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Employee Benefit Plans - Summary of plan weighted average asset allocation by asset category along with target allocation for 2017 (Details 6) - Retirement Income Plan | 12 Months Ended |
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Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 100.00% | 100.00%
Cash and Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation for 2017 minimum percentage | 0.00% |
Target Allocation for 2017 maximum percentage | 5.00% |
Percentage of Plan Assets | 3.30% | 0.70%
Debt Securities - Core Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation for 2017 minimum percentage | 15.00% |
Target Allocation for 2017 maximum percentage | 50.00% |
Percentage of Plan Assets | 25.30% | 25.80%
Domestic Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation for 2017 minimum percentage | 0.00% |
Target Allocation for 2017 maximum percentage | 40.00% |
Percentage of Plan Assets | 25.50% | 27.60%
International Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation for 2017 minimum percentage | 0.00% |
Target Allocation for 2017 maximum percentage | 40.00% |
Percentage of Plan Assets | 20.80% | 19.10%
Investments measured at net asset value |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation for 2017 minimum percentage | 0.00% |
Target Allocation for 2017 maximum percentage | 20.00% |
Percentage of Plan Assets | 25.10% | 26.80%

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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=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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