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Employee Benefit Plans (Actuarial Assumptions Used, Projected Benefit Obligation) (Details)
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Employee Benefit Plans [Abstract]      
Weighted average discount rate 3.49% 4.00% 4.21%
Rate of compensation increase 3.00% 3.00% 3.00%