Employee Benefit Plans (Schedule Of Assumptions Used To Develop The Actuarial Present Value Of The Benefit Obligations) (Details)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Retirement Benefits [Abstract]
Discount rate	3.50%	4.01%	4.11%
Salary scale increases	3.50%	3.50%	3.50%