Employee Benefit Plans (Schedule Of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Retirement Benefits [Abstract]
Service cost	$ 278	$ 309	$ 926	$ 927
Interest cost	482	499	1,527	1,496
Expected return on plan assets	(760)	(600)	(2,323)	(2,058)
Recognized loss	365	251	1,111	1,004
Total	$ 365	$ 459	$ 1,241	$ 1,369