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Employee Benefit Plans (Schedule of Assumptions used to Determine the Projected Benefit Obligation) (Details) - Defined Benefit Plan [Member]
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]      
Weighted average discount rate 3.75% 4.25% 4.50%
Rate of increase in compensation levels [1]
[1] 6.0% graded down to 3.25% over the first seven years of service