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Retirement Plans, Weighted-Average Assumption Used to Determine Benefit Obligation (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2018 | Feb. 14, 2018
Pension Plan [Member] |  |  |  |  |
Weighted-average assumption used to determine benefit obligation at end of year [Abstract] |  |  |  |  |
Discount rate | [1] | 4.40% | 3.70% |  |
Health care cost trend rate [Abstract] |  |  |  |  |
Initial rate |  | 0.00% | 0.00% |  |
Ultimate rate |  | 0.00% | 0.00% |  |
Pension Plan [Member] | Higman [Member] |  |  |  |  |
Weighted-average assumption used to determine benefit obligation at end of year [Abstract] |  |  |  |  |
Discount rate |  | 4.40% |  | 4.02% | 4.13%
SERP [Member] |  |  |  |  |
Weighted-average assumption used to determine benefit obligation at end of year [Abstract] |  |  |  |  |
Discount rate | [1] | 4.40% | 3.70% |  |
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] |  |  |  |  |
Weighted-average assumption used to determine benefit obligation at end of year [Abstract] |  |  |  |  |
Discount rate | [1] | 4.40% | 3.70% |  |
Rate of compensation increase |  | 0.00% | 0.00% |  |
Health care cost trend rate [Abstract] |  |  |  |  |
Initial rate |  | 7.00% | 7.00% |  |
Ultimate rate |  | 5.00% | 5.00% |  |
Years to ultimate |  | 2025 | 2022 |  |
[1] | The discount rate for the Higman pension plan in 2018 was changed from 4.13% as of February 14, 2018 and 4.02% as of March 31, 2018 to 4.40% as of December 31, 2018.

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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