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Employee Benefit Plans (Schedule of Assumptions Used) (Details) | Dec. 31, 2017 | Dec. 31, 2016
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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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