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Benefit Plans (Actuarial assumptions used) (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Retirement Benefits [Abstract]      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 4.11% 3.48% 3.96%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate 3.48% 3.96% 4.13%
Actuarial weighted average assumptions used in determining the net periodic pension costs      
Expected long-term return on plan assets 6.00% 6.00% 6.00%