Employee Benefit Plans (Components Of The Net Pension Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]
Service cost-benefits earned during the year	$ 621	$ 500	$ 503
Interest cost on projected benefit obligation	3,826	3,944	4,762
Expected return on plan assets	(5,785)	(5,751)	(6,092)
Amortization of Prior Service Cost (Credit)	(271)	(271)	(271)
Amortization of unrecognized net loss	2,313	2,565	2,593
Net periodic pension cost	$ 704	$ 987	$ 1,495