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Employee Benefit Plans (Schedule Of Assumptions Used To Develop Periodic Expense) (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Retirement Benefits [Abstract]      
Discount rate 3.50% 4.01% 4.11%
Salary scale increases 3.50% 3.50% 3.50%
Long-term rate of return on assets 7.00% 7.00% 7.00%