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Employee Benefit Plans (Pension Plan's Weighted-average Asset Allocations) (Details) | Dec. 31, 2016 | Dec. 31, 2015
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Defined Benefit Plan, Information about Plan Assets [Abstract] |  |
Weighted average asset allocations | 100.00% | 100.00%
U.S. Equity [Member] |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |
Weighted average asset allocations | 27.00% | 27.10%
International Equity [Member] |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |
Weighted average asset allocations | 18.50% | 17.70%
Fixed Income [Member] |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |
Weighted average asset allocations | 52.50% | 53.80%
Money Market |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |
Weighted average asset allocations | 2.00% | 1.40%

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