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Retirement Plans, Weighted-Average Assumption Used to Determine Benefit Obligation (Details) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Pension Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rate | 4.20% | 4.50%
Health care cost trend rate [Abstract] |  |
Initial rate | 0.00% | 0.00%
Ultimate rate | 0.00% | 0.00%
SERP [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rate | 4.20% | 4.50%
Rate of compensation increase | 0.00% | 0.00%
Health care cost trend rate [Abstract] |  |
Initial rate | 0.00% | 0.00%
Ultimate rate | 0.00% | 0.00%
Other Postretirement Benefits [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Discount rate | 4.20% | 4.50%
Rate of compensation increase | 0.00% | 0.00%
Health care cost trend rate [Abstract] |  |
Initial rate | 7.00% | 6.50%
Ultimate rate | 5.00% | 5.00%
Years to ultimate | 2021 | 2019

X
- Definition Defined Benefit Plan, Initial Health Care Cost Trend Rate + References No definition available. + Details
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- References No definition available. + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The ultimate trend rate for health care costs. + 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 (l) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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- Definition Year the ultimate health care cost trend rate is expected to be reached, in CCYY format. + 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 (l) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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