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Employee Benefit Plans - Investment of Plan Assets (Details) - Pension | Dec. 31, 2017 | Dec. 31, 2016
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 100.00% | 100.00%
Domestic equity securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 41.00% | 41.00%
International equity securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 26.00% | 25.00%
Domestic fixed income securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 26.00% | 26.00%
International fixed income securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 4.00% | 5.00%
Real estate fund |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 3.00% | 3.00%
Minimum | Domestic equity securities |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |
Target allocation range minimum, percent | 35.00% |
Minimum | International equity securities |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |
Target allocation range minimum, percent | 20.00% |
Minimum | Domestic fixed income securities |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |
Target allocation range minimum, percent | 25.00% |
Minimum | International fixed income securities |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |
Target allocation range minimum, percent | 3.00% |
Minimum | Real estate fund |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |
Target allocation range minimum, percent | 2.00% |
Maximum | Domestic equity securities |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |
Target allocation range minimum, percent | 45.00% |
Maximum | International equity securities |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |
Target allocation range minimum, percent | 30.00% |
Maximum | Domestic fixed income securities |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |
Target allocation range minimum, percent | 29.00% |
Maximum | International fixed income securities |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |
Target allocation range minimum, percent | 7.00% |
Maximum | Real estate fund |  |
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |
Target allocation range minimum, percent | 4.00% |

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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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