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Employee Benefit Plans - Summary of plan weighted average asset allocation by asset category along with target allocation for 2019 (Details 6) - Retirement Income Plan | Dec. 31, 2018 | Dec. 31, 2017
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Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 100.00% | 100.00%
Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 3.00% | 2.80%
Cash and cash equivalents | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation for 2019 minimum percentage | 0.00% |
Cash and cash equivalents | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation for 2019 minimum percentage | 3.00% |
Fixed income securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 29.10% | 20.70%
Fixed income securities | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation for 2019 minimum percentage | 15.00% |
Fixed income securities | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation for 2019 minimum percentage | 100.00% |
Domestic Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 39.50% | 23.80%
Domestic Equity Securities | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation for 2019 minimum percentage | 0.00% |
Domestic Equity Securities | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation for 2019 minimum percentage | 40.00% |
International Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 19.00% | 42.40%
International Equity Securities | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation for 2019 minimum percentage | 0.00% |
International Equity Securities | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation for 2019 minimum percentage | 30.00% |
Investments measured at net asset value |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Percentage of Plan Assets | 9.40% | 10.30%
Investments measured at net asset value | Minimum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation for 2019 minimum percentage | 0.00% |
Investments measured at net asset value | Maximum |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation for 2019 minimum percentage | 12.00% |

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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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Percentage of actual 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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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