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Employee Benefit Plans (Schedule of Assumptions Used) (Details)	Dec. 31, 2017	Dec. 31, 2016
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rates	3.68%	4.21%
Postretirement Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discount rates	3.65%	4.21%

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