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Employee Benefit Plans - Investment of Plan Assets (Details) - Pension | 12 Months Ended |
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Dec. 31, 2016 | Dec. 31, 2015
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% | 40.00%
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |
Target allocation range minimum, percent | 35.00% |
Target allocation range maximum, percent | 45.00% |
International equity securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 25.00% | 25.00%
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |
Target allocation range minimum, percent | 20.00% |
Target allocation range maximum, percent | 30.00% |
Domestic fixed income securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 26.00% | 27.00%
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |
Target allocation range minimum, percent | 25.00% |
Target allocation range maximum, percent | 29.00% |
International fixed income securities |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 5.00% | 5.00%
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |
Target allocation range minimum, percent | 3.00% |
Target allocation range maximum, percent | 7.00% |
Real estate fund |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |
Percentage of Plan Assets | 3.00% | 3.00%
Defined Benefit Plan, Assets, Target Allocations [Abstract] |  |
Target allocation range minimum, percent | 2.00% |
Target allocation range maximum, percent | 4.00% |

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- Definition Target allocation maximum percentage 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=58740216&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=58740216&loc=d3e1928-114920 + Details
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- Definition Target allocation minimum percentage 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 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: 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=58740216&loc=d3e2446-114920 + 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=58740216&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=58740216&loc=d3e1928-114920 + Details
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