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Pension and Other Benefits (Details) - Schedule of Allocation of Plan Assets | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Equity Securities |  |
% of Plan Assets | 100.00% | 100.00%
Weighted Average Expected Long-Term Rate of Return | 5.50% | 5.50%
Domestic Equity Securities [Member] |  |
Equity Securities |  |
Target Allocation | 42.00% | 42.00%
% of Plan Assets | 41.00% | 44.00%
Weighted Average Expected Long-Term Rate of Return | 3.20% | 3.20%
International Equity Securities [Member] |  |
Equity Securities |  |
Target Allocation | 10.00% | 10.00%
% of Plan Assets | 8.00% | 8.00%
Weighted Average Expected Long-Term Rate of Return | 0.70% | 0.70%
Debt And Fixed Income Securities [Member] |  |
Equity Securities |  |
Target Allocation | 46.00% | 46.00%
% of Plan Assets | 49.00% | 47.00%
Weighted Average Expected Long-Term Rate of Return | 1.60% | 1.60%
Cash And Other Alternative Investments [Member] |  |
Equity Securities |  |
Target Allocation | 2.00% | 2.00%
% of Plan Assets | 2.00% | 1.00%
Weighted Average Expected Long-Term Rate of Return | 0.00% | 0.00%

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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(i) -URI http://asc.fasb.org/extlink&oid=82843861&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=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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