Employee Benefit Plans (Schedule Of Net Periodic Benefit Income And Weighted Average Assumptions) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan [Abstract]
Interest cost	$ 4,815	$ 5,016	$ 6,113
Expected return on plan assets	(8,782)	(8,189)	(9,124)
Amortization of net actuarial pension loss	2,963	3,815	1,951
Net periodic benefit income (loss)	$ (1,004)	$ 642	$ (1,060)
Discount rate	3.00%	2.60%	2.70%
Expected return on plan assets, percent	4.50%	4.50%	4.50%
Rate of compensation increase	3.00%	3.00%	3.00%