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Employee Benefit Plans - Summary of plan weighted average asset allocation by asset category along with target allocation for 2016 (Details 6) - Retirement Income Plan | 12 Months Ended |
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Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation for 2016 total percentage | 100.00% |
Percentage of Plan Assets | 100.00% | 100.00%
Cash and Cash Equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation for 2016 minimum percentage | 0.00% |
Target Allocation for 2016 maximum percentage | 5.00% |
Percentage of Plan Assets | 0.70% | 1.00%
Debt Securities - Core Fixed Income |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation for 2016 minimum percentage | 15.00% |
Target Allocation for 2016 maximum percentage | 50.00% |
Percentage of Plan Assets | 25.80% | 24.30%
Domestic Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation for 2016 minimum percentage | 0.00% |
Target Allocation for 2016 maximum percentage | 40.00% |
Percentage of Plan Assets | 38.50% | 37.00%
International Equity Securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation for 2016 minimum percentage | 0.00% |
Target Allocation for 2016 maximum percentage | 30.00% |
Percentage of Plan Assets | 23.20% | 22.80%
Real Estate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation for 2016 minimum percentage | 0.00% |
Target Allocation for 2016 maximum percentage | 20.00% |
Percentage of Plan Assets | 7.20% | 10.50%
Real Return |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation for 2016 minimum percentage | 0.00% |
Target Allocation for 2016 maximum percentage | 20.00% |
Percentage of Plan Assets |  | 1.60%
Alternative/Opportunistic/Special funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Target Allocation for 2016 minimum percentage | 0.00% |
Target Allocation for 2016 maximum percentage | 20.00% |
Percentage of Plan Assets | 4.60% | 2.80%

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