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Employee Benefit Plans (Pension Plan's Weighted-average Asset Allocations) (Details) | Dec. 31, 2017 | Dec. 31, 2016
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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 | 12.50% | 27.00%
International Equity [Member] |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |
Weighted average asset allocations | 15.10% | 18.50%
Fixed Income [Member] |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |
Weighted average asset allocations | 71.10% | 52.50%
Money Market |  |
Defined Benefit Plan, Information about Plan Assets [Abstract] |  |
Weighted average asset allocations | 1.30% | 2.00%

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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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