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Employee Benefit Plans (Schedule Of Weighted Average Assumptions Used To Determine The Benefit Obligation And The Net Periodic Cost) (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Pension Plans And Other Postretirement Benefits [Abstract]    
Discount rate, benefit obligation 3.43% 3.90%
Discount rate, net periodic pension cost 3.90% 3.18%
Expected long-term return on plan assets 6.50% 6.50%
Rate of compensation increase 0.00% 0.00%