Retirement Plans and Related Post Retirement Benefits - Assumptions Used to Determine the Net Periodic Cost (Details) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| SERP | |||
| Defined Benefit Plan Disclosure | |||
| Discount Rate | 3.60% | 4.20% | 4.45% |
| SERP Medical | |||
| Defined Benefit Plan Disclosure | |||
| Discount Rate | 3.60% | 4.20% | 4.45% |
| Future Average Compensation Increases | 5.38% | 5.50% | 5.72% |
| SERP Medical | Minimum | |||
| Defined Benefit Plan Disclosure | |||
| Future Average Compensation Increases | 2.00% | 3.00% | 3.00% |
| SERP Medical | Maximum | |||
| Defined Benefit Plan Disclosure | |||
| Future Average Compensation Increases | 3.00% | 5.00% | 5.00% |
| X | ||||||||||
- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Weighted average rate of compensation increase used to determine net periodic benefit cost of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- 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. No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|