EMPLOYEE BENEFIT PLANS Table 9 - Assumptions - Net Periodic Benefit Cost (Income) (Details) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Pension Plans (The Pension Plan, Excess Pension Plan and SERP) [Member] | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Discount rate | 4.33% | 4.61% | 4.22% |
| Expected long-term rate of return on plan assets | 6.00% | 6.25% | 6.50% |
| Rate of compensation increase | 3.51% | 3.51% | 3.51% |
| Other Postretirement Benefits Plan [Member] | |||
| Defined Benefit Plan Disclosure [Line Items] | |||
| Discount rate | 4.49% | 4.75% | 4.34% |