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Retirement Plans, Summary of Asset Allocation (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 100.00% | 100.00%
U.S. Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 51.00% | 50.00%
Target allocations, minimum | 30.00% |
Target allocations | 50.00% |
Target allocations, maximum | 70.00% |
International Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 19.00% | 18.00%
Target allocations, minimum | 0.00% |
Target allocations | 20.00% |
Target allocations, maximum | 30.00% |
Debt Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 30.00% | 28.00%
Target allocations, minimum | 15.00% |
Target allocations | 30.00% |
Target allocations, maximum | 55.00% |
Cash And Cash Equivalents [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Asset allocations | 0.00% | 4.00%
Target allocations, minimum | 0.00% |
Target allocations | 0.00% |
Target allocations, maximum | 5.00% |

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