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Employee Benefit Plans (Schedule of Allocation of Plan Assets) (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Pension Benefit Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allocation of plan assets | 100.00% | 100.00%
Pension Benefit Plan [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allocation of plan assets | 59.70% | 59.10%
Target plan allocations | 55.00% |
Pension Benefit Plan [Member] | Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allocation of plan assets | 36.60% | 37.80%
Target plan allocations | 38.00% |
Pension Benefit Plan [Member] | Cash [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allocation of plan assets | 1.00% | 1.30%
Target plan allocations | 2.00% |
Pension Benefit Plan [Member] | Commodities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allocation of plan assets | 2.70% | 1.80%
Target plan allocations | 5.00% |
Other Benefits Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allocation of plan assets | 100.00% | 100.00%
Other Benefits Plan [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allocation of plan assets | 54.10% | 50.00%
Target plan allocations | 43.00% |
Other Benefits Plan [Member] | Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allocation of plan assets | 43.30% | 47.40%
Target plan allocations | 50.00% |
Other Benefits Plan [Member] | Cash [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allocation of plan assets | 2.60% | 2.40%
Target plan allocations | 2.00% |
Other Benefits Plan [Member] | Commodities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allocation of plan assets | 0.00% | 0.20%
Target plan allocations | 5.00% |

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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + 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)(i) -URI http://asc.fasb.org/extlink&oid=65897934&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)(i) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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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=65897934&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=65897934&loc=d3e1928-114920 + Details
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