PENSION AND OTHER POSTRETIREMENT PLANS (Schedule of Allocation of Plan Assets) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	60.00%
Weighted Average Expected Long-Term Rate of Return	8.70%
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	40.00%
Weighted Average Expected Long-Term Rate of Return	3.00%
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	100.00%	100.00%
Weighted Average Expected Long-Term Rate of Return	6.50%	7.00%	7.75%
Pension Plans, Defined Benefit [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	63.00%	60.00%
Weighted Average Expected Long-Term Rate of Return	8.69%
Pension Plans, Defined Benefit [Member] | Equity Securities [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	55.00%
Pension Plans, Defined Benefit [Member] | Equity Securities [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	65.00%
Pension Plans, Defined Benefit [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	33.00%	37.00%
Weighted Average Expected Long-Term Rate of Return	3.00%
Pension Plans, Defined Benefit [Member] | Debt Securities [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	35.00%
Pension Plans, Defined Benefit [Member] | Debt Securities [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	45.00%
Pension Plans, Defined Benefit [Member] | Other Debt Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	4.00%	3.00%
Weighted Average Expected Long-Term Rate of Return	0.10%
Pension Plans, Defined Benefit [Member] | Other Debt Obligations [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	5.00%
Pension Plans, Defined Benefit [Member] | Other Debt Obligations [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	10.00%
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	100.00%	100.00%
Weighted Average Expected Long-Term Rate of Return	6.50%	7.00%	7.75%
Supplemental Employee Retirement Plans, Defined Benefit [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	66.00%	62.00%
Weighted Average Expected Long-Term Rate of Return	8.69%
Supplemental Employee Retirement Plans, Defined Benefit [Member] | Equity Securities [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	55.00%
Supplemental Employee Retirement Plans, Defined Benefit [Member] | Equity Securities [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	65.00%
Supplemental Employee Retirement Plans, Defined Benefit [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	32.00%	37.00%
Weighted Average Expected Long-Term Rate of Return	3.00%
Supplemental Employee Retirement Plans, Defined Benefit [Member] | Debt Securities [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	35.00%
Supplemental Employee Retirement Plans, Defined Benefit [Member] | Debt Securities [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	45.00%
Supplemental Employee Retirement Plans, Defined Benefit [Member] | Other Debt Obligations [Member]
Defined Benefit Plan Disclosure [Line Items]
Percentage of Plan Assets	2.00%	1.00%
Weighted Average Expected Long-Term Rate of Return	0.10%
Supplemental Employee Retirement Plans, Defined Benefit [Member] | Other Debt Obligations [Member] | Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	5.00%
Supplemental Employee Retirement Plans, Defined Benefit [Member] | Other Debt Obligations [Member] | Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation	10.00%