net loss	325	365	903	1,111
Total	$ 118	$ 365	$ 779	$ 1,241